48 lines
1.9 KiB
LLVM
48 lines
1.9 KiB
LLVM
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; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --version 3
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; RUN: opt -S -passes=jump-threading < %s | FileCheck %s
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; RUN: opt -S -passes=jump-threading -jump-threading-across-loop-headers < %s | FileCheck %s --check-prefix=THREAD-LOOP
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; FIXME: This is a miscompile if -jump-threading-across-loop-headers is enabled.
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define i64 @test(i64 %v) {
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; CHECK-LABEL: define i64 @test(
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; CHECK-SAME: i64 [[V:%.*]]) {
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; CHECK-NEXT: entry:
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; CHECK-NEXT: [[V_NONNEG:%.*]] = icmp sgt i64 [[V]], -1
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; CHECK-NEXT: br label [[FOR_BODY:%.*]]
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; CHECK: for.body:
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; CHECK-NEXT: [[SUM:%.*]] = phi i64 [ 0, [[ENTRY:%.*]] ], [ [[SUM_NEXT:%.*]], [[FOR_BODY]] ]
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; CHECK-NEXT: [[SUM_NEXT]] = add i64 [[SUM]], [[V]]
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; CHECK-NEXT: [[OVERFLOW:%.*]] = icmp ult i64 [[SUM_NEXT]], [[SUM]]
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; CHECK-NEXT: [[CMP:%.*]] = xor i1 [[V_NONNEG]], [[OVERFLOW]]
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; CHECK-NEXT: br i1 [[CMP]], label [[FOR_BODY]], label [[EXIT:%.*]]
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; CHECK: exit:
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; CHECK-NEXT: ret i64 [[SUM]]
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;
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; THREAD-LOOP-LABEL: define i64 @test(
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; THREAD-LOOP-SAME: i64 [[V:%.*]]) {
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; THREAD-LOOP-NEXT: entry:
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; THREAD-LOOP-NEXT: [[V_NONNEG:%.*]] = icmp sgt i64 [[V]], -1
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; THREAD-LOOP-NEXT: br label [[FOR_BODY:%.*]]
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; THREAD-LOOP: for.body:
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; THREAD-LOOP-NEXT: [[SUM:%.*]] = phi i64 [ 0, [[ENTRY:%.*]] ], [ [[SUM_NEXT:%.*]], [[FOR_BODY]] ]
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; THREAD-LOOP-NEXT: [[SUM_NEXT]] = add i64 [[SUM]], [[V]]
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; THREAD-LOOP-NEXT: [[OVERFLOW:%.*]] = icmp ult i64 [[SUM_NEXT]], [[SUM]]
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; THREAD-LOOP-NEXT: br i1 [[V_NONNEG]], label [[FOR_BODY]], label [[EXIT:%.*]]
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; THREAD-LOOP: exit:
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; THREAD-LOOP-NEXT: ret i64 [[SUM]]
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;
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entry:
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%v.nonneg = icmp sgt i64 %v, -1
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br label %for.body
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for.body:
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%sum = phi i64 [ 0, %entry ], [ %sum.next, %for.body ]
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%sum.next = add i64 %sum, %v
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%overflow = icmp ult i64 %sum.next, %sum
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%cmp = xor i1 %v.nonneg, %overflow
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br i1 %cmp, label %for.body, label %exit
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exit:
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ret i64 %sum
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}
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