* [pushed][PR109052] LRA: Implement commutative operands exchange for combining secondary memory reload and original insn
@ 2023-03-31 15:06 Vladimir Makarov
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From: Vladimir Makarov @ 2023-03-31 15:06 UTC (permalink / raw)
To: gcc-patches
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This is one more patch for
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=109052
The patch adds trying commutative operands exchange for recently
implemented combining secondary memory reload and original insn:
The patch was successfully bootstrapped and tested on x86_64.
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commit 378d19cfebfa2bc4f693dfc9e6f0dd993e7c45f7
Author: Vladimir N. Makarov <vmakarov@redhat.com>
Date: Fri Mar 31 11:04:44 2023 -0400
LRA: Implement commutative operands exchange for combining secondary memory reload and original insn
The patch implements trying commutative operands exchange for
combining secondary memory reload and original insn.
PR rtl-optimization/109052
gcc/ChangeLog:
* lra-constraints.cc: (combine_reload_insn): New function.
gcc/testsuite/ChangeLog:
* gcc.target/i386/pr109052-2.c: New.
diff --git a/gcc/lra-constraints.cc b/gcc/lra-constraints.cc
index 405b8b92f5e..ff4e8f06063 100644
--- a/gcc/lra-constraints.cc
+++ b/gcc/lra-constraints.cc
@@ -5061,7 +5061,23 @@ combine_reload_insn (rtx_insn *from, rtx_insn *to)
curr_insn = to;
curr_id = lra_get_insn_recog_data (curr_insn);
curr_static_id = curr_id->insn_static_data;
- ok_p = !curr_insn_transform (true);
+ for (bool swapped_p = false;;)
+ {
+ ok_p = !curr_insn_transform (true);
+ if (ok_p || curr_static_id->commutative < 0)
+ break;
+ swap_operands (curr_static_id->commutative);
+ if (lra_dump_file != NULL)
+ {
+ fprintf (lra_dump_file,
+ " Swapping %scombined insn operands:\n",
+ swapped_p ? "back " : "");
+ dump_insn_slim (lra_dump_file, to);
+ }
+ if (swapped_p)
+ break;
+ swapped_p = true;
+ }
curr_insn = saved_insn;
curr_id = lra_get_insn_recog_data (curr_insn);
curr_static_id = curr_id->insn_static_data;
diff --git a/gcc/testsuite/gcc.target/i386/pr109052-2.c b/gcc/testsuite/gcc.target/i386/pr109052-2.c
new file mode 100644
index 00000000000..337d1f49c2b
--- /dev/null
+++ b/gcc/testsuite/gcc.target/i386/pr109052-2.c
@@ -0,0 +1,10 @@
+/* { dg-do compile { target { ! ia32 } } } */
+/* { dg-options "-O2 -mfpmath=both -mavx -fno-math-errno" } */
+
+double foo (double a, double b)
+{
+ double z = __builtin_fmod (a, 3.14);
+ return z * b;
+}
+
+/* { dg-final { scan-assembler-not "vmulsd\[ \t]\+%xmm\[0-9]\+, %xmm\[0-9]\+, %xmm\[0-9]\+"} } */
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