From: Li Wei <liwei@loongson.cn>
Date: Mon, 25 Dec 2023 03:20:23 +0000 (+0800)
Subject: LoongArch: Fixed bug in *bstrins_<mode>_for_ior_mask template.
X-Git-Tag: basepoints/gcc-15~3292
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=245c9ef2b8574fcaf277416d5986f46c0babbbec;p=thirdparty%2Fgcc.git

LoongArch: Fixed bug in *bstrins_<mode>_for_ior_mask template.

We found that using the latest compiled gcc will cause a miscompare error
when running spec2006 400.perlbench test with -flto turned on.  After testing,
it was found that only the LoongArch architecture will report errors.
The first error commit was located through the git bisect command as
r14-3773-g5b857e87201335.  Through debugging, it was found that the problem
was that the split condition of the *bstrins_<mode>_for_ior_mask template was
empty, which should actually be consistent with the insn condition.

gcc/ChangeLog:

	* config/loongarch/loongarch.md: Adjust.
---

diff --git a/gcc/config/loongarch/loongarch.md b/gcc/config/loongarch/loongarch.md
index 7021105b2415..2b0609f2f319 100644
--- a/gcc/config/loongarch/loongarch.md
+++ b/gcc/config/loongarch/loongarch.md
@@ -1489,7 +1489,7 @@
   "loongarch_pre_reload_split () && \
    loongarch_use_bstrins_for_ior_with_mask (<MODE>mode, operands)"
   "#"
-  ""
+  "&& true"
   [(set (match_dup 0) (match_dup 1))
    (set (zero_extract:GPR (match_dup 0) (match_dup 2) (match_dup 4))
 	(match_dup 3))]