derek.holloway
7502bf64a4
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23 lines
997 B
LLVM
23 lines
997 B
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --version 2
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; RUN: opt < %s -passes=instcombine -S | FileCheck %s
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; Check we don't have sub-optimal codegen due to min/max idiom breakage.
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; On AArch64, these constants are also expensive to materialize,
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; and therefore generate poor code vs maintaining the min/max idiom.
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define i64 @dont_break_minmax_i64(i64 %conv, i64 %conv2) {
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; CHECK-LABEL: define i64 @dont_break_minmax_i64
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; CHECK-SAME: (i64 [[CONV:%.*]], i64 [[CONV2:%.*]]) {
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; CHECK-NEXT: [[MUL:%.*]] = mul nsw i64 [[CONV]], [[CONV2]]
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; CHECK-NEXT: [[SHR:%.*]] = ashr i64 [[MUL]], 4
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; CHECK-NEXT: [[SPEC_SELECT_I:%.*]] = call i64 @llvm.smin.i64(i64 [[SHR]], i64 348731)
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; CHECK-NEXT: ret i64 [[SPEC_SELECT_I]]
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;
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%mul = mul nsw i64 %conv, %conv2
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%shr = ashr i64 %mul, 4
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%cmp4.i = icmp sgt i64 %shr, 348731
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%switch.i = icmp ult i1 %cmp4.i, true
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%spec.select.i = select i1 %switch.i, i64 %shr, i64 348731
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ret i64 %spec.select.i
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}
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