https://bugs.llvm.org/show_bug.cgi?id=42616
Bug ID: 42616
Summary: Regression since "[X86] Add MOVSDrr->MOVLPDrm entry to
load folding table. Add custom handling to turn
UNPCKLPDrr->MOVHPDrm when load is under aligned."
Product: libraries
Version: trunk
Hardware: PC
OS: All
Status: NEW
Severity: enhancement
Priority: P
Component: Backend: X86
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected], [email protected],
[email protected], [email protected],
[email protected]
Created attachment 22243
--> https://bugs.llvm.org/attachment.cgi?id=22243&action=edit
Reproduction source code
Since SVN r365287, "[X86] Add MOVSDrr->MOVLPDrm entry to load folding table.
Add custom handling to turn UNPCKLPDrr->MOVHPDrm when load is under aligned.",
some code seems to be miscompiled, failing tests.
I haven't yet been able to pinpoint what the issue is, but if building the
libav project (https://git.libav.org/?p=libav.git) for i686-w64-mingw32 with
clang, the mp3 float decoder tests start failing:
https://fate.libav.org/i686-mingw32-clang-trunk
The failure is isolated to one single source file (attached in preprocessed
form); if compiled as "clang -target i686-w64-mingw32 -c -O3
mpegaudiodec_float-preproc.c -o libavcodec/mpegaudiodec_float.o", it fails
tests if built with a compiler past this commit, and succeeds all tests if
built with the older compiler version.
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