http://llvm.org/bugs/show_bug.cgi?id=14866
Bug #: 14866
Summary: AVX: Trunc of <8 x i32> to <8 x i32> is inefficient.
Product: libraries
Version: trunk
Platform: PC
OS/Version: All
Status: NEW
Severity: enhancement
Priority: P
Component: Backend: X86
AssignedTo: [email protected]
ReportedBy: [email protected]
CC: [email protected]
Classification: Unclassified
The following code is inefficient on corei7-avx. It should be done with two
shuffles and a blend.
%T0_39 = type <8 x i32>
%T1_39 = type <8 x i16>
define void @func39() {
%v0 = load %T0_39* undef
%r = trunc %T0_39 %v0 to %T1_39
store %T1_39 %r, %T1_39* undef
ret void
}
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