[v2,07/10] x86: Do not raise inexact exception on truncl
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redhat-pt-bot/TryBot-apply_patch |
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Commit Message
It is not allowed anymore on ISO C23.
Checked on x86_64-linux-gnu and i686-linux-gnu.
---
.../fpu/s_truncl.S => x86/fpu/s_truncl.c} | 40 +++++++++----------
sysdeps/x86_64/fpu/s_truncl.S | 36 -----------------
2 files changed, 19 insertions(+), 57 deletions(-)
rename sysdeps/{i386/fpu/s_truncl.S => x86/fpu/s_truncl.c} (61%)
delete mode 100644 sysdeps/x86_64/fpu/s_truncl.S
similarity index 61%
rename from sysdeps/i386/fpu/s_truncl.S
rename to sysdeps/x86/fpu/s_truncl.c
@@ -1,5 +1,5 @@
-/* Truncate long double value.
- Copyright (C) 1997-2024 Free Software Foundation, Inc.
+/* Round to integer, toward zero. x86 version.
+ Copyright (C) 2024 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
@@ -16,25 +16,23 @@
License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
+#define NO_MATH_REDIRECT
+#include <math.h>
+#include <fenv_private.h>
#include <libm-alias-ldouble.h>
-#include <machine/asm.h>
-ENTRY(__truncl)
- fldt 4(%esp)
- subl $32, %esp
- cfi_adjust_cfa_offset (32)
- fnstenv 4(%esp)
- movl $0xc00, %edx
- orl 4(%esp), %edx
- movl %edx, (%esp)
- fldcw (%esp)
- frndint
- fnstsw
- andl $0x1, %eax
- orl %eax, 8(%esp)
- fldenv 4(%esp)
- addl $32, %esp
- cfi_adjust_cfa_offset (-32)
- ret
-END(__truncl)
+long double
+__truncl (long double x)
+{
+ fenv_t fenv;
+ long double r;
+
+ libc_feholdexcept_setround_387 (&fenv, FE_TOWARDZERO);
+ asm volatile ("frndint" : "=t" (r) : "0" (x));
+ /* Preserve "invalid" exceptions from sNaN input. */
+ fenv.__status_word |= libc_fetestexcept_387 (FE_INVALID);
+ libc_fesetenv_387 (&fenv);
+
+ return r;
+}
libm_alias_ldouble (__trunc, trunc)
deleted file mode 100644
@@ -1,36 +0,0 @@
-/* Truncate long double value.
- Copyright (C) 1997-2024 Free Software Foundation, Inc.
- This file is part of the GNU C Library.
-
- The GNU C Library is free software; you can redistribute it and/or
- modify it under the terms of the GNU Lesser General Public
- License as published by the Free Software Foundation; either
- version 2.1 of the License, or (at your option) any later version.
-
- The GNU C Library is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- Lesser General Public License for more details.
-
- You should have received a copy of the GNU Lesser General Public
- License along with the GNU C Library; if not, see
- <https://www.gnu.org/licenses/>. */
-
-#include <libm-alias-ldouble.h>
-#include <machine/asm.h>
-
-ENTRY(__truncl)
- fldt 8(%rsp)
- fnstenv -28(%rsp)
- movl $0xc00, %edx
- orl -28(%rsp), %edx
- movl %edx, -32(%rsp)
- fldcw -32(%rsp)
- frndint
- fnstsw
- andl $0x1, %eax
- orl %eax, -24(%rsp)
- fldenv -28(%rsp)
- ret
-END(__truncl)
-libm_alias_ldouble (__trunc, trunc)