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* [gcc r14-172] Use NO_REGS in cost calculation when the preferred register class are not known yet.
@ 2023-04-23 1:57 hongtao Liu
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From: hongtao Liu @ 2023-04-23 1:57 UTC (permalink / raw)
To: gcc-cvs
https://gcc.gnu.org/g:0368d169492017cfab5622d38b15be94154d458c
commit r14-172-g0368d169492017cfab5622d38b15be94154d458c
Author: liuhongt <hongtao.liu@intel.com>
Date: Wed Feb 8 12:42:27 2023 +0800
Use NO_REGS in cost calculation when the preferred register class are not known yet.
gcc/ChangeLog:
PR rtl-optimization/108707
* ira-costs.cc (scan_one_insn): Use NO_REGS instead of
GENERAL_REGS when preferred reg_class is not known.
gcc/testsuite/ChangeLog:
* gcc.target/i386/pr108707.c: New test.
Diff:
---
gcc/ira-costs.cc | 5 ++++-
gcc/testsuite/gcc.target/i386/pr108707.c | 16 ++++++++++++++++
2 files changed, 20 insertions(+), 1 deletion(-)
diff --git a/gcc/ira-costs.cc b/gcc/ira-costs.cc
index c0fdef807dd..d2a801ab9b0 100644
--- a/gcc/ira-costs.cc
+++ b/gcc/ira-costs.cc
@@ -1572,7 +1572,10 @@ scan_one_insn (rtx_insn *insn)
&& (! ira_use_lra_p || ! pic_offset_table_rtx
|| ! contains_symbol_ref_p (XEXP (note, 0))))
{
- enum reg_class cl = GENERAL_REGS;
+ /* Costs for NO_REGS are used in cost calculation on the
+ 1st pass when the preferred register classes are not
+ known yet. In this case we take the best scenario. */
+ enum reg_class cl = NO_REGS;
rtx reg = SET_DEST (set);
int num = COST_INDEX (REGNO (reg));
diff --git a/gcc/testsuite/gcc.target/i386/pr108707.c b/gcc/testsuite/gcc.target/i386/pr108707.c
new file mode 100644
index 00000000000..6405cfe7cdc
--- /dev/null
+++ b/gcc/testsuite/gcc.target/i386/pr108707.c
@@ -0,0 +1,16 @@
+/* { dg-do compile } */
+/* { dg-options "-mavx512f -O2" } */
+/* { dg-final { scan-assembler-not {(?n)vfmadd[1-3]*ps.*\(} { target { ! ia32 } } } } */
+/* { dg-final { scan-assembler-times {(?n)vfmadd[1-3]*ps[ \t]*} 3 } } */
+
+#include<immintrin.h>
+
+void
+foo (__m512 pv, __m512 a, __m512 b, __m512 c,
+ __m512* pdest, __m512* p1)
+{
+ __m512 t = *p1;
+ pdest[0] = _mm512_fmadd_ps (t, pv, a);
+ pdest[1] = _mm512_fmadd_ps (t, pv, b);
+ pdest[2] = _mm512_fmadd_ps (t, pv, c);
+}
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