diff --git a/sim/aarch64/ChangeLog b/sim/aarch64/ChangeLog
index ea7208d..ebae1cd 100644
--- a/sim/aarch64/ChangeLog
+++ b/sim/aarch64/ChangeLog
@@ -2,6 +2,10 @@
 
 	* configure: Regenerate.
 
+2016-01-10  Mike Frysinger  <vapier@gentoo.org>
+
+	* configure: Regenerate.
+
 2016-01-09  Mike Frysinger  <vapier@gentoo.org>
 
 	* config.in, configure: Regenerate.
diff --git a/sim/aarch64/configure b/sim/aarch64/configure
index d92fd06..d733a5b 100755
diff --git a/sim/arm/ChangeLog b/sim/arm/ChangeLog
index c92ad02..e80bff5 100644
--- a/sim/arm/ChangeLog
+++ b/sim/arm/ChangeLog
@@ -2,6 +2,10 @@
 
 	* configure: Regenerate.
 
+2016-01-10  Mike Frysinger  <vapier@gentoo.org>
+
+	* configure: Regenerate.
+
 2016-01-09  Mike Frysinger  <vapier@gentoo.org>
 
 	* config.in, configure: Regenerate.
diff --git a/sim/arm/configure b/sim/arm/configure
index 027cd01..7e68943 100755
diff --git a/sim/avr/ChangeLog b/sim/avr/ChangeLog
index ae5250b..44538f2 100644
--- a/sim/avr/ChangeLog
+++ b/sim/avr/ChangeLog
@@ -2,6 +2,10 @@
 
 	* configure: Regenerate.
 
+2016-01-10  Mike Frysinger  <vapier@gentoo.org>
+
+	* configure: Regenerate.
+
 2016-01-09  Mike Frysinger  <vapier@gentoo.org>
 
 	* config.in, configure: Regenerate.
diff --git a/sim/avr/configure b/sim/avr/configure
index 70910ca..b9b9b53 100755
diff --git a/sim/bfin/ChangeLog b/sim/bfin/ChangeLog
index 356d9ca..723bfcb 100644
--- a/sim/bfin/ChangeLog
+++ b/sim/bfin/ChangeLog
@@ -2,6 +2,10 @@
 
 	* configure: Regenerate.
 
+2016-01-10  Mike Frysinger  <vapier@gentoo.org>
+
+	* configure: Regenerate.
+
 2016-01-09  Mike Frysinger  <vapier@gentoo.org>
 
 	* config.in, configure: Regenerate.
diff --git a/sim/bfin/configure b/sim/bfin/configure
index 3fc5195..e95b232 100755
diff --git a/sim/common/ChangeLog b/sim/common/ChangeLog
index 27ca374..6f4f916 100644
--- a/sim/common/ChangeLog
+++ b/sim/common/ChangeLog
@@ -1,5 +1,16 @@
 2016-01-10  Mike Frysinger  <vapier@gentoo.org>
 
+	* acinclude.m4: Delete --enable-sim-regparm and sim_regparm,
+	and --enable-sim-stdcall and sim_stdcall.
+	* configure: Regenerate.
+	* Make-common.in (SIM_REGPARM, SIM_STDCALL): Delete.
+	(CONFIG_CFLAGS): Delete $(SIM_REGPARM) and $(SIM_STDCALL).
+	* sim-config.h (WITH_REGPARM, WITH_STDCALL): Delete.
+	* sim-inline.h (REGPARM_MODULE, REGPARM): Delete.
+	(REGPARM_*): Delete all regparm defines and their use.
+
+2016-01-10  Mike Frysinger  <vapier@gentoo.org>
+
 	* acinclude.m4: Delete --enable-sim-cflags and sim_cflags.
 	* Make-common.in (SIM_CFLAGS): Delete.
 	(CONFIG_CFLAGS): Delete $(SIM_CFLAGS).
diff --git a/sim/common/Make-common.in b/sim/common/Make-common.in
index a90d3d8..458bf4b 100644
--- a/sim/common/Make-common.in
+++ b/sim/common/Make-common.in
@@ -91,11 +91,9 @@ SIM_HW_OBJS = @sim_hw_objs@
 SIM_HW = @sim_hw@
 SIM_INLINE = @sim_inline@
 SIM_PACKAGES = @sim_packages@
-SIM_REGPARM = @sim_regparm@
 SIM_RESERVED_BITS = @sim_reserved_bits@
 SIM_SCACHE = @sim_scache@
 SIM_SMP = @sim_smp@
-SIM_STDCALL = @sim_stdcall@
 SIM_XOR_ENDIAN = @sim_xor_endian@
 WARN_CFLAGS = @WARN_CFLAGS@
 WERROR_CFLAGS = @WERROR_CFLAGS@
@@ -240,11 +238,9 @@ CONFIG_CFLAGS = \
 	$(SIM_HW_CFLAGS) \
 	$(SIM_INLINE) \
 	$(SIM_PACKAGES) \
-	$(SIM_REGPARM) \
 	$(SIM_RESERVED_BITS) \
 	$(SIM_SCACHE) \
 	$(SIM_SMP) \
-	$(SIM_STDCALL) \
 	$(SIM_WARN_CFLAGS) \
 	$(SIM_WERROR_CFLAGS) \
 	$(SIM_XOR_ENDIAN) \
diff --git a/sim/common/acinclude.m4 b/sim/common/acinclude.m4
index e11e568..92eb265 100644
--- a/sim/common/acinclude.m4
+++ b/sim/common/acinclude.m4
@@ -694,24 +694,6 @@ fi])dnl
 AC_SUBST(sim_packages)
 
 
-AC_DEFUN([SIM_AC_OPTION_REGPARM],
-[
-AC_ARG_ENABLE(sim-regparm,
-[AS_HELP_STRING([--enable-sim-regparm=nr-parm],
-		[Pass parameters in registers instead of on the stack - x86/GCC specific])],
-[case "${enableval}" in
-  0*|1*|2*|3*|4*|5*|6*|7*|8*|9*) sim_regparm="-DWITH_REGPARM=${enableval}";;
-  no)                            sim_regparm="" ;;
-  yes)                           sim_regparm="-DWITH_REGPARM=3";;
-  *)   AC_MSG_ERROR("Unknown value $enableval for --enable-sim-regparm"); sim_regparm="";;
-esac
-if test x"$silent" != x"yes" && test x"$sim_regparm" != x""; then
-  echo "Setting regparm flags = $sim_regparm" 6>&1
-fi],[sim_regparm=""])dnl
-])
-AC_SUBST(sim_regparm)
-
-
 AC_DEFUN([SIM_AC_OPTION_RESERVED_BITS],
 [
 default_sim_reserved_bits="ifelse([$1],,1,[$1])"
@@ -751,24 +733,6 @@ fi])dnl
 AC_SUBST(sim_smp)
 
