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9f9d5e9617
When converting a switch with two cases and a default into a select, also handle the denegerate case where two cases have the same value. Generate this case directly as %or = or i1 %cmp1, %cmp2 %res = select i1 %or, i32 %val, i32 %default rather than %sel1 = select i1 %cmp1, i32 %val, i32 %default %res = select i1 %cmp2, i32 %val, i32 %sel1 as InstCombine is going to canonicalize to the former anyway.
31 lines
805 B
LLVM
31 lines
805 B
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
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; RUN: opt -O1 -S < %s | FileCheck %s
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; This is a very convoluted way to write an icmp ule, which comes about by
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; matching against a three-way comparison result.
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define i1 @ule(i32 %a, i32 %b) {
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; CHECK-LABEL: @ule(
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; CHECK-NEXT: start:
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; CHECK-NEXT: [[DOTNOT:%.*]] = icmp ule i32 [[A:%.*]], [[B:%.*]]
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; CHECK-NEXT: ret i1 [[DOTNOT]]
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;
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start:
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%cmp1 = icmp eq i32 %a, %b
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%cmp2 = icmp ult i32 %a, %b
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%cmp3 = icmp ne i32 %a, %b
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%zext = zext i1 %cmp3 to i64
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%sel1 = select i1 %cmp2, i64 -1, i64 %zext
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%sel2 = select i1 %cmp1, i64 0, i64 %sel1
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switch i64 %sel2, label %exit [
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i64 -1, label %bb
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i64 0, label %bb
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]
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bb:
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br label %exit
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exit:
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%res = phi i1 [ true, %bb ], [ false, %start ]
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ret i1 %res
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}
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