[1/2] Improve/Fix (m1 CMP m2) * d -> (m1 CMP m2) ? d : 0 pattern.
Commit Message
From: Andrew Pinski <apinski@marvell.com>
The pattern here was not catching all comparisons and the multiply
was not commutative when it should have been. This patches fixes
that by using tcc_comparison and adding :c to the multiply.
OK? Bootstrapped and tested on x86_64-linux-gnu with no regressions.
gcc/ChangeLog:
* match.pd ((m1 CMP m2) * d -> (m1 CMP m2) ? d : 0):
Use tcc_comparison and :c for the multiply.
gcc/testsuite/ChangeLog:
* gcc.dg/tree-ssa/multcmp-1.c: New test.
* gcc.dg/tree-ssa/multcmp-2.c: New test.
---
gcc/match.pd | 4 ++--
gcc/testsuite/gcc.dg/tree-ssa/multcmp-1.c | 12 ++++++++++++
gcc/testsuite/gcc.dg/tree-ssa/multcmp-2.c | 12 ++++++++++++
3 files changed, 26 insertions(+), 2 deletions(-)
create mode 100644 gcc/testsuite/gcc.dg/tree-ssa/multcmp-1.c
create mode 100644 gcc/testsuite/gcc.dg/tree-ssa/multcmp-2.c
Comments
On Mon, Nov 22, 2021 at 7:25 AM apinski--- via Gcc-patches
<gcc-patches@gcc.gnu.org> wrote:
>
> From: Andrew Pinski <apinski@marvell.com>
>
> The pattern here was not catching all comparisons and the multiply
> was not commutative when it should have been. This patches fixes
> that by using tcc_comparison and adding :c to the multiply.
>
> OK? Bootstrapped and tested on x86_64-linux-gnu with no regressions.
OK.
Thanks,
Richard.
> gcc/ChangeLog:
>
> * match.pd ((m1 CMP m2) * d -> (m1 CMP m2) ? d : 0):
> Use tcc_comparison and :c for the multiply.
>
> gcc/testsuite/ChangeLog:
>
> * gcc.dg/tree-ssa/multcmp-1.c: New test.
> * gcc.dg/tree-ssa/multcmp-2.c: New test.
> ---
> gcc/match.pd | 4 ++--
> gcc/testsuite/gcc.dg/tree-ssa/multcmp-1.c | 12 ++++++++++++
> gcc/testsuite/gcc.dg/tree-ssa/multcmp-2.c | 12 ++++++++++++
> 3 files changed, 26 insertions(+), 2 deletions(-)
> create mode 100644 gcc/testsuite/gcc.dg/tree-ssa/multcmp-1.c
> create mode 100644 gcc/testsuite/gcc.dg/tree-ssa/multcmp-2.c
>
> diff --git a/gcc/match.pd b/gcc/match.pd
> index ca6c9eff624..ed43c321cbc 100644
> --- a/gcc/match.pd
> +++ b/gcc/match.pd
> @@ -1791,9 +1791,9 @@ DEFINE_INT_AND_FLOAT_ROUND_FN (RINT)
>
> /* (m1 CMP m2) * d -> (m1 CMP m2) ? d : 0 */
> (if (!canonicalize_math_p ())
> - (for cmp (gt lt ge le)
> + (for cmp (tcc_comparison)
> (simplify
> - (mult (convert (cmp @0 @1)) @2)
> + (mult:c (convert (cmp @0 @1)) @2)
> (cond (cmp @0 @1) @2 { build_zero_cst (type); }))))
>
> /* For integral types with undefined overflow and C != 0 fold
> diff --git a/gcc/testsuite/gcc.dg/tree-ssa/multcmp-1.c b/gcc/testsuite/gcc.dg/tree-ssa/multcmp-1.c
> new file mode 100644
> index 00000000000..fb44cacde77
> --- /dev/null
> +++ b/gcc/testsuite/gcc.dg/tree-ssa/multcmp-1.c
> @@ -0,0 +1,12 @@
> +/* { dg-do compile } */
> +/* { dg-options "-O2 -fdump-tree-optimized" } */
> +
> +int
> +f (int m1, int m2, int c)
> +{
> + int d = m1 == m2;
> + int e = d * c;
> + return e;
> +}
> +
> +/* { dg-final { scan-tree-dump-times "\\? c_\[0-9\]\\(D\\) : 0" 1 "optimized" } } */
> diff --git a/gcc/testsuite/gcc.dg/tree-ssa/multcmp-2.c b/gcc/testsuite/gcc.dg/tree-ssa/multcmp-2.c
> new file mode 100644
> index 00000000000..be38b2e0044
> --- /dev/null
> +++ b/gcc/testsuite/gcc.dg/tree-ssa/multcmp-2.c
> @@ -0,0 +1,12 @@
> +/* { dg-do compile } */
> +/* { dg-options "-O2 -fdump-tree-optimized" } */
> +
> +int
> +f (int m1, int m2, int c)
> +{
> + int d = m1 != m2;
> + int e = c * d;
> + return e;
> +}
> +
> +/* { dg-final { scan-tree-dump-times "\\? c_\[0-9\]\\(D\\) : 0" 1 "optimized" } } */
> --
> 2.17.1
>
@@ -1791,9 +1791,9 @@ DEFINE_INT_AND_FLOAT_ROUND_FN (RINT)
/* (m1 CMP m2) * d -> (m1 CMP m2) ? d : 0 */
(if (!canonicalize_math_p ())
- (for cmp (gt lt ge le)
+ (for cmp (tcc_comparison)
(simplify
- (mult (convert (cmp @0 @1)) @2)
+ (mult:c (convert (cmp @0 @1)) @2)
(cond (cmp @0 @1) @2 { build_zero_cst (type); }))))
/* For integral types with undefined overflow and C != 0 fold
new file mode 100644
@@ -0,0 +1,12 @@
+/* { dg-do compile } */
+/* { dg-options "-O2 -fdump-tree-optimized" } */
+
+int
+f (int m1, int m2, int c)
+{
+ int d = m1 == m2;
+ int e = d * c;
+ return e;
+}
+
+/* { dg-final { scan-tree-dump-times "\\? c_\[0-9\]\\(D\\) : 0" 1 "optimized" } } */
new file mode 100644
@@ -0,0 +1,12 @@
+/* { dg-do compile } */
+/* { dg-options "-O2 -fdump-tree-optimized" } */
+
+int
+f (int m1, int m2, int c)
+{
+ int d = m1 != m2;
+ int e = c * d;
+ return e;
+}
+
+/* { dg-final { scan-tree-dump-times "\\? c_\[0-9\]\\(D\\) : 0" 1 "optimized" } } */