https://gcc.gnu.org/g:a9ac3759711d5b6c6d8bba452dd40ba2cde4284f
commit a9ac3759711d5b6c6d8bba452dd40ba2cde4284f
Author: Alexandre Oliva <ol...@adacore.com>
Date: Thu May 8 02:17:58 2025 -0300
[testsuite] [ppc] add -mdejagnu-cpu=power7 to pr17381.c
Below power7, it seems to be more profitable to compress the
floating-point constants and use an additional fp register move to
"extend" it. Only at power7 and above do we keep the constants
separate and load them, getting to the expected 'fmr' count.
for gcc/testsuite/ChangeLog
* gcc.target/powerpc/pr17381.c: Compile for power7. Justify.
Diff:
---
gcc/testsuite/gcc.target/powerpc/pr17381.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/gcc/testsuite/gcc.target/powerpc/pr17381.c
b/gcc/testsuite/gcc.target/powerpc/pr17381.c
index e6222c130af1..b137c687776e 100644
--- a/gcc/testsuite/gcc.target/powerpc/pr17381.c
+++ b/gcc/testsuite/gcc.target/powerpc/pr17381.c
@@ -1,6 +1,8 @@
/* PR target/17381 - Unnecessary register move for float extend */
/* { dg-do compile } */
-/* { dg-options "-O2" } */
+/* { dg-options "-mdejagnu-cpu=power7 -O2" } */
+/* Up to power6, we compress the floating-point constant 1.0 and share it with
+ 1.0f, but the float_extend comes out as a second fmr. */
double d;
float test1(float fParm)