 
-AC_DEFUN([SIM_AC_OPTION_STDCALL],
-[
-AC_ARG_ENABLE(sim-stdcall,
-[AS_HELP_STRING([--enable-sim-stdcall=type],
-		[Use an alternative function call/return mechanism - x86/GCC specific])],
-[case "${enableval}" in
-  no)		sim_stdcall="" ;;
-  std*)		sim_stdcall="-DWITH_STDCALL=1";;
-  yes)		sim_stdcall="-DWITH_STDCALL=1";;
-  *)   AC_MSG_ERROR("Unknown value $enableval for --enable-sim-stdcall"); sim_stdcall="";;
-esac
-if test x"$silent" != x"yes" && test x"$sim_stdcall" != x""; then
-  echo "Setting function call flags = $sim_stdcall" 6>&1
-fi],[sim_stdcall=""])dnl
-])
-AC_SUBST(sim_stdcall)
-
-
 AC_DEFUN([SIM_AC_OPTION_XOR_ENDIAN],
 [
 default_sim_xor_endian="ifelse([$1],,8,[$1])"
diff --git a/sim/common/configure b/sim/common/configure
index 3b11fbb..ccb6ce5 100755
diff --git a/sim/common/sim-config.h b/sim/common/sim-config.h
index 4bfcdc9..1c65365 100644
--- a/sim/common/sim-config.h
+++ b/sim/common/sim-config.h
@@ -355,20 +355,6 @@ extern int current_stdio;
 
 
 
-/* Specify that configured calls pass parameters in registers when the
-   convention is that they are placed on the stack */
-
-#ifndef WITH_REGPARM
-#define WITH_REGPARM                   0
-#endif
-
-/* Specify that configured calls use an alternative calling mechanism */
-
-#ifndef WITH_STDCALL
-#define WITH_STDCALL                   0
-#endif
-
-
 /* Set the default state configuration, before parsing argv.  */
 
 extern void sim_config_default (SIM_DESC sd);
diff --git a/sim/common/sim-inline.h b/sim/common/sim-inline.h
index ed7451c..2c5406e 100644
--- a/sim/common/sim-inline.h
+++ b/sim/common/sim-inline.h
@@ -266,8 +266,6 @@
 #define INLINE_GLOBALS			4
 #define INLINE_LOCALS			8
 
-#define REGPARM_MODULE                 32
-
 #define ALL_H_INLINE (H_REVEALS_MODULE | INLINE_GLOBALS | INLINE_LOCALS)
 #define ALL_C_INLINE (C_REVEALS_MODULE | INLINE_GLOBALS | INLINE_LOCALS)
 
@@ -349,30 +347,6 @@
 
 
 
-
-/* Your compilers nonstandard function call mechanism prefix */
-
-#if !defined REGPARM
-#if defined (__GNUC__) && (defined (__i386__) || defined (__i486__) || defined (__i586__) || defined (__i686__))
-#if (WITH_REGPARM && WITH_STDCALL)
-#define REGPARM __attribute__((__regparm__(WITH_REGPARM),__stdcall__))
-#else
-#if (WITH_REGPARM && !WITH_STDCALL)
-#define REGPARM __attribute__((__regparm__(WITH_REGPARM)))
-#else
-#if (!WITH_REGPARM && WITH_STDCALL)
-#define REGPARM __attribute__((__stdcall__))
-#endif
-#endif
-#endif
-#endif
-#endif
-
-#if !defined REGPARM
-#define REGPARM
-#endif
-
-
 
 /* *****
    sim-bits and sim-endian are treated differently from the rest
@@ -387,12 +361,6 @@
 # define SIM_BITS_INLINE (ALL_H_INLINE)
 #endif
 
-#if (SIM_BITS_INLINE & REGPARM_MODULE)
-# define REGPARM_SIM_BITS REGPARM
-#else
-# define REGPARM_SIM_BITS
-#endif
-
 #if ((H_REVEALS_MODULE_P (SIM_BITS_INLINE) || defined (SIM_INLINE_C)) \
      && !defined (SIM_BITS_C) \
      && (REVEAL_MODULE_P (SIM_BITS_INLINE)))
@@ -400,18 +368,18 @@
 #  define INLINE_SIM_BITS(TYPE) static INLINE TYPE UNUSED
 #  define EXTERN_SIM_BITS_P 0
 # else
-#  define INLINE_SIM_BITS(TYPE) static TYPE UNUSED REGPARM_SIM_BITS
+#  define INLINE_SIM_BITS(TYPE) static TYPE UNUSED
 #  define EXTERN_SIM_BITS_P 0
 # endif
 #else
-# define INLINE_SIM_BITS(TYPE) TYPE REGPARM_SIM_BITS
+# define INLINE_SIM_BITS(TYPE) TYPE
 # define EXTERN_SIM_BITS_P 1
 #endif
 
 #if (SIM_BITS_INLINE & INLINE_LOCALS)
 # define STATIC_INLINE_SIM_BITS(TYPE) static INLINE TYPE
 #else
-# define STATIC_INLINE_SIM_BITS(TYPE) static TYPE REGPARM_SIM_BITS
+# define STATIC_INLINE_SIM_BITS(TYPE) static TYPE
 #endif
 
 #define STATIC_SIM_BITS(TYPE) static TYPE
@@ -424,12 +392,6 @@
 # define SIM_CORE_INLINE ALL_C_INLINE
 #endif
 
-#if (SIM_CORE_INLINE & REGPARM_MODULE)
-# define REGPARM_SIM_CORE REGPARM
-#else
-# define REGPARM_SIM_CORE
-#endif
-
 #if ((H_REVEALS_MODULE_P (SIM_CORE_INLINE) || defined (SIM_INLINE_C)) \
      && !defined (SIM_CORE_C) \
      && (REVEAL_MODULE_P (SIM_CORE_INLINE)))
@@ -437,18 +399,18 @@
 #  define INLINE_SIM_CORE(TYPE) static INLINE TYPE UNUSED
 #  define EXTERN_SIM_CORE_P 0
 #else
-#  define INLINE_SIM_CORE(TYPE) static TYPE UNUSED REGPARM_SIM_CORE
+#  define INLINE_SIM_CORE(TYPE) static TYPE UNUSED
 #  define EXTERN_SIM_CORE_P 0
 #endif
 #else
-# define INLINE_SIM_CORE(TYPE) TYPE REGPARM_SIM_CORE
+# define INLINE_SIM_CORE(TYPE) TYPE
 # define EXTERN_SIM_CORE_P 1
 #endif
 
 #if (SIM_CORE_INLINE & INLINE_LOCALS)
 # define STATIC_INLINE_SIM_CORE(TYPE) static INLINE TYPE
 #else
-# define STATIC_INLINE_SIM_CORE(TYPE) static TYPE REGPARM_SIM_CORE
+# define STATIC_INLINE_SIM_CORE(TYPE) static TYPE
 #endif
 
 #define STATIC_SIM_CORE(TYPE) static TYPE
@@ -461,12 +423,6 @@
 # define SIM_ENDIAN_INLINE ALL_H_INLINE
 #endif
 
-#if (SIM_ENDIAN_INLINE & REGPARM_MODULE)
-# define REGPARM_SIM_ENDIAN REGPARM
-#else
-# define REGPARM_SIM_ENDIAN
-#endif
-
 #if ((H_REVEALS_MODULE_P (SIM_ENDIAN_INLINE) || defined (SIM_INLINE_C)) \
      && !defined (SIM_ENDIAN_C) \
      && (REVEAL_MODULE_P (SIM_ENDIAN_INLINE)))
@@ -474,18 +430,18 @@
 #  define INLINE_SIM_ENDIAN(TYPE) static INLINE TYPE UNUSED
 #  define EXTERN_SIM_ENDIAN_P 0
 # else
-#  define INLINE_SIM_ENDIAN(TYPE) static TYPE UNUSED REGPARM_SIM_ENDIAN
+#  define INLINE_SIM_ENDIAN(TYPE) static TYPE UNUSED
 #  define EXTERN_SIM_ENDIAN_P 0
 # endif
 #else
-# define INLINE_SIM_ENDIAN(TYPE) TYPE REGPARM_SIM_ENDIAN
+# define INLINE_SIM_ENDIAN(TYPE) TYPE
 # define EXTERN_SIM_ENDIAN_P 1
 #endif
 
