New testcase.

llvm-svn: 31808

test/Regression/Transforms/LoopStrengthReduce/var_stride_used_by_compare.ll

@@ -0,0 +1,48 @@
+; RUN: llvm-as < %s | opt -loop-reduce | llvm-dis &&
+
+; Base should not be i*3, it should be i*2.
+; RUN: llvm-as < %s | opt -loop-reduce | llvm-dis | not grep 'mul.*%i, 3' &&
+
+; Indvar should not start at zero:
+; RUN: llvm-as < %s | opt -loop-reduce | llvm-dis | not grep 'phi uint .* 0'
+
+; mul uint %i, 3
+
+; ModuleID = 't.bc'
+target datalayout = "e-p:32:32"
+target endian = little
+target pointersize = 32
+target triple = "i686-apple-darwin8"
+%flags2 = external global [8193 x sbyte], align 32		; <[8193 x sbyte]*> [#uses=1]
+
+implementation   ; Functions:
+
+void %foo(int %k, int %i) {
+entry:
+	%i = cast int %i to uint		; <uint> [#uses=2]
+	%k_addr.012 = shl int %i, ubyte 1		; <int> [#uses=1]
+	%tmp14 = setgt int %k_addr.012, 8192		; <bool> [#uses=1]
+	br bool %tmp14, label %return, label %bb.preheader
+
+bb.preheader:		; preds = %entry
+	%tmp. = shl uint %i, ubyte 1		; <uint> [#uses=1]
+	br label %bb
+
+bb:		; preds = %bb, %bb.preheader
+	%indvar = phi uint [ %indvar.next, %bb ], [ 0, %bb.preheader ]		; <uint> [#uses=2]
+	%tmp.15 = mul uint %indvar, %i		; <uint> [#uses=1]
+	%tmp.16 = add uint %tmp.15, %tmp.		; <uint> [#uses=2]
+	%k_addr.0.0 = cast uint %tmp.16 to int		; <int> [#uses=1]
+	%tmp = getelementptr [8193 x sbyte]* %flags2, int 0, uint %tmp.16		; <sbyte*> [#uses=1]
+	store sbyte 0, sbyte* %tmp
+	%k_addr.0 = add int %k_addr.0.0, %i		; <int> [#uses=1]
+	%tmp = setgt int %k_addr.0, 8192		; <bool> [#uses=1]
+	%indvar.next = add uint %indvar, 1		; <uint> [#uses=1]
+	br bool %tmp, label %return.loopexit, label %bb
+
+return.loopexit:		; preds = %bb
+	br label %return
+
+return:		; preds = %return.loopexit, %entry
+	ret void
+}