diff --git a/test/Transforms/LoopStrengthReduce/2008-08-14-ShadowIV.ll b/test/Transforms/LoopStrengthReduce/2008-08-14-ShadowIV.ll index e69de29bb2d..2377589b0eb 100644 --- a/test/Transforms/LoopStrengthReduce/2008-08-14-ShadowIV.ll +++ b/test/Transforms/LoopStrengthReduce/2008-08-14-ShadowIV.ll @@ -0,0 +1,99 @@ +; RUN: llvm-as < %s | opt -loop-reduce | llvm-dis | grep "phi double" | count 1 + +define void @foobar(i32 %n) nounwind { +entry: + icmp eq i32 %n, 0 ; :0 [#uses=2] + br i1 %0, label %return, label %bb.nph + +bb.nph: ; preds = %entry + %umax = select i1 %0, i32 1, i32 %n ; [#uses=1] + br label %bb + +bb: ; preds = %bb, %bb.nph + %i.03 = phi i32 [ 0, %bb.nph ], [ %indvar.next, %bb ] ; [#uses=3] + tail call void @bar( i32 %i.03 ) nounwind + uitofp i32 %i.03 to double ; :1 [#uses=1] + tail call void @foo( double %1 ) nounwind + %indvar.next = add i32 %i.03, 1 ; [#uses=2] + %exitcond = icmp eq i32 %indvar.next, %umax ; [#uses=1] + br i1 %exitcond, label %return, label %bb + +return: ; preds = %bb, %entry + ret void +} + +; Unable to eliminate cast because the mantissa bits for double are not enough +; to hold all of i64 IV bits. +define void @foobar2(i64 %n) nounwind { +entry: + icmp eq i64 %n, 0 ; :0 [#uses=2] + br i1 %0, label %return, label %bb.nph + +bb.nph: ; preds = %entry + %umax = select i1 %0, i64 1, i64 %n ; [#uses=1] + br label %bb + +bb: ; preds = %bb, %bb.nph + %i.03 = phi i64 [ 0, %bb.nph ], [ %indvar.next, %bb ] ; [#uses=3] + trunc i64 %i.03 to i32 ; :1 [#uses=1] + tail call void @bar( i32 %1 ) nounwind + uitofp i64 %i.03 to double ; :2 [#uses=1] + tail call void @foo( double %2 ) nounwind + %indvar.next = add i64 %i.03, 1 ; [#uses=2] + %exitcond = icmp eq i64 %indvar.next, %umax ; [#uses=1] + br i1 %exitcond, label %return, label %bb + +return: ; preds = %bb, %entry + ret void +} + +; Unable to eliminate cast due to potentional overflow. +define void @foobar3() nounwind { +entry: + tail call i32 (...)* @nn( ) nounwind ; :0 [#uses=1] + icmp eq i32 %0, 0 ; :1 [#uses=1] + br i1 %1, label %return, label %bb + +bb: ; preds = %bb, %entry + %i.03 = phi i32 [ 0, %entry ], [ %3, %bb ] ; [#uses=3] + tail call void @bar( i32 %i.03 ) nounwind + uitofp i32 %i.03 to double ; :2 [#uses=1] + tail call void @foo( double %2 ) nounwind + add i32 %i.03, 1 ; :3 [#uses=2] + tail call i32 (...)* @nn( ) nounwind ; :4 [#uses=1] + icmp ugt i32 %4, %3 ; :5 [#uses=1] + br i1 %5, label %bb, label %return + +return: ; preds = %bb, %entry + ret void +} + +; Unable to eliminate cast due to overflow. +define void @foobar4() nounwind { +entry: + br label %bb.nph + +bb.nph: ; preds = %entry + br label %bb + +bb: ; preds = %bb, %bb.nph + %i.03 = phi i8 [ 0, %bb.nph ], [ %indvar.next, %bb ] ; [#uses=3] + %tmp2 = sext i8 %i.03 to i32 ; :0 [#uses=1] + tail call void @bar( i32 %tmp2 ) nounwind + %tmp3 = uitofp i8 %i.03 to double ; :1 [#uses=1] + tail call void @foo( double %tmp3 ) nounwind + %indvar.next = add i8 %i.03, 1 ; [#uses=2] + %tmp = sext i8 %indvar.next to i32 + %exitcond = icmp eq i32 %tmp, 32767 ; [#uses=1] + br i1 %exitcond, label %return, label %bb + +return: ; preds = %bb, %entry + ret void +} + +declare void @bar(i32) + +declare void @foo(double) + +declare i32 @nn(...) +