108 lines
2.7 KiB
LLVM
108 lines
2.7 KiB
LLVM
; RUN: opt < %s -loop-unswitch -verify-loop-info -S < %s 2>&1 | FileCheck %s
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define i32 @test(i32* %A, i1 %C) {
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entry:
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br label %no_exit
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no_exit: ; preds = %no_exit.backedge, %entry
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%i.0.0 = phi i32 [ 0, %entry ], [ %i.0.0.be, %no_exit.backedge ] ; <i32> [#uses=3]
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%gep.upgrd.1 = zext i32 %i.0.0 to i64 ; <i64> [#uses=1]
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%tmp.7 = getelementptr i32, i32* %A, i64 %gep.upgrd.1 ; <i32*> [#uses=4]
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%tmp.13 = load i32, i32* %tmp.7 ; <i32> [#uses=2]
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%tmp.14 = add i32 %tmp.13, 1 ; <i32> [#uses=1]
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store i32 %tmp.14, i32* %tmp.7
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br i1 %C, label %then, label %endif
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then: ; preds = %no_exit
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%tmp.29 = load i32, i32* %tmp.7 ; <i32> [#uses=1]
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%tmp.30 = add i32 %tmp.29, 2 ; <i32> [#uses=1]
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store i32 %tmp.30, i32* %tmp.7
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%inc9 = add i32 %i.0.0, 1 ; <i32> [#uses=2]
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%tmp.112 = icmp ult i32 %inc9, 100000 ; <i1> [#uses=1]
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br i1 %tmp.112, label %no_exit.backedge, label %return
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no_exit.backedge: ; preds = %endif, %then
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%i.0.0.be = phi i32 [ %inc9, %then ], [ %inc, %endif ] ; <i32> [#uses=1]
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br label %no_exit
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endif: ; preds = %no_exit
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%inc = add i32 %i.0.0, 1 ; <i32> [#uses=2]
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%tmp.1 = icmp ult i32 %inc, 100000 ; <i1> [#uses=1]
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br i1 %tmp.1, label %no_exit.backedge, label %return
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return: ; preds = %endif, %then
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ret i32 %tmp.13
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}
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; This simple test would normally unswitch, but should be inhibited by the presence of
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; the noduplicate call.
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; CHECK-LABEL: @test2(
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define i32 @test2(i32* %var) {
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%mem = alloca i32
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store i32 2, i32* %mem
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%c = load i32, i32* %mem
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br label %loop_begin
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loop_begin:
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%var_val = load i32, i32* %var
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switch i32 %c, label %default [
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i32 1, label %inc
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i32 2, label %dec
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]
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inc:
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call void @incf() noreturn nounwind
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br label %loop_begin
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dec:
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; CHECK: call void @decf()
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; CHECK-NOT: call void @decf()
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call void @decf() noreturn nounwind noduplicate
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br label %loop_begin
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default:
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br label %loop_exit
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loop_exit:
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ret i32 0
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; CHECK: }
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}
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; This simple test would normally unswitch, but should be inhibited by the presence of
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; the convergent call that is not control-dependent on the unswitch condition.
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; CHECK-LABEL: @test3(
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define i32 @test3(i32* %var) {
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%mem = alloca i32
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store i32 2, i32* %mem
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%c = load i32, i32* %mem
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br label %loop_begin
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loop_begin:
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%var_val = load i32, i32* %var
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; CHECK: call void @conv()
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; CHECK-NOT: call void @conv()
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call void @conv() convergent
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switch i32 %c, label %default [
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i32 1, label %inc
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i32 2, label %dec
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]
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inc:
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call void @incf() noreturn nounwind
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br label %loop_begin
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dec:
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call void @decf() noreturn nounwind
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br label %loop_begin
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default:
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br label %loop_exit
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loop_exit:
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ret i32 0
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; CHECK: }
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}
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declare void @incf() noreturn
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declare void @decf() noreturn
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declare void @conv() convergent
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