http://llvm.org/bugs/show_bug.cgi?id=10580
Summary: [AVX] vector comparisons are scalarized
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]
Given
define <8 x i1> @foo___ff(<8 x float> %a, <8 x float> %b) nounwind readnone {
%bincmp = fcmp olt <8 x float> %a, %b
ret <8 x i1> %bincmp
}
llc -mattr=+avx emits a ton of vector extracts, scalar floating-point compares,
and vector inserts to compute the final result. (The same is true of integer
compares as well.)
It would be nice for it to emit the single corresponding AVX vector compare
instruction instead.
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