13ffde316a
Remove compares after replacing all uses. Cleaning dead compares can enable additional simplifications when adjusting the position of the pass slightly. In particular, it seems like the additional dead instructions may prevent SimplifyCFG performing some folds. Reviewed By: nikic Differential Revision: https://reviews.llvm.org/D158760
37 lines
909 B
LLVM
37 lines
909 B
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
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; RUN: opt -passes=constraint-elimination -S %s | FileCheck %s
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declare void @use(i1)
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define void @test(ptr %m, ptr %ptr) {
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; CHECK-LABEL: @test(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: [[CMP_1:%.*]] = icmp ult ptr [[M:%.*]], [[PTR:%.*]]
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; CHECK-NEXT: br i1 [[CMP_1]], label [[BB_1:%.*]], label [[BB_2:%.*]]
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; CHECK: bb.1:
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; CHECK-NEXT: call void @use(i1 false)
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; CHECK-NEXT: ret void
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; CHECK: bb.2:
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; CHECK-NEXT: br label [[BB_2_NEXT:%.*]]
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; CHECK: bb.2.next:
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; CHECK-NEXT: call void @use(i1 true)
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; CHECK-NEXT: ret void
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;
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entry:
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%cmp.1 = icmp ult ptr %m, %ptr
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br i1 %cmp.1, label %bb.1, label %bb.2
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bb.1:
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%cmp.2 = icmp uge ptr %m, %ptr
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call void @use(i1 %cmp.2)
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ret void
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bb.2:
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br label %bb.2.next
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bb.2.next:
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%cmp.3 = icmp uge ptr %m, %ptr
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call void @use(i1 %cmp.3)
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ret void
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}
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