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3 Commits

Author SHA1 Message Date
Matt Morehouse e62fc3d0b6 [InstCombine] Disable strcmp->memcmp transform for MSan. 
Summary:
The strcmp->memcmp transform can make the resulting memcmp read
uninitialized data, which MSan doesn't like.

Resolves https://github.com/google/sanitizers/issues/993.

Reviewers: eugenis, xbolva00

Reviewed By: eugenis

Subscribers: hiraditya, llvm-commits

Differential Revision: https://reviews.llvm.org/D52272

llvm-svn: 342582
 2018-09-19 19:37:24 +00:00
David Bolvansky 909889b2cb [InstCombine] Transform str(n)cmp to memcmp 
Summary:
Motivation examples:
int strcmp_memcmp() {
    char buf[12];
    return strcmp(buf, "key") == 0;
}

int strcmp_memcmp2() {
    char buf[12];
    return strcmp(buf, "key") != 0;
}

int strncmp_memcmp() {
    char buf[12];
    return strncmp(buf, "key", 3) == 0;
}

can be turned to memcmp.

See test file for more cases.

Reviewers: efriedma

Reviewed By: efriedma

Subscribers: spatel, llvm-commits

Differential Revision: https://reviews.llvm.org/D50233

llvm-svn: 339410
 2018-08-10 04:32:54 +00:00
David Bolvansky b82a5ec1b6 [InstCombine] [NFC] Tests for strcmp to memcmp transformation 
llvm-svn: 338963
 2018-08-05 05:46:56 +00:00