http://llvm.org/bugs/show_bug.cgi?id=13787
Bug #: 13787
Summary: unnecessary register spill (AVX)
Product: new-bugs
Version: trunk
Platform: PC
OS/Version: All
Status: NEW
Severity: enhancement
Priority: P
Component: new bugs
AssignedTo: [email protected]
ReportedBy: [email protected]
CC: [email protected]
Classification: Unclassified
Created attachment 9177
--> http://llvm.org/bugs/attachment.cgi?id=9177
bitcode
The attached test case seems to have some unnecessary register spills. See,
for example the block LBB0_3, which has the sequence:
vbroadcastss (%r9), %ymm7
[...]
vmovaps %ymm7, 992(%rsp)
[...] # no other changes to %r9
addq $4, %r9
[...] # no uses of %r9
vmovaps 992(%rsp), %ymm13
# % ymm13 is now used...
Unless I'm missing something (and this has happened before...), I believe that
this could be more efficiently done as
vbroadcastss (%r9), %ymm13
addq $4, %r9
# use % ymm13
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