https://llvm.org/bugs/show_bug.cgi?id=31309
Bug ID: 31309
Summary: Failure to combine scalar load+zext into vector
load+zext
Product: libraries
Version: trunk
Hardware: PC
OS: Windows NT
Status: NEW
Severity: normal
Priority: P
Component: Backend: X86
Assignee: unassignedb...@nondot.org
Reporter: llvm-...@redking.me.uk
CC: llvm-bugs@lists.llvm.org
Classification: Unclassified
define <4 x i32> @load_i32_zext_i128_v4i32(i32* %in) {
%1 = load i32, i32* %in
%2 = zext i32 %1 to i128
%3 = bitcast i128 %2 to <4 x i32>
ret <4 x i32> %3
}
Current output:
load_i32_zext_i128_v4i32:
movl (%rdi), %eax
vmovq %rax, %xmm0
retq
It would be better if we managed:
load_i32_zext_i128_v4i32:
vmovd (%rdi), %xmm0
retq
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