From 4e49c802899b72f8a86bf80099dc5d7c4a45fc56 Mon Sep 17 00:00:00 2001
From: Evan Cheng <evan.cheng@apple.com>
Date: Sun, 17 Aug 2008 19:25:28 +0000
Subject: Didn't mean to change this.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@54904 91177308-0d34-0410-b5e6-96231b3b80d8
---
 .../LoopStrengthReduce/2008-08-14-ShadowIV.ll      | 99 ++++++++++++++++++++++
 1 file changed, 99 insertions(+)

(limited to 'test/Transforms')

diff --git a/test/Transforms/LoopStrengthReduce/2008-08-14-ShadowIV.ll b/test/Transforms/LoopStrengthReduce/2008-08-14-ShadowIV.ll
index e69de29bb2..2377589b0e 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		; <i1>:0 [#uses=2]
+	br i1 %0, label %return, label %bb.nph
+
+bb.nph:		; preds = %entry
+	%umax = select i1 %0, i32 1, i32 %n		; <i32> [#uses=1]
+	br label %bb
+
+bb:		; preds = %bb, %bb.nph
+	%i.03 = phi i32 [ 0, %bb.nph ], [ %indvar.next, %bb ]		; <i32> [#uses=3]
+	tail call void @bar( i32 %i.03 ) nounwind
+	uitofp i32 %i.03 to double		; <double>:1 [#uses=1]
+	tail call void @foo( double %1 ) nounwind
+	%indvar.next = add i32 %i.03, 1		; <i32> [#uses=2]
+	%exitcond = icmp eq i32 %indvar.next, %umax		; <i1> [#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		; <i1>:0 [#uses=2]
+	br i1 %0, label %return, label %bb.nph
+
+bb.nph:		; preds = %entry
+	%umax = select i1 %0, i64 1, i64 %n		; <i64> [#uses=1]
+	br label %bb
+
+bb:		; preds = %bb, %bb.nph
+	%i.03 = phi i64 [ 0, %bb.nph ], [ %indvar.next, %bb ]		; <i64> [#uses=3]
+	trunc i64 %i.03 to i32		; <i32>:1 [#uses=1]
+	tail call void @bar( i32 %1 ) nounwind
+	uitofp i64 %i.03 to double		; <double>:2 [#uses=1]
+	tail call void @foo( double %2 ) nounwind
+	%indvar.next = add i64 %i.03, 1		; <i64> [#uses=2]
+	%exitcond = icmp eq i64 %indvar.next, %umax		; <i1> [#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		; <i32>:0 [#uses=1]
+	icmp eq i32 %0, 0		; <i1>:1 [#uses=1]
+	br i1 %1, label %return, label %bb
+
+bb:		; preds = %bb, %entry
+	%i.03 = phi i32 [ 0, %entry ], [ %3, %bb ]		; <i32> [#uses=3]
+	tail call void @bar( i32 %i.03 ) nounwind
+	uitofp i32 %i.03 to double		; <double>:2 [#uses=1]
+	tail call void @foo( double %2 ) nounwind
+	add i32 %i.03, 1		; <i32>:3 [#uses=2]
+	tail call i32 (...)* @nn( ) nounwind		; <i32>:4 [#uses=1]
+	icmp ugt i32 %4, %3		; <i1>: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 ]		; <i32> [#uses=3]
+	%tmp2 = sext i8 %i.03 to i32		; <i32>:0 [#uses=1]
+	tail call void @bar( i32 %tmp2 ) nounwind
+	%tmp3 = uitofp i8 %i.03 to double		; <double>:1 [#uses=1]
+	tail call void @foo( double %tmp3 ) nounwind
+	%indvar.next = add i8 %i.03, 1		; <i32> [#uses=2]
+        %tmp = sext i8 %indvar.next to i32
+	%exitcond = icmp eq i32 %tmp, 32767		; <i1> [#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(...)
+
-- 
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