 #if (SIM_ENDIAN_INLINE & INLINE_LOCALS)
 # define STATIC_INLINE_SIM_ENDIAN(TYPE) static INLINE TYPE
 #else
-# define STATIC_INLINE_SIM_ENDIAN(TYPE) static TYPE REGPARM_SIM_ENDIAN
+# define STATIC_INLINE_SIM_ENDIAN(TYPE) static TYPE
 #endif
 
 #define STATIC_SIM_ENDIAN(TYPE) static TYPE
@@ -498,12 +454,6 @@
 # define SIM_EVENTS_INLINE ALL_C_INLINE
 #endif
 
-#if (SIM_EVENTS_INLINE & REGPARM_MODULE)
-# define REGPARM_SIM_EVENTS REGPARM
-#else
-# define REGPARM_SIM_EVENTS
-#endif
-
 #if ((H_REVEALS_MODULE_P (SIM_EVENTS_INLINE) || defined (SIM_INLINE_C)) \
      && !defined (SIM_EVENTS_C) \
      && (REVEAL_MODULE_P (SIM_EVENTS_INLINE)))
@@ -511,18 +461,18 @@
 #  define INLINE_SIM_EVENTS(TYPE) static INLINE TYPE UNUSED
 #  define EXTERN_SIM_EVENTS_P 0
 # else
-#  define INLINE_SIM_EVENTS(TYPE) static TYPE UNUSED REGPARM_SIM_EVENTS
+#  define INLINE_SIM_EVENTS(TYPE) static TYPE UNUSED
 #  define EXTERN_SIM_EVENTS_P 0
 # endif
 #else
-# define INLINE_SIM_EVENTS(TYPE) TYPE REGPARM_SIM_EVENTS
+# define INLINE_SIM_EVENTS(TYPE) TYPE
 # define EXTERN_SIM_EVENTS_P 1
 #endif
 
 #if (SIM_EVENTS_INLINE & INLINE_LOCALS)
 # define STATIC_INLINE_SIM_EVENTS(TYPE) static INLINE TYPE
 #else
-# define STATIC_INLINE_SIM_EVENTS(TYPE) static TYPE REGPARM_SIM_EVENTS
+# define STATIC_INLINE_SIM_EVENTS(TYPE) static TYPE
 #endif
 
 #define STATIC_SIM_EVENTS(TYPE) static TYPE
@@ -535,12 +485,6 @@
 # define SIM_FPU_INLINE ALL_C_INLINE
 #endif
 
-#if (SIM_FPU_INLINE & REGPARM_MODULE)
-# define REGPARM_SIM_FPU REGPARM
-#else
-# define REGPARM_SIM_FPU
-#endif
-
 #if ((H_REVEALS_MODULE_P (SIM_FPU_INLINE) || defined (SIM_INLINE_C)) \
      && !defined (SIM_FPU_C) \
      && (REVEAL_MODULE_P (SIM_FPU_INLINE)))
@@ -548,18 +492,18 @@
 #  define INLINE_SIM_FPU(TYPE) static INLINE TYPE UNUSED
 #  define EXTERN_SIM_FPU_P 0
 # else
-#  define INLINE_SIM_FPU(TYPE) static TYPE UNUSED REGPARM_SIM_FPU
+#  define INLINE_SIM_FPU(TYPE) static TYPE UNUSED
 #  define EXTERN_SIM_FPU_P 0
 # endif
 #else
-# define INLINE_SIM_FPU(TYPE) TYPE REGPARM_SIM_FPU
+# define INLINE_SIM_FPU(TYPE) TYPE
 # define EXTERN_SIM_FPU_P 1
 #endif
 
 #if (SIM_FPU_INLINE & INLINE_LOCALS)
 # define STATIC_INLINE_SIM_FPU(TYPE) static INLINE TYPE
 #else
-# define STATIC_INLINE_SIM_FPU(TYPE) static TYPE REGPARM_SIM_FPU
+# define STATIC_INLINE_SIM_FPU(TYPE) static TYPE
 #endif
 
 #define STATIC_SIM_FPU(TYPE) static TYPE
@@ -568,12 +512,6 @@
 
 /* sim-types */
 
-#if (SIM_TYPES_INLINE & REGPARM_MODULE)
-# define REGPARM_SIM_TYPES REGPARM
-#else
-# define REGPARM_SIM_TYPES
-#endif
-
 #if ((H_REVEALS_MODULE_P (SIM_TYPES_INLINE) || defined (SIM_INLINE_C)) \
      && !defined (SIM_TYPES_C) \
      && (REVEAL_MODULE_P (SIM_TYPES_INLINE)))
@@ -581,18 +519,18 @@
 #  define INLINE_SIM_TYPES(TYPE) static INLINE TYPE UNUSED
 #  define EXTERN_SIM_TYPES_P 0
 # else
-#  define INLINE_SIM_TYPES(TYPE) static TYPE UNUSED REGPARM_SIM_TYPES
+#  define INLINE_SIM_TYPES(TYPE) static TYPE UNUSED
 #  define EXTERN_SIM_TYPES_P 0
 # endif
 #else
-# define INLINE_SIM_TYPES(TYPE) TYPE REGPARM_SIM_TYPES
+# define INLINE_SIM_TYPES(TYPE) TYPE
 # define EXTERN_SIM_TYPES_P 1
 #endif
 
 #if (SIM_TYPES_INLINE & INLINE_LOCALS)
 # define STATIC_INLINE_SIM_TYPES(TYPE) static INLINE TYPE
 #else
-# define STATIC_INLINE_SIM_TYPES(TYPE) static TYPE REGPARM_SIM_TYPES
+# define STATIC_INLINE_SIM_TYPES(TYPE) static TYPE
 #endif
 
 #define STATIC_SIM_TYPES(TYPE) static TYPE
@@ -605,12 +543,6 @@
 # define SIM_MAIN_INLINE (ALL_C_INLINE)
 #endif
 
-#if (SIM_MAIN_INLINE & REGPARM_MODULE)
-# define REGPARM_SIM_MAIN REGPARM
-#else
-# define REGPARM_SIM_MAIN
-#endif
-
 #if ((H_REVEALS_MODULE_P (SIM_MAIN_INLINE) || defined (SIM_INLINE_C)) \
      && !defined (SIM_MAIN_C) \
      && (REVEAL_MODULE_P (SIM_MAIN_INLINE)))
@@ -618,30 +550,24 @@
 #  define INLINE_SIM_MAIN(TYPE) static INLINE TYPE UNUSED
 #  define EXTERN_SIM_MAIN_P 0
 # else
-#  define INLINE_SIM_MAIN(TYPE) static TYPE UNUSED REGPARM_SIM_MAIN
+#  define INLINE_SIM_MAIN(TYPE) static TYPE UNUSED
 #  define EXTERN_SIM_MAIN_P 0
 # endif
 #else
-# define INLINE_SIM_MAIN(TYPE) TYPE REGPARM_SIM_MAIN
+# define INLINE_SIM_MAIN(TYPE) TYPE
 # define EXTERN_SIM_MAIN_P 1
 #endif
 
