derek.holloway
7502bf64a4
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42 lines
1.1 KiB
LLVM
42 lines
1.1 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --version 2
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; RUN: opt -S -passes=jump-threading < %s | FileCheck %s
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; Make sure this does not crash due to conflicting known bits.
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define i32 @test() {
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; CHECK-LABEL: define i32 @test() {
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; CHECK-NEXT: join.thread:
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; CHECK-NEXT: br label [[END:%.*]]
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; CHECK: unreachable:
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; CHECK-NEXT: [[SH_PROM:%.*]] = zext i32 -1 to i64
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; CHECK-NEXT: [[SHL:%.*]] = shl nsw i64 -1, [[SH_PROM]]
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; CHECK-NEXT: [[CONV:%.*]] = trunc i64 [[SHL]] to i32
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; CHECK-NEXT: br label [[JOIN:%.*]]
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; CHECK: join:
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; CHECK-NEXT: [[PHI:%.*]] = phi i32 [ [[CONV]], [[UNREACHABLE:%.*]] ]
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; CHECK-NEXT: [[CMP:%.*]] = icmp eq i32 [[PHI]], 0
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; CHECK-NEXT: br i1 [[CMP]], label [[END]], label [[END]]
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; CHECK: end:
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; CHECK-NEXT: ret i32 0
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;
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entry:
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br label %join
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unreachable:
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%sh_prom = zext i32 -1 to i64
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%shl = shl nsw i64 -1, %sh_prom
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%conv = trunc i64 %shl to i32
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br label %join
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join:
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%phi = phi i32 [ %conv, %unreachable ], [ 0, %entry ]
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%cmp = icmp eq i32 %phi, 0
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br i1 %cmp, label %end, label %if
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if:
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br label %end
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end:
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ret i32 0
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}
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