http://llvm.org/bugs/show_bug.cgi?id=22024
Bug ID: 22024
Summary: Unnecessary vxorps instructions
Product: libraries
Version: trunk
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P
Component: Backend: X86
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
Classification: Unclassified
Created attachment 13590
--> http://llvm.org/bugs/attachment.cgi?id=13590&action=edit
Test case
For the following code:
void foo(float *A, float *B, long x, long y) {
*B = y;
*A = x;
}
gcc -S -o - /tmp/test.c -O3 -mavx
vcvtsi2ssq %rcx, %xmm0, %xmm0
vmovss %xmm0, (%rsi)
vcvtsi2ssq %rdx, %xmm0, %xmm0
vmovss %xmm0, (%rdi)
ret
clang -S -o - /tmp/test.c -O3 -mavx
vcvtsi2ssq %rcx, %xmm0, %xmm0
vmovss %xmm0, (%rsi)
vxorps %xmm0, %xmm0, %xmm0
vcvtsi2ssq %rdx, %xmm0, %xmm0
vmovss %xmm0, (%rdi)
retq
The vxorps instruction is unnecessary.
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