 #if (SIM_MAIN_INLINE & INLINE_LOCALS)
 # define STATIC_INLINE_SIM_MAIN(TYPE) static INLINE TYPE
 #else
-# define STATIC_INLINE_SIM_MAIN(TYPE) static TYPE REGPARM_SIM_MAIN
+# define STATIC_INLINE_SIM_MAIN(TYPE) static TYPE
 #endif
 
 #define STATIC_SIM_MAIN(TYPE) static TYPE
 
 /* engine */
 
-#if (ENGINE_INLINE & REGPARM_MODULE)
-# define REGPARM_ENGINE REGPARM
-#else
-# define REGPARM_ENGINE
-#endif
-
 #if ((H_REVEALS_MODULE_P (ENGINE_INLINE) || defined (SIM_INLINE_C)) \
      && !defined (ENGINE_C) \
      && (REVEAL_MODULE_P (ENGINE_INLINE)))
@@ -649,18 +575,18 @@
 #  define INLINE_ENGINE(TYPE) static INLINE TYPE UNUSED
 #  define EXTERN_ENGINE_P 0
 # else
-#  define INLINE_ENGINE(TYPE) static TYPE UNUSED REGPARM_ENGINE
+#  define INLINE_ENGINE(TYPE) static TYPE UNUSED
 #  define EXTERN_ENGINE_P 0
 # endif
 #else
-# define INLINE_ENGINE(TYPE) TYPE REGPARM_ENGINE
+# define INLINE_ENGINE(TYPE) TYPE
 # define EXTERN_ENGINE_P 1
 #endif
 
 #if (ENGINE_INLINE & INLINE_LOCALS)
 # define STATIC_INLINE_ENGINE(TYPE) static INLINE TYPE
 #else
-# define STATIC_INLINE_ENGINE(TYPE) static TYPE REGPARM_ENGINE
+# define STATIC_INLINE_ENGINE(TYPE) static TYPE
 #endif
 
 #define STATIC_ENGINE(TYPE) static TYPE
@@ -669,12 +595,6 @@
 
 /* icache */
 
-#if (ICACHE_INLINE & REGPARM_MODULE)
-# define REGPARM_ICACHE REGPARM
-#else
-# define REGPARM_ICACHE
-#endif
-
 #if ((H_REVEALS_MODULE_P (ICACHE_INLINE) || defined (SIM_INLINE_C)) \
      && !defined (ICACHE_C) \
      && (REVEAL_MODULE_P (ICACHE_INLINE)))
@@ -682,18 +602,18 @@
 #  define INLINE_ICACHE(TYPE) static INLINE TYPE UNUSED
 #  define EXTERN_ICACHE_P 0
 #else
-#  define INLINE_ICACHE(TYPE) static TYPE UNUSED REGPARM_ICACHE
+#  define INLINE_ICACHE(TYPE) static TYPE UNUSED
 #  define EXTERN_ICACHE_P 0
 #endif
 #else
-# define INLINE_ICACHE(TYPE) TYPE REGPARM_ICACHE
+# define INLINE_ICACHE(TYPE) TYPE
 # define EXTERN_ICACHE_P 1
 #endif
 
 #if (ICACHE_INLINE & INLINE_LOCALS)
 # define STATIC_INLINE_ICACHE(TYPE) static INLINE TYPE
 #else
-# define STATIC_INLINE_ICACHE(TYPE) static TYPE REGPARM_ICACHE
+# define STATIC_INLINE_ICACHE(TYPE) static TYPE
 #endif
 
 #define STATIC_ICACHE(TYPE) static TYPE
@@ -702,12 +622,6 @@
 
 /* idecode */
 
-#if (IDECODE_INLINE & REGPARM_MODULE)
-# define REGPARM_IDECODE REGPARM
-#else
-# define REGPARM_IDECODE
-#endif
-
 #if ((H_REVEALS_MODULE_P (IDECODE_INLINE) || defined (SIM_INLINE_C)) \
      && !defined (IDECODE_C) \
      && (REVEAL_MODULE_P (IDECODE_INLINE)))
@@ -715,18 +629,18 @@
 #  define INLINE_IDECODE(TYPE) static INLINE TYPE UNUSED
 #  define EXTERN_IDECODE_P 0
 #else
-#  define INLINE_IDECODE(TYPE) static TYPE UNUSED REGPARM_IDECODE
+#  define INLINE_IDECODE(TYPE) static TYPE UNUSED
 #  define EXTERN_IDECODE_P 0
 #endif
 #else
-# define INLINE_IDECODE(TYPE) TYPE REGPARM_IDECODE
+# define INLINE_IDECODE(TYPE) TYPE
 # define EXTERN_IDECODE_P 1
 #endif
 
 #if (IDECODE_INLINE & INLINE_LOCALS)
 # define STATIC_INLINE_IDECODE(TYPE) static INLINE TYPE
 #else
-# define STATIC_INLINE_IDECODE(TYPE) static TYPE REGPARM_IDECODE
+# define STATIC_INLINE_IDECODE(TYPE) static TYPE
 #endif
 
 #define STATIC_IDECODE(TYPE) static TYPE
@@ -735,12 +649,6 @@
 
 /* semantics */
 
-#if (SEMANTICS_INLINE & REGPARM_MODULE)
-# define REGPARM_SEMANTICS REGPARM
-#else
-# define REGPARM_SEMANTICS
-#endif
-
 #if ((H_REVEALS_MODULE_P (SEMANTICS_INLINE) || defined (SIM_INLINE_C)) \
      && !defined (SEMANTICS_C) \
      && (REVEAL_MODULE_P (SEMANTICS_INLINE)))
@@ -748,24 +656,24 @@
 #  define INLINE_SEMANTICS(TYPE) static INLINE TYPE UNUSED
 #  define EXTERN_SEMANTICS_P 0
 #else
-#  define INLINE_SEMANTICS(TYPE) static TYPE UNUSED REGPARM_SEMANTICS
+#  define INLINE_SEMANTICS(TYPE) static TYPE UNUSED
 #  define EXTERN_SEMANTICS_P 0
 #endif
 #else
-# define INLINE_SEMANTICS(TYPE) TYPE REGPARM_SEMANTICS
+# define INLINE_SEMANTICS(TYPE) TYPE
 # define EXTERN_SEMANTICS_P 1
 #endif
 
 #if EXTERN_SEMANTICS_P
-# define EXTERN_SEMANTICS(TYPE) TYPE REGPARM_SEMANTICS
+# define EXTERN_SEMANTICS(TYPE) TYPE
 #else
-# define EXTERN_SEMANTICS(TYPE) static TYPE UNUSED REGPARM_SEMANTICS
+# define EXTERN_SEMANTICS(TYPE) static TYPE UNUSED
 #endif
 
 #if (SEMANTICS_INLINE & INLINE_LOCALS)
 # define STATIC_INLINE_SEMANTICS(TYPE) static INLINE TYPE
 #else
-# define STATIC_INLINE_SEMANTICS(TYPE) static TYPE REGPARM_SEMANTICS
+# define STATIC_INLINE_SEMANTICS(TYPE) static TYPE
 #endif
 
 #define STATIC_SEMANTICS(TYPE) static TYPE
@@ -778,12 +686,6 @@
 # define SUPPORT_INLINE ALL_C_INLINE
 #endif
 
