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- ; RUN: opt < %s -instcombine -S | grep "call.*stackrestore" | count 1
- declare i8* @llvm.stacksave()
- declare void @llvm.stackrestore(i8*)
- ;; Test that llvm.stackrestore is removed when possible.
- define i32* @test1(i32 %P) {
- %tmp = call i8* @llvm.stacksave( )
- call void @llvm.stackrestore( i8* %tmp ) ;; not restoring anything
- %A = alloca i32, i32 %P
- ret i32* %A
- }
- define void @test2(i8* %X) {
- call void @llvm.stackrestore( i8* %X ) ;; no allocas before return.
- ret void
- }
- define void @foo(i32 %size) nounwind {
- entry:
- %tmp118124 = icmp sgt i32 %size, 0 ; <i1> [#uses=1]
- br i1 %tmp118124, label %bb.preheader, label %return
- bb.preheader: ; preds = %entry
- %tmp25 = add i32 %size, -1 ; <i32> [#uses=1]
- %tmp125 = icmp slt i32 %size, 1 ; <i1> [#uses=1]
- %smax = select i1 %tmp125, i32 1, i32 %size ; <i32> [#uses=1]
- br label %bb
- bb: ; preds = %bb, %bb.preheader
- %i.0.reg2mem.0 = phi i32 [ 0, %bb.preheader ], [ %indvar.next, %bb ] ; <i32> [#uses=2]
- %tmp = call i8* @llvm.stacksave( ) ; <i8*> [#uses=1]
- %tmp23 = alloca i8, i32 %size ; <i8*> [#uses=2]
- %tmp27 = getelementptr i8, i8* %tmp23, i32 %tmp25 ; <i8*> [#uses=1]
- store i8 0, i8* %tmp27, align 1
- %tmp28 = call i8* @llvm.stacksave( ) ; <i8*> [#uses=1]
- %tmp52 = alloca i8, i32 %size ; <i8*> [#uses=1]
- %tmp53 = call i8* @llvm.stacksave( ) ; <i8*> [#uses=1]
- %tmp77 = alloca i8, i32 %size ; <i8*> [#uses=1]
- %tmp78 = call i8* @llvm.stacksave( ) ; <i8*> [#uses=1]
- %tmp102 = alloca i8, i32 %size ; <i8*> [#uses=1]
- call void @bar( i32 %i.0.reg2mem.0, i8* %tmp23, i8* %tmp52, i8* %tmp77, i8* %tmp102, i32 %size ) nounwind
- call void @llvm.stackrestore( i8* %tmp78 )
- call void @llvm.stackrestore( i8* %tmp53 )
- call void @llvm.stackrestore( i8* %tmp28 )
- call void @llvm.stackrestore( i8* %tmp )
- %indvar.next = add i32 %i.0.reg2mem.0, 1 ; <i32> [#uses=2]
- %exitcond = icmp eq i32 %indvar.next, %smax ; <i1> [#uses=1]
- br i1 %exitcond, label %return, label %bb
- return: ; preds = %bb, %entry
- ret void
- }
- declare void @bar(i32, i8*, i8*, i8*, i8*, i32)
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