From c7749b747e634f310b7f0e075f7329dcb88f58cc Mon Sep 17 00:00:00 2001
From: Dan Gohman <gohman@apple.com>
Date: Mon, 27 Apr 2009 20:35:32 +0000
Subject: Permit ChangeCompareStride to rewrite a comparison when the factor
 between the comparison's iv stride and the candidate stride is exactly -1.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@70244 91177308-0d34-0410-b5e6-96231b3b80d8
---
 test/CodeGen/X86/change-compare-stride-0.ll | 77 +++++++++++++++++++++++++++++
 1 file changed, 77 insertions(+)
 create mode 100644 test/CodeGen/X86/change-compare-stride-0.ll

(limited to 'test/CodeGen/X86/change-compare-stride-0.ll')

diff --git a/test/CodeGen/X86/change-compare-stride-0.ll b/test/CodeGen/X86/change-compare-stride-0.ll
new file mode 100644
index 0000000..87194d6
--- /dev/null
+++ b/test/CodeGen/X86/change-compare-stride-0.ll
@@ -0,0 +1,77 @@
+; RUN: llvm-as < %s | llc -march=x86 > %t
+; RUN: grep {cmpl	\$4294966818,} %t
+; RUN: not grep inc %t
+; RUN: not grep {leal	1(} %t
+; RUN: not grep {leal	-1(} %t
+; RUN: grep dec %t | count 1
+
+define void @borf(i8* nocapture %in, i8* nocapture %out) nounwind {
+bb4.thread:
+	br label %bb2.outer
+
+bb2.outer:		; preds = %bb4, %bb4.thread
+	%indvar18 = phi i32 [ 0, %bb4.thread ], [ %indvar.next28, %bb4 ]		; <i32> [#uses=3]
+	%tmp34 = mul i32 %indvar18, 65535		; <i32> [#uses=1]
+	%i.0.reg2mem.0.ph = add i32 %tmp34, 639		; <i32> [#uses=1]
+	%0 = and i32 %i.0.reg2mem.0.ph, 65535		; <i32> [#uses=1]
+	%1 = mul i32 %0, 480		; <i32> [#uses=1]
+	%tmp20 = mul i32 %indvar18, -478		; <i32> [#uses=1]
+	br label %bb2
+
+bb2:		; preds = %bb2, %bb2.outer
+	%indvar = phi i32 [ 0, %bb2.outer ], [ %indvar.next, %bb2 ]		; <i32> [#uses=3]
+	%ctg2 = getelementptr i8* %out, i32 %tmp20		; <i8*> [#uses=1]
+	%tmp21 = ptrtoint i8* %ctg2 to i32		; <i32> [#uses=1]
+	%tmp23 = sub i32 %tmp21, %indvar		; <i32> [#uses=1]
+	%out_addr.0.reg2mem.0 = inttoptr i32 %tmp23 to i8*		; <i8*> [#uses=1]
+	%tmp25 = mul i32 %indvar, 65535		; <i32> [#uses=1]
+	%j.0.reg2mem.0 = add i32 %tmp25, 479		; <i32> [#uses=1]
+	%2 = and i32 %j.0.reg2mem.0, 65535		; <i32> [#uses=1]
+	%3 = add i32 %1, %2		; <i32> [#uses=9]
+	%4 = add i32 %3, -481		; <i32> [#uses=1]
+	%5 = getelementptr i8* %in, i32 %4		; <i8*> [#uses=1]
+	%6 = load i8* %5, align 1		; <i8> [#uses=1]
+	%7 = add i32 %3, -480		; <i32> [#uses=1]
+	%8 = getelementptr i8* %in, i32 %7		; <i8*> [#uses=1]
+	%9 = load i8* %8, align 1		; <i8> [#uses=1]
+	%10 = add i32 %3, -479		; <i32> [#uses=1]
+	%11 = getelementptr i8* %in, i32 %10		; <i8*> [#uses=1]
+	%12 = load i8* %11, align 1		; <i8> [#uses=1]
+	%13 = add i32 %3, -1		; <i32> [#uses=1]
+	%14 = getelementptr i8* %in, i32 %13		; <i8*> [#uses=1]
+	%15 = load i8* %14, align 1		; <i8> [#uses=1]
+	%16 = getelementptr i8* %in, i32 %3		; <i8*> [#uses=1]
+	%17 = load i8* %16, align 1		; <i8> [#uses=1]
+	%18 = add i32 %3, 1		; <i32> [#uses=1]
+	%19 = getelementptr i8* %in, i32 %18		; <i8*> [#uses=1]
+	%20 = load i8* %19, align 1		; <i8> [#uses=1]
+	%21 = add i32 %3, 481		; <i32> [#uses=1]
+	%22 = getelementptr i8* %in, i32 %21		; <i8*> [#uses=1]
+	%23 = load i8* %22, align 1		; <i8> [#uses=1]
+	%24 = add i32 %3, 480		; <i32> [#uses=1]
+	%25 = getelementptr i8* %in, i32 %24		; <i8*> [#uses=1]
+	%26 = load i8* %25, align 1		; <i8> [#uses=1]
+	%27 = add i32 %3, 479		; <i32> [#uses=1]
+	%28 = getelementptr i8* %in, i32 %27		; <i8*> [#uses=1]
+	%29 = load i8* %28, align 1		; <i8> [#uses=1]
+	%30 = add i8 %9, %6		; <i8> [#uses=1]
+	%31 = add i8 %30, %12		; <i8> [#uses=1]
+	%32 = add i8 %31, %15		; <i8> [#uses=1]
+	%33 = add i8 %32, %17		; <i8> [#uses=1]
+	%34 = add i8 %33, %20		; <i8> [#uses=1]
+	%35 = add i8 %34, %23		; <i8> [#uses=1]
+	%36 = add i8 %35, %26		; <i8> [#uses=1]
+	%37 = add i8 %36, %29		; <i8> [#uses=1]
+	store i8 %37, i8* %out_addr.0.reg2mem.0, align 1
+	%indvar.next = add i32 %indvar, 1		; <i32> [#uses=2]
+	%exitcond = icmp eq i32 %indvar.next, 478		; <i1> [#uses=1]
+	br i1 %exitcond, label %bb4, label %bb2
+
+bb4:		; preds = %bb2
+	%indvar.next28 = add i32 %indvar18, 1		; <i32> [#uses=2]
+	%exitcond29 = icmp eq i32 %indvar.next28, 638		; <i1> [#uses=1]
+	br i1 %exitcond29, label %return, label %bb2.outer
+
+return:		; preds = %bb4
+	ret void
+}
-- 
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