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| author | Bill Wendling <isanbard@gmail.com> | 2013-12-20 04:29:56 +0000 |
|---|---|---|
| committer | Bill Wendling <isanbard@gmail.com> | 2013-12-20 04:29:56 +0000 |
| commit | 2ca55e9ced49ee958be65020998e95c6019e42ab (patch) | |
| tree | b42394ae9021f036c3665a2aa52a50529f6ea3be /docs/ReleaseNotes.rst | |
| parent | b95f36183ccbb26154accc99fd304f6e04075682 (diff) | |
| download | llvm-2ca55e9ced49ee958be65020998e95c6019e42ab.tar.gz llvm-2ca55e9ced49ee958be65020998e95c6019e42ab.tar.bz2 llvm-2ca55e9ced49ee958be65020998e95c6019e42ab.tar.xz | |
Merging r197492:
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r197492 | dyatkovskiy | 2013-12-17 04:07:33 -0800 (Tue, 17 Dec 2013) | 26 lines
Fix for PR18045:
http://llvm.org/bugs/show_bug.cgi?id=18045
Short issue description:
For X86 machines with sse < sse4.1 we got failures for some
particular load/store vector sequences:
$ clang-trunk -m32 -O2 test-case.c
fatal error: error in backend: Cannot select: 0x4200920: v4i32,ch = load 0x41d6ab0, 0x4205850,
0x41dcb10<LD16[getelementptr inbounds ([4 x i32]* @e, i32 0, i32 0)](align=4)> [ORD=82]
[ID=58]
0x4205850: i32 = X86ISD::Wrapper 0x41d5490 [ORD=26] [ID=43]
0x41d5490: i32 = TargetGlobalAddress<[4 x i32]* @e> 0 [ORD=26] [ID=23]
0x41dcb10: i32 = undef [ID=2]
The reason is that EltsFromConsecutiveLoads could emit such load instruction
both before and after legalize stage. Though this instruction is not legal for
machines with SSSE3 and lower.
The fix: In EltsFromConsecutiveLoads, if we have passed legalize stage, we
check whether nodes it emits are legal.
P.S.: If you get failure in time from 12:00 and till 22:00 (UTC-8),
perhaps I'll slow with response, so you better reject this commit. Thanks!
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git-svn-id: https://llvm.org/svn/llvm-project/llvm/branches/release_34@197779 91177308-0d34-0410-b5e6-96231b3b80d8
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