e80fcf0340
[SimplifyLibCalls] Mark known arguments with nonnull
...
Reviewers: efriedma, jdoerfert
Reviewed By: jdoerfert
Subscribers: ychen, rsmith, joerg, aaron.ballman, lebedev.ri, uenoku, jdoerfert, hfinkel, javed.absar, spatel, dmgreen, llvm-commits
Differential Revision: https://reviews.llvm.org/D53342
llvm-svn: 372091
2019-09-17 09:32:52 +00:00
39130314fe
[SimplifyLibCalls] Add dereferenceable bytes from known callsites
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Summary:
int mm(char *a, char *b) {
return memcmp(a,b,16);
}
Currently:
define dso_local i32 @mm(i8* nocapture readonly %a, i8* nocapture readonly %b) local_unnamed_addr #1 {
entry:
%call = tail call i32 @memcmp(i8* %a, i8* %b, i64 16)
ret i32 %call
}
After patch:
define dso_local i32 @mm(i8* nocapture readonly %a, i8* nocapture readonly %b) local_unnamed_addr #1 {
entry:
%call = tail call i32 @memcmp(i8* dereferenceable(16) %a, i8* dereferenceable(16) %b, i64 16)
ret i32 %call
}
Reviewers: jdoerfert, efriedma
Reviewed By: jdoerfert
Subscribers: javed.absar, spatel, llvm-commits
Tags: #llvm
Differential Revision: https://reviews.llvm.org/D66079
llvm-svn: 368657
2019-08-13 09:11:49 +00:00
cee313d288
Revert "Temporarily Revert "Add basic loop fusion pass.""
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The reversion apparently deleted the test/Transforms directory.
Will be re-reverting again.
llvm-svn: 358552
2019-04-17 04:52:47 +00:00
a863435128
Temporarily Revert "Add basic loop fusion pass."
...
As it's causing some bot failures (and per request from kbarton).
This reverts commit r358543/ab70da07286e618016e78247e4a24fcb84077fda.
llvm-svn: 358546
2019-04-17 02:12:23 +00:00
e62fc3d0b6
[InstCombine] Disable strcmp->memcmp transform for MSan.
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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
909889b2cb
[InstCombine] Transform str(n)cmp to memcmp
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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
b82a5ec1b6
[InstCombine] [NFC] Tests for strcmp to memcmp transformation
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llvm-svn: 338963
2018-08-05 05:46:56 +00:00
David Bolvansky