-#if (SUPPORT_INLINE & REGPARM_MODULE)
-# define REGPARM_SUPPORT REGPARM
-#else
-# define REGPARM_SUPPORT
-#endif
-
 #if ((H_REVEALS_MODULE_P (SUPPORT_INLINE) || defined (SIM_INLINE_C)) \
      && !defined (SUPPORT_C) \
      && (REVEAL_MODULE_P (SUPPORT_INLINE)))
@@ -791,18 +693,18 @@
 #  define INLINE_SUPPORT(TYPE) static INLINE TYPE UNUSED
 #  define EXTERN_SUPPORT_P 0
 #else
-#  define INLINE_SUPPORT(TYPE) static TYPE UNUSED REGPARM_SUPPORT
+#  define INLINE_SUPPORT(TYPE) static TYPE UNUSED
 #  define EXTERN_SUPPORT_P 0
 #endif
 #else
-# define INLINE_SUPPORT(TYPE) TYPE REGPARM_SUPPORT
+# define INLINE_SUPPORT(TYPE) TYPE
 # define EXTERN_SUPPORT_P 1
 #endif
 
 #if (SUPPORT_INLINE & INLINE_LOCALS)
 # define STATIC_INLINE_SUPPORT(TYPE) static INLINE TYPE
 #else
-# define STATIC_INLINE_SUPPORT(TYPE) static TYPE REGPARM_SUPPORT
+# define STATIC_INLINE_SUPPORT(TYPE) static TYPE
 #endif
 
 #define STATIC_SUPPORT(TYPE) static TYPE
diff --git a/sim/cr16/ChangeLog b/sim/cr16/ChangeLog
index d9ec562..4d73a37 100644
--- a/sim/cr16/ChangeLog
+++ b/sim/cr16/ChangeLog
@@ -2,6 +2,10 @@
 
 	* configure: Regenerate.
 
+2016-01-10  Mike Frysinger  <vapier@gentoo.org>
+
+	* configure: Regenerate.
+
 2016-01-09  Mike Frysinger  <vapier@gentoo.org>
 
 	* config.in, configure: Regenerate.
diff --git a/sim/cr16/configure b/sim/cr16/configure
index 5e47cd4..8ce8009 100755
diff --git a/sim/cris/ChangeLog b/sim/cris/ChangeLog
index 3ffe1c7..25f140e 100644
--- a/sim/cris/ChangeLog
+++ b/sim/cris/ChangeLog
@@ -2,6 +2,10 @@
 
 	* configure: Regenerate.
 
+2016-01-10  Mike Frysinger  <vapier@gentoo.org>
+
+	* configure: Regenerate.
+
 2016-01-09  Mike Frysinger  <vapier@gentoo.org>
 
 	* config.in, configure: Regenerate.
diff --git a/sim/cris/configure b/sim/cris/configure
index e282c13..565ffea 100755
diff --git a/sim/d10v/ChangeLog b/sim/d10v/ChangeLog
index 115ac0d..95ff51e 100644
--- a/sim/d10v/ChangeLog
+++ b/sim/d10v/ChangeLog
@@ -2,6 +2,10 @@
 
 	* configure: Regenerate.
 
+2016-01-10  Mike Frysinger  <vapier@gentoo.org>
+
+	* configure: Regenerate.
+
 2016-01-09  Mike Frysinger  <vapier@gentoo.org>
 
 	* config.in, configure: Regenerate.
diff --git a/sim/d10v/configure b/sim/d10v/configure
index 027cd01..7e68943 100755
diff --git a/sim/erc32/ChangeLog b/sim/erc32/ChangeLog
index 8330832..2d01898 100644
--- a/sim/erc32/ChangeLog
+++ b/sim/erc32/ChangeLog
@@ -2,6 +2,10 @@
 
 	* configure: Regenerate.
 
+2016-01-10  Mike Frysinger  <vapier@gentoo.org>
+
+	* configure: Regenerate.
+
 2016-01-09  Mike Frysinger  <vapier@gentoo.org>
 
 	* config.in, configure: Regenerate.
diff --git a/sim/erc32/configure b/sim/erc32/configure
index 726cbf0..a3af2ab 100755
diff --git a/sim/frv/ChangeLog b/sim/frv/ChangeLog
index c06ec3d..7e509be 100644
--- a/sim/frv/ChangeLog
+++ b/sim/frv/ChangeLog
@@ -2,6 +2,10 @@
 
 	* configure: Regenerate.
 
+2016-01-10  Mike Frysinger  <vapier@gentoo.org>
+
+	* configure: Regenerate.
+
 2016-01-09  Mike Frysinger  <vapier@gentoo.org>
 
 	* config.in, configure: Regenerate.
diff --git a/sim/frv/configure b/sim/frv/configure
index 48c0bdb..748971a 100755
diff --git a/sim/ft32/ChangeLog b/sim/ft32/ChangeLog
index 639f37b..fb1210e 100644
--- a/sim/ft32/ChangeLog
+++ b/sim/ft32/ChangeLog
@@ -2,6 +2,10 @@
 
 	* configure: Regenerate.
 
+2016-01-10  Mike Frysinger  <vapier@gentoo.org>
+
+	* configure: Regenerate.
+
 2016-01-09  Mike Frysinger  <vapier@gentoo.org>
 
 	* config.in, configure: Regenerate.
diff --git a/sim/ft32/configure b/sim/ft32/configure
index c8b2833..e4d2bc7 100755
diff --git a/sim/h8300/ChangeLog b/sim/h8300/ChangeLog
index 75c4d82..09f141a 100644
--- a/sim/h8300/ChangeLog
+++ b/sim/h8300/ChangeLog
@@ -2,6 +2,10 @@
 
 	* configure: Regenerate.
 
+2016-01-10  Mike Frysinger  <vapier@gentoo.org>
+
+	* configure: Regenerate.
+
 2016-01-09  Mike Frysinger  <vapier@gentoo.org>
 
 	* config.in, configure: Regenerate.
diff --git a/sim/h8300/configure b/sim/h8300/configure
index dc75ac2..7895bd7 100755
diff --git a/sim/igen/ChangeLog b/sim/igen/ChangeLog
index 15137f1..2a47578 100644
--- a/sim/igen/ChangeLog
+++ b/sim/igen/ChangeLog
@@ -1,3 +1,7 @@
+2016-01-10  Mike Frysinger  <vapier@gentoo.org>
+
+	* configure: Regenerate.
+
 2016-01-04  Mike Frysinger  <vapier@gentoo.org>
 
 	* configure: Regenerate.
diff --git a/sim/igen/configure b/sim/igen/configure
index 92c5200..14f4058 100755
diff --git a/sim/iq2000/ChangeLog b/sim/iq2000/ChangeLog
index f8582a4..8bcf0db 100644
--- a/sim/iq2000/ChangeLog
+++ b/sim/iq2000/ChangeLog
@@ -2,6 +2,10 @@
 
 	* configure: Regenerate.
 
+2016-01-10  Mike Frysinger  <vapier@gentoo.org>
+
+	* configure: Regenerate.
+
 2016-01-09  Mike Frysinger  <vapier@gentoo.org>
 
 	* config.in, configure: Regenerate.
diff --git a/sim/iq2000/configure b/sim/iq2000/configure
index 071c452..92a2843 100755
diff --git a/sim/lm32/ChangeLog b/sim/lm32/ChangeLog
index 0b4fb4d..cf7ce4a 100644
--- a/sim/lm32/ChangeLog
+++ b/sim/lm32/ChangeLog
@@ -2,6 +2,10 @@
 
 	* configure: Regenerate.
 
