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- ; RUN: opt < %s -loop-unswitch -verify-loop-info -S < %s 2>&1 | FileCheck %s
- define i32 @test(i32* %A, i1 %C) {
- entry:
- br label %no_exit
- no_exit: ; preds = %no_exit.backedge, %entry
- %i.0.0 = phi i32 [ 0, %entry ], [ %i.0.0.be, %no_exit.backedge ] ; <i32> [#uses=3]
- %gep.upgrd.1 = zext i32 %i.0.0 to i64 ; <i64> [#uses=1]
- %tmp.7 = getelementptr i32, i32* %A, i64 %gep.upgrd.1 ; <i32*> [#uses=4]
- %tmp.13 = load i32, i32* %tmp.7 ; <i32> [#uses=2]
- %tmp.14 = add i32 %tmp.13, 1 ; <i32> [#uses=1]
- store i32 %tmp.14, i32* %tmp.7
- br i1 %C, label %then, label %endif
- then: ; preds = %no_exit
- %tmp.29 = load i32, i32* %tmp.7 ; <i32> [#uses=1]
- %tmp.30 = add i32 %tmp.29, 2 ; <i32> [#uses=1]
- store i32 %tmp.30, i32* %tmp.7
- %inc9 = add i32 %i.0.0, 1 ; <i32> [#uses=2]
- %tmp.112 = icmp ult i32 %inc9, 100000 ; <i1> [#uses=1]
- br i1 %tmp.112, label %no_exit.backedge, label %return
- no_exit.backedge: ; preds = %endif, %then
- %i.0.0.be = phi i32 [ %inc9, %then ], [ %inc, %endif ] ; <i32> [#uses=1]
- br label %no_exit
- endif: ; preds = %no_exit
- %inc = add i32 %i.0.0, 1 ; <i32> [#uses=2]
- %tmp.1 = icmp ult i32 %inc, 100000 ; <i1> [#uses=1]
- br i1 %tmp.1, label %no_exit.backedge, label %return
- return: ; preds = %endif, %then
- ret i32 %tmp.13
- }
- ; This simple test would normally unswitch, but should be inhibited by the presence of
- ; the noduplicate call.
- ; CHECK-LABEL: @test2(
- define i32 @test2(i32* %var) {
- %mem = alloca i32
- store i32 2, i32* %mem
- %c = load i32, i32* %mem
- br label %loop_begin
- loop_begin:
- %var_val = load i32, i32* %var
- switch i32 %c, label %default [
- i32 1, label %inc
- i32 2, label %dec
- ]
- inc:
- call void @incf() noreturn nounwind
- br label %loop_begin
- dec:
- ; CHECK: call void @decf()
- ; CHECK-NOT: call void @decf()
- call void @decf() noreturn nounwind noduplicate
- br label %loop_begin
- default:
- br label %loop_exit
- loop_exit:
- ret i32 0
- ; CHECK: }
- }
- declare void @incf() noreturn
- declare void @decf() noreturn
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