http://llvm.org/bugs/show_bug.cgi?id=11031
Summary: [AVX,perf] %rbp unnecessarily saved and restored in
simple function
Product: new-bugs
Version: trunk
Platform: PC
OS/Version: All
Status: NEW
Severity: normal
Priority: P
Component: new bugs
AssignedTo: [email protected]
ReportedBy: [email protected]
CC: [email protected]
Created an attachment (id=7370)
--> (http://llvm.org/bugs/attachment.cgi?id=7370)
test case
With the attached example, llc -mattr=+avx generates the following assembly. I
believe that the initial pushq/movq and the ending popq are unnecessary.
_Floor2Int___f: ## @Floor2Int___f
## BB#0: ## %allocas
pushq %rbp
movq %rsp, %rbp
vroundps $9, %ymm0, %ymm2
vxorps %ymm0, %ymm0, %ymm0
vblendvps %ymm1, %ymm2, %ymm0, %ymm2
vcvttps2dq %ymm2, %ymm2
vblendvps %ymm1, %ymm2, %ymm0, %ymm0
popq %rbp
ret
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