+2016-01-10  Mike Frysinger  <vapier@gentoo.org>
+
+	* configure: Regenerate.
+
 2016-01-09  Mike Frysinger  <vapier@gentoo.org>
 
 	* config.in, configure: Regenerate.
diff --git a/sim/lm32/configure b/sim/lm32/configure
index 6c9c630..4603179 100755
diff --git a/sim/m32c/ChangeLog b/sim/m32c/ChangeLog
index 28ea318..1aeb75f 100644
--- a/sim/m32c/ChangeLog
+++ b/sim/m32c/ChangeLog
@@ -2,6 +2,10 @@
 
 	* configure: Regenerate.
 
+2016-01-10  Mike Frysinger  <vapier@gentoo.org>
+
+	* configure: Regenerate.
+
 2016-01-09  Mike Frysinger  <vapier@gentoo.org>
 
 	* config.in, configure: Regenerate.
diff --git a/sim/m32c/configure b/sim/m32c/configure
index 4341010..c083a20 100755
diff --git a/sim/m32r/ChangeLog b/sim/m32r/ChangeLog
index a6771fd..dc35301 100644
--- a/sim/m32r/ChangeLog
+++ b/sim/m32r/ChangeLog
@@ -2,6 +2,10 @@
 
 	* configure: Regenerate.
 
+2016-01-10  Mike Frysinger  <vapier@gentoo.org>
+
+	* configure: Regenerate.
+
 2016-01-09  Mike Frysinger  <vapier@gentoo.org>
 
 	* config.in, configure: Regenerate.
diff --git a/sim/m32r/configure b/sim/m32r/configure
index afae89d..3f632ef 100755
diff --git a/sim/m68hc11/ChangeLog b/sim/m68hc11/ChangeLog
index a61ff11..893867c 100644
--- a/sim/m68hc11/ChangeLog
+++ b/sim/m68hc11/ChangeLog
@@ -2,6 +2,10 @@
 
 	* configure: Regenerate.
 
+2016-01-10  Mike Frysinger  <vapier@gentoo.org>
+
+	* configure: Regenerate.
+
 2016-01-09  Mike Frysinger  <vapier@gentoo.org>
 
 	* config.in, configure: Regenerate.
diff --git a/sim/m68hc11/configure b/sim/m68hc11/configure
index 5921c48..aa9b7ed 100755
diff --git a/sim/mcore/ChangeLog b/sim/mcore/ChangeLog
index db04072..f4a2721 100644
--- a/sim/mcore/ChangeLog
+++ b/sim/mcore/ChangeLog
@@ -2,6 +2,10 @@
 
 	* configure: Regenerate.
 
+2016-01-10  Mike Frysinger  <vapier@gentoo.org>
+
+	* configure: Regenerate.
+
 2016-01-09  Mike Frysinger  <vapier@gentoo.org>
 
 	* config.in, configure: Regenerate.
diff --git a/sim/mcore/configure b/sim/mcore/configure
index 027cd01..7e68943 100755
diff --git a/sim/microblaze/ChangeLog b/sim/microblaze/ChangeLog
index 84c45e6..079ef0e 100644
--- a/sim/microblaze/ChangeLog
+++ b/sim/microblaze/ChangeLog
@@ -2,6 +2,10 @@
 
 	* configure: Regenerate.
 
+2016-01-10  Mike Frysinger  <vapier@gentoo.org>
+
+	* configure: Regenerate.
+
 2016-01-09  Mike Frysinger  <vapier@gentoo.org>
 
 	* config.in, configure: Regenerate.
diff --git a/sim/microblaze/configure b/sim/microblaze/configure
index 027cd01..7e68943 100755
diff --git a/sim/mips/ChangeLog b/sim/mips/ChangeLog
index 98bef9a..f7c5ae8 100644
--- a/sim/mips/ChangeLog
+++ b/sim/mips/ChangeLog
@@ -2,6 +2,10 @@
 
 	* configure: Regenerate.
 
+2016-01-10  Mike Frysinger  <vapier@gentoo.org>
+
+	* configure: Regenerate.
+
 2016-01-09  Mike Frysinger  <vapier@gentoo.org>
 
 	* config.in, configure: Regenerate.
diff --git a/sim/mips/configure b/sim/mips/configure
index 3b69a00..16427de 100755
diff --git a/sim/mn10300/ChangeLog b/sim/mn10300/ChangeLog
index 591ca58..c1cc6c0 100644
--- a/sim/mn10300/ChangeLog
+++ b/sim/mn10300/ChangeLog
@@ -2,6 +2,10 @@
 
 	* configure: Regenerate.
 
+2016-01-10  Mike Frysinger  <vapier@gentoo.org>
+
+	* configure: Regenerate.
+
 2016-01-09  Mike Frysinger  <vapier@gentoo.org>
 
 	* config.in, configure: Regenerate.
diff --git a/sim/mn10300/configure b/sim/mn10300/configure
index 4f0f45c..0fa3617 100755
diff --git a/sim/moxie/ChangeLog b/sim/moxie/ChangeLog
index beaff02..d7cd663 100644
--- a/sim/moxie/ChangeLog
+++ b/sim/moxie/ChangeLog
@@ -1,6 +1,10 @@
 2016-01-10  Mike Frysinger  <vapier@gentoo.org>
 
 	* configure: Regenerate.
+
+2016-01-10  Mike Frysinger  <vapier@gentoo.org>
+
+	* configure: Regenerate.
 	* Makefile.in (SIM_CFLAGS): Rename to ...
 	(SIM_EXTRA_CFLAGS): ... this.
 
diff --git a/sim/moxie/configure b/sim/moxie/configure
index 802f589..161f2ab 100755
diff --git a/sim/msp430/ChangeLog b/sim/msp430/ChangeLog
index 15877a6..c643180 100644
--- a/sim/msp430/ChangeLog
+++ b/sim/msp430/ChangeLog
@@ -2,6 +2,10 @@
 
 	* configure: Regenerate.
 
+2016-01-10  Mike Frysinger  <vapier@gentoo.org>
+
+	* configure: Regenerate.
+
 2016-01-09  Mike Frysinger  <vapier@gentoo.org>
 
 	* config.in, configure: Regenerate.
diff --git a/sim/msp430/configure b/sim/msp430/configure
index 4e3b2e7..85c89ca 100755
diff --git a/sim/ppc/ChangeLog b/sim/ppc/ChangeLog
index 25bdd6c..01b07c9 100644
--- a/sim/ppc/ChangeLog
+++ b/sim/ppc/ChangeLog
@@ -1,5 +1,17 @@
 2016-01-10  Mike Frysinger  <vapier@gentoo.org>
 
+	* configure.ac: Delete --enable-sim-regparm and sim_regparm,
+	and --enable-sim-stdcall and sim_stdcall.
+	* configure: Regenerate.
+	* Makefile.in (REGPARM_CFLAGS, STDCALL_CFLAGS): Delete.
+	(CONFIG_CFLAGS): Delete $(REGPARM_CFLAGS) and $(STDCALL_CFLAGS).
+	* inline.h: Delete REGPARM everywhere.
+	* options.c (print_options): Delete WITH_REGPARM and
+	WITH_STDCALL.
+	* std-config.h (WITH_REGPARM, WITH_STDCALL, REGPARM): Delete.
+
+2016-01-10  Mike Frysinger  <vapier@gentoo.org>
+
 	* configure.ac: Delete --enable-sim-cflags and sim_cflags.
 	* configure: Regenerate.
 	* INSTALL: Delete all mention of --enable-sim-cflags.
diff --git a/sim/ppc/Makefile.in b/sim/ppc/Makefile.in
index 139fc6c..7d30fae 100644
--- a/sim/ppc/Makefile.in
+++ b/sim/ppc/Makefile.in
@@ -72,8 +72,6 @@ RANLIB = @RANLIB@
 
