1 ; RUN: opt < %s -instcombine -S | grep "call.*llvm.stackrestore" 2 ; PR2488 3 target datalayout = "e-p:32:32:32-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:32:64-f32:32:32-f64:32:64-v64:64:64-v128:128:128-a0:0:64-f80:32:32" 4 target triple = "i386-pc-linux-gnu" 5 @p = weak global i8* null ; <i8**> [#uses=2] 6 7 define i32 @main() nounwind { 8 entry: 9 %tmp248 = call i8* @llvm.stacksave( ) ; <i8*> [#uses=1] 10 %tmp2752 = alloca i32 ; <i32*> [#uses=2] 11 %tmpcast53 = bitcast i32* %tmp2752 to i8* ; <i8*> [#uses=1] 12 store i32 2, i32* %tmp2752, align 4 13 store volatile i8* %tmpcast53, i8** @p, align 4 14 br label %bb44 15 16 bb: ; preds = %bb44 17 ret i32 0 18 19 bb44: ; preds = %bb44, %entry 20 %indvar = phi i32 [ 0, %entry ], [ %tmp3857, %bb44 ] ; <i32> [#uses=1] 21 %tmp249 = phi i8* [ %tmp248, %entry ], [ %tmp2, %bb44 ] ; <i8*> [#uses=1] 22 %tmp3857 = add i32 %indvar, 1 ; <i32> [#uses=3] 23 call void @llvm.stackrestore( i8* %tmp249 ) 24 %tmp2 = call i8* @llvm.stacksave( ) ; <i8*> [#uses=1] 25 %tmp4 = srem i32 %tmp3857, 1000 ; <i32> [#uses=2] 26 %tmp5 = add i32 %tmp4, 1 ; <i32> [#uses=1] 27 %tmp27 = alloca i32, i32 %tmp5 ; <i32*> [#uses=3] 28 %tmpcast = bitcast i32* %tmp27 to i8* ; <i8*> [#uses=1] 29 store i32 1, i32* %tmp27, align 4 30 %tmp34 = getelementptr i32, i32* %tmp27, i32 %tmp4 ; <i32*> [#uses=1] 31 store i32 2, i32* %tmp34, align 4 32 store volatile i8* %tmpcast, i8** @p, align 4 33 %exitcond = icmp eq i32 %tmp3857, 999999 ; <i1> [#uses=1] 34 br i1 %exitcond, label %bb, label %bb44 35 } 36 37 declare i8* @llvm.stacksave() nounwind 38 39 declare void @llvm.stackrestore(i8*) nounwind 40
