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re PR target/90568 (stack protector should use cmp or sub, not xor, to allow macro-fusion on x86)

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PR target/90568
	* config/i386/i386.md (stack_protect_test_<mode>): Use sub instead
	of xor.

From-SVN: r271552
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Jakub Jelinek 2019-05-23 13:18:41 +02:00 committed by Jakub Jelinek
parent 2b8235ea99
commit 32d941139e
2 changed files with 7 additions and 1 deletions
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6
gcc/ChangeLog
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@ -1,3 +1,9 @@
2019-05-23 Jakub Jelinek <jakub@redhat.com>
PR target/90568
* config/i386/i386.md (stack_protect_test_<mode>): Use sub instead
of xor.
2019-05-23 Martin Liska <mliska@suse.cz>
PR sanitizer/90570

2
gcc/config/i386/i386.md
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@ -19521,7 +19521,7 @@
UNSPEC_SP_TEST))
(clobber (match_scratch:PTR 3 "=&r"))]
""
"mov{<imodesuffix>}\t{%1, %3|%3, %1}\;xor{<imodesuffix>}\t{%2, %3|%3, %2}"
"mov{<imodesuffix>}\t{%1, %3|%3, %1}\;sub{<imodesuffix>}\t{%2, %3|%3, %2}"
[(set_attr "type" "multi")])
(define_insn "sse4_2_crc32<mode>"