https://llvm.org/bugs/show_bug.cgi?id=30981
Bug ID: 30981
Summary: AVX512: FastISel generates invalid seto
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], [email protected],
[email protected], [email protected]
Classification: Unclassified
For this IR:
define i64 @foo(i64 %arg) {
bb:
%tmp1 = tail call { i64, i1 } @llvm.umul.with.overflow.i64(i64 %arg, i64 4)
%tmp2 = extractvalue { i64, i1 } %tmp1, 1
%tmp3 = select i1 %tmp2, i64 -1, i64 %arg
ret i64 %tmp3
}
; Function Attrs: nounwind readnone
declare { i64, i1 } @llvm.umul.with.overflow.i64(i64, i64)
Compiling for AVX512 with -O0 we get:
$ bin/llc ~/llvm/temp/badnew.ll -O0 -o - -mattr=+avx512f
[...]
movq %rdi, %rax
mulq %rdx
seto %k0
[...]
seto %k0 looks like a nonsense instruction, and ends up getting encoded as seto
%al.
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