 INLINE_CFLAGS = @sim_inline@
 ENDIAN_CFLAGS = @sim_endian@
-REGPARM_CFLAGS = @sim_regparm@
-STDCALL_CFLAGS = @sim_stdcall@
 HOSTENDIAN_CFLAGS = @sim_hostendian@
 SMP_CFLAGS = @sim_smp@
 XOR_ENDIAN_CFLAGS = @sim_xor_endian@
@@ -94,8 +92,6 @@ WARNING_CFLAGS = @sim_warnings@
 DEVZERO_CFLAGS = @sim_devzero@
 CONFIG_CFLAGS = \
   $(ENDIAN_CFLAGS) \
-  $(REGPARM_CFLAGS) \
-  $(STDCALL_CFLAGS) \
   $(HOSTENDIAN_CFLAGS) \
   $(SMP_CFLAGS) \
   $(XOR_ENDIAN_CFLAGS) \
diff --git a/sim/ppc/configure b/sim/ppc/configure
index d552628..260aa54 100755
diff --git a/sim/ppc/configure.ac b/sim/ppc/configure.ac
index 0b6f849..8ac9fd0 100644
--- a/sim/ppc/configure.ac
+++ b/sim/ppc/configure.ac
@@ -506,19 +506,6 @@ if test x"$silent" != x"yes"; then
 fi])dnl
 
 
-AC_ARG_ENABLE(sim-regparm,
-[  --enable-sim-regparm=nr-parm		Pass parameters in registers instead of on the stack - x86/GCC specific.],
-[case "${enableval}" in
-  0*|1*|2*|3*|4*|5*|6*|7*|8*|9*) sim_regparm="-DWITH_REGPARM=${enableval}";;
-  no)                            sim_regparm="" ;;
-  yes)                           sim_regparm="-DWITH_REGPARM=3";;
-  *)   AC_MSG_ERROR("Unknown value $enableval for --enable-sim-regparm"); sim_regparm="";;
-esac
-if test x"$silent" != x"yes" && test x"$sim_regparm" != x""; then
-  echo "Setting regparm flags = $sim_regparm" 6>&1
-fi],[sim_regparm=""])dnl
-
-
 AC_ARG_ENABLE(sim-reserved-bits,
 [  --enable-sim-reserved-bits		Specify whether to check reserved bits in instruction.],
 [case "${enableval}" in
@@ -546,19 +533,6 @@ if test x"$silent" != x"yes"; then
 fi])dnl
 
 
-AC_ARG_ENABLE(sim-stdcall,
-[  --enable-sim-stdcall=type		Use an alternative function call/return mechanism - x86/GCC specific.],
-[case "${enableval}" in
-  no)		sim_stdcall="" ;;
-  std*)		sim_stdcall="-DWITH_STDCALL=1";;
-  yes)		sim_stdcall="-DWITH_STDCALL=1";;
-  *)   AC_MSG_ERROR("Unknown value $enableval for --enable-sim-stdcall"); sim_stdcall="";;
-esac
-if test x"$silent" != x"yes" && test x"$sim_stdcall" != x""; then
-  echo "Setting function call flags = $sim_stdcall" 6>&1
-fi],[sim_stdcall=""])dnl
-
-
 AC_ARG_ENABLE(sim-stdio,
 [  --enable-sim-stdio			Specify whether to use stdio for console input/output.],
 [case "${enableval}" in
@@ -878,8 +852,6 @@ AC_SUBST(sim_pk_src)
 AC_SUBST(sim_pk_obj)
 AC_SUBST(sim_inline)
 AC_SUBST(sim_endian)
-AC_SUBST(sim_regparm)
-AC_SUBST(sim_stdcall)
 AC_SUBST(sim_xor_endian)
 AC_SUBST(sim_hostendian)
 AC_SUBST(sim_smp)
diff --git a/sim/ppc/inline.h b/sim/ppc/inline.h
index 6c4d325..55de0bb 100644
--- a/sim/ppc/inline.h
+++ b/sim/ppc/inline.h
@@ -316,21 +316,21 @@
 #if defined(_INLINE_C_) && !defined(_SEMANTICS_C_) && (SEMANTICS_INLINE & INCLUDE_MODULE)
 # if (SEMANTICS_INLINE & INLINE_MODULE)
 #  define PSIM_INLINE_SEMANTICS(TYPE) static INLINE TYPE UNUSED
-#  define PSIM_EXTERN_SEMANTICS(TYPE) static TYPE UNUSED REGPARM
+#  define PSIM_EXTERN_SEMANTICS(TYPE) static TYPE UNUSED
 #else
-#  define PSIM_INLINE_SEMANTICS(TYPE) static TYPE UNUSED REGPARM
-#  define PSIM_EXTERN_SEMANTICS(TYPE) static TYPE UNUSED REGPARM
+#  define PSIM_INLINE_SEMANTICS(TYPE) static TYPE UNUSED
+#  define PSIM_EXTERN_SEMANTICS(TYPE) static TYPE UNUSED
 #endif
 #else
-# define PSIM_INLINE_SEMANTICS(TYPE) TYPE REGPARM
-# define PSIM_EXTERN_SEMANTICS(TYPE) TYPE REGPARM
+# define PSIM_INLINE_SEMANTICS(TYPE) TYPE
+# define PSIM_EXTERN_SEMANTICS(TYPE) TYPE
 #endif
 
 #if 0 /* this isn't used */
 #if (SEMANTICS_INLINE & PSIM_INLINE_LOCALS)
 # define STATIC_INLINE_SEMANTICS(TYPE) static INLINE TYPE
 #else
-# define STATIC_INLINE_SEMANTICS(TYPE) static TYPE REGPARM
+# define STATIC_INLINE_SEMANTICS(TYPE) static TYPE
 #endif
 #endif
 
@@ -340,21 +340,21 @@
 #if defined(_INLINE_C_) && !defined(_IDECODE_C_) && (IDECODE_INLINE & INCLUDE_MODULE)
 # if (IDECODE_INLINE & INLINE_MODULE)
 #  define PSIM_INLINE_IDECODE(TYPE) static INLINE TYPE UNUSED
-#  define EXTERN_IDECODE(TYPE) static TYPE UNUSED REGPARM
+#  define EXTERN_IDECODE(TYPE) static TYPE UNUSED
 #else
-#  define PSIM_INLINE_IDECODE(TYPE) static TYPE UNUSED REGPARM
-#  define EXTERN_IDECODE(TYPE) static TYPE UNUSED REGPARM
+#  define PSIM_INLINE_IDECODE(TYPE) static TYPE UNUSED
+#  define EXTERN_IDECODE(TYPE) static TYPE UNUSED
 #endif
 #else
-# define PSIM_INLINE_IDECODE(TYPE) TYPE REGPARM
-# define EXTERN_IDECODE(TYPE) TYPE REGPARM
+# define PSIM_INLINE_IDECODE(TYPE) TYPE
+# define EXTERN_IDECODE(TYPE) TYPE
 #endif
 
