derek.holloway
7502bf64a4
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53 lines
2.0 KiB
LLVM
53 lines
2.0 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --version 6
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; RUN: opt < %s -passes=gvn -S | FileCheck %s
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; loop.then is not reachable from loop, so we should be able to deduce that the
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; store through %phi2 cannot alias %ptr1.
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define void @test1(ptr %ptr1, ptr %ptr2) {
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; CHECK-LABEL: define void @test1(
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; CHECK-SAME: ptr [[PTR1:%.*]], ptr [[PTR2:%.*]]) {
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; CHECK-NEXT: [[ENTRY:.*]]:
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; CHECK-NEXT: [[GEP1:%.*]] = getelementptr inbounds i32, ptr [[PTR1]], i64 1
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; CHECK-NEXT: [[VAL1_PRE:%.*]] = load i32, ptr [[GEP1]], align 4
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; CHECK-NEXT: br label %[[LOOP:.*]]
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; CHECK: [[LOOP]]:
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; CHECK-NEXT: [[PHI1:%.*]] = phi ptr [ [[GEP1]], %[[ENTRY]] ], [ [[PHI2:%.*]], %[[LOOP_THEN:.*]] ]
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; CHECK-NEXT: br i1 false, label %[[LOOP_LOOP_THEN_CRIT_EDGE:.*]], label %[[LOOP_IF:.*]]
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; CHECK: [[LOOP_LOOP_THEN_CRIT_EDGE]]:
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; CHECK-NEXT: br label %[[LOOP_THEN]]
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; CHECK: [[LOOP_IF]]:
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; CHECK-NEXT: [[GEP2:%.*]] = getelementptr inbounds i32, ptr [[GEP1]], i64 1
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; CHECK-NEXT: [[VAL2:%.*]] = load i32, ptr [[GEP2]], align 4
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; CHECK-NEXT: [[CMP:%.*]] = icmp slt i32 [[VAL1_PRE]], [[VAL2]]
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; CHECK-NEXT: br label %[[LOOP_THEN]]
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; CHECK: [[LOOP_THEN]]:
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; CHECK-NEXT: [[PHI2]] = phi ptr [ poison, %[[LOOP_LOOP_THEN_CRIT_EDGE]] ], [ [[GEP2]], %[[LOOP_IF]] ]
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; CHECK-NEXT: store i32 [[VAL1_PRE]], ptr [[PHI2]], align 4
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; CHECK-NEXT: store i32 0, ptr [[PTR1]], align 4
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; CHECK-NEXT: br label %[[LOOP]]
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;
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entry:
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br label %loop.preheader
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loop.preheader:
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%gep1 = getelementptr inbounds i32, ptr %ptr1, i64 1
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br label %loop
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loop:
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%phi1 = phi ptr [ %gep1, %loop.preheader ], [ %phi2, %loop.then ]
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%val1 = load i32, ptr %phi1
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br i1 false, label %loop.then, label %loop.if
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loop.if:
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%gep2 = getelementptr inbounds i32, ptr %gep1, i64 1
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%val2 = load i32, ptr %gep2
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%cmp = icmp slt i32 %val1, %val2
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br label %loop.then
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loop.then:
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%phi2 = phi ptr [ %ptr2, %loop ], [ %gep2, %loop.if ]
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store i32 %val1, ptr %phi2
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store i32 0, ptr %ptr1
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br label %loop
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}
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