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7dcf1654f8
Based ontop of D104598, which is a NFCI-ish refactoring. Here, a restriction, that only empty blocks can be merged, is lifted. Reviewed By: rnk Differential Revision: https://reviews.llvm.org/D104597
42 lines
1.1 KiB
LLVM
42 lines
1.1 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
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; RUN: opt < %s -simplifycfg -simplifycfg-require-and-preserve-domtree=1 -S | FileCheck %s
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; Check that simplifycfg deletes a dead 'seteq' instruction when it
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; folds a conditional branch into a switch instruction.
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declare void @foo()
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declare void @bar()
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define void @testcfg(i32 %V) {
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; CHECK-LABEL: @testcfg(
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; CHECK-NEXT: [[V_OFF:%.*]] = add i32 [[V:%.*]], -15
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; CHECK-NEXT: [[SWITCH:%.*]] = icmp ult i32 [[V_OFF]], 2
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; CHECK-NEXT: br i1 [[SWITCH]], label [[L2:%.*]], label [[L1:%.*]]
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; CHECK: common.ret:
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; CHECK-NEXT: ret void
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; CHECK: L1:
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; CHECK-NEXT: call void @foo()
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; CHECK-NEXT: br label [[COMMON_RET:%.*]]
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; CHECK: L2:
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; CHECK-NEXT: call void @bar()
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; CHECK-NEXT: br label [[COMMON_RET]]
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;
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%C = icmp eq i32 %V, 18
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%D = icmp eq i32 %V, 180
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%E = or i1 %C, %D
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br i1 %E, label %L1, label %Sw
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Sw: ; preds = %0
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switch i32 %V, label %L1 [
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i32 15, label %L2
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i32 16, label %L2
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]
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L1: ; preds = %Sw, %0
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call void @foo( )
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ret void
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L2: ; preds = %Sw, %Sw
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call void @bar( )
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ret void
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}
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