 #if 0 /* this isn't used */
 #if (IDECODE_INLINE & PSIM_INLINE_LOCALS)
 # define STATIC_INLINE_IDECODE(TYPE) static INLINE TYPE
 #else
-# define STATIC_INLINE_IDECODE(TYPE) static TYPE REGPARM
+# define STATIC_INLINE_IDECODE(TYPE) static TYPE
 #endif
 #endif
 
@@ -364,21 +364,21 @@
 #if defined(_INLINE_C_) && !defined(_ICACHE_C_) && (ICACHE_INLINE & INCLUDE_MODULE)
 # if (ICACHE_INLINE & INLINE_MODULE)
 #  define PSIM_INLINE_ICACHE(TYPE) static INLINE TYPE UNUSED
-#  define EXTERN_ICACHE(TYPE) static TYPE UNUSED REGPARM
+#  define EXTERN_ICACHE(TYPE) static TYPE UNUSED
 #else
-#  define PSIM_INLINE_ICACHE(TYPE) static TYPE UNUSED REGPARM
-#  define EXTERN_ICACHE(TYPE) static TYPE UNUSED REGPARM
+#  define PSIM_INLINE_ICACHE(TYPE) static TYPE UNUSED
+#  define EXTERN_ICACHE(TYPE) static TYPE UNUSED
 #endif
 #else
-# define PSIM_INLINE_ICACHE(TYPE) TYPE REGPARM
-# define EXTERN_ICACHE(TYPE) TYPE REGPARM
+# define PSIM_INLINE_ICACHE(TYPE) TYPE
+# define EXTERN_ICACHE(TYPE) TYPE
 #endif
 
 #if 0 /* this isn't used */
 #if (ICACHE_INLINE & PSIM_INLINE_LOCALS)
 # define STATIC_INLINE_ICACHE(TYPE) static INLINE TYPE
 #else
-# define STATIC_INLINE_ICACHE(TYPE) static TYPE REGPARM
+# define STATIC_INLINE_ICACHE(TYPE) static TYPE
 #endif
 #endif
 
diff --git a/sim/ppc/options.c b/sim/ppc/options.c
index b8f9f9c..169378e 100644
--- a/sim/ppc/options.c
+++ b/sim/ppc/options.c
@@ -137,8 +137,6 @@ print_options (void)
   printf_filtered ("WITH_MODEL_ISSUE         = %d\n", WITH_MODEL_ISSUE);
   printf_filtered ("WITH_RESERVED_BITS       = %d\n", WITH_RESERVED_BITS);
   printf_filtered ("WITH_STDIO               = %d\n", WITH_STDIO);
-  printf_filtered ("WITH_REGPARM             = %d\n", WITH_REGPARM);
-  printf_filtered ("WITH_STDCALL             = %d\n", WITH_STDCALL);
   printf_filtered ("DEFAULT_INLINE           = %s\n", options_inline (DEFAULT_INLINE));
   printf_filtered ("SIM_ENDIAN_INLINE        = %s\n", options_inline (SIM_ENDIAN_INLINE));
   printf_filtered ("BITS_INLINE              = %s\n", options_inline (BITS_INLINE));
diff --git a/sim/ppc/std-config.h b/sim/ppc/std-config.h
index 04ba654..badce3d 100644
--- a/sim/ppc/std-config.h
+++ b/sim/ppc/std-config.h
@@ -453,40 +453,6 @@ extern int current_stdio;
 #endif
 
 
-/* Your compilers pass parameters in registers reserved word */
-
-#ifndef WITH_REGPARM
-#define WITH_REGPARM                   0
-#endif
-
-/* Your compilers use an alternative calling sequence reserved word */
-
-#ifndef WITH_STDCALL
-#define WITH_STDCALL                   0
-#endif
-
-#if !defined REGPARM
-#if defined(__GNUC__) && (defined(__i386__) || defined(__i486__) || defined(__i586__) || defined(__i686__))
-#if (WITH_REGPARM && WITH_STDCALL)
-#define REGPARM __attribute__((__regparm__(WITH_REGPARM),__stdcall__))
-#else
-#if (WITH_REGPARM && !WITH_STDCALL)
-#define REGPARM __attribute__((__regparm__(WITH_REGPARM)))
-#else
-#if (!WITH_REGPARM && WITH_STDCALL)
-#define REGPARM __attribute__((__stdcall__))
-#endif
-#endif
-#endif
-#endif
-#endif
-
-#if !defined REGPARM
-#define REGPARM
-#endif
-
-
-
 /* Default prefix for static functions */
 
 #ifndef STATIC_INLINE
diff --git a/sim/rl78/ChangeLog b/sim/rl78/ChangeLog
index 8eed2d6..49fc40e 100644
--- a/sim/rl78/ChangeLog
+++ b/sim/rl78/ChangeLog
@@ -2,6 +2,10 @@
 
 	* configure: Regenerate.
 
+2016-01-10  Mike Frysinger  <vapier@gentoo.org>
+
+	* configure: Regenerate.
+
 2016-01-09  Mike Frysinger  <vapier@gentoo.org>
 
 	* config.in, configure: Regenerate.
diff --git a/sim/rl78/configure b/sim/rl78/configure
index 7064842..cad712e 100755
diff --git a/sim/rx/ChangeLog b/sim/rx/ChangeLog
index 913b5cc..d48d10b 100644
--- a/sim/rx/ChangeLog
+++ b/sim/rx/ChangeLog
@@ -2,6 +2,10 @@
 
 	* configure: Regenerate.
 
+2016-01-10  Mike Frysinger  <vapier@gentoo.org>
+
+	* configure: Regenerate.
+
 2016-01-09  Mike Frysinger  <vapier@gentoo.org>
 
 	* config.in, configure: Regenerate.
diff --git a/sim/rx/configure b/sim/rx/configure
index 9d12c40..824447a 100755
diff --git a/sim/sh/ChangeLog b/sim/sh/ChangeLog
index ccc671a..104a36b 100644
--- a/sim/sh/ChangeLog
+++ b/sim/sh/ChangeLog
@@ -2,6 +2,10 @@
 
 	* configure: Regenerate.
 
+2016-01-10  Mike Frysinger  <vapier@gentoo.org>
+
+	* configure: Regenerate.
+
 2016-01-09  Mike Frysinger  <vapier@gentoo.org>
 
 	* config.in, configure: Regenerate.
diff --git a/sim/sh/configure b/sim/sh/configure
index 027cd01..7e68943 100755
diff --git a/sim/sh64/ChangeLog b/sim/sh64/ChangeLog
index 7499506..0de22fc 100644
--- a/sim/sh64/ChangeLog
+++ b/sim/sh64/ChangeLog
@@ -2,6 +2,10 @@
 
 	* configure: Regenerate.
 
+2016-01-10  Mike Frysinger  <vapier@gentoo.org>
+
+	* configure: Regenerate.
+
 2016-01-09  Mike Frysinger  <vapier@gentoo.org>
 
 	* config.in, configure: Regenerate.
diff --git a/sim/sh64/configure b/sim/sh64/configure
index 3e0a8b2..e236b7d 100755
diff --git a/sim/v850/ChangeLog b/sim/v850/ChangeLog
index b598fae..7582b41 100644
--- a/sim/v850/ChangeLog
+++ b/sim/v850/ChangeLog
@@ -2,6 +2,10 @@
 
 	* configure: Regenerate.
 
+2016-01-10  Mike Frysinger  <vapier@gentoo.org>
+
+	* configure: Regenerate.
+
 2016-01-09  Mike Frysinger  <vapier@gentoo.org>
 
 	* config.in, configure: Regenerate.
