llvm/test/Transforms/InstCombine/2008-06-13-ReadOnlyCallStore.ll

; RUN: opt < %s -instcombine -S | grep {store i8} | count 2

define i32 @a(i8* %s) nounwind  {
entry:
	store i8 0, i8* %s, align 1 ; This store cannot be eliminated!
	%tmp3 = call i32 @strlen( i8* %s ) nounwind readonly
	%tmp5 = icmp ne i32 %tmp3, 0
	br i1 %tmp5, label %bb, label %bb8

bb:		; preds = %entry
	store i8 0, i8* %s, align 1
	br label %bb8

bb8:
	ret i32 %tmp3
}

declare i32 @strlen(i8*) nounwind readonly
Change tests from "opt %s" to "opt < %s" so that opt doesn't see the input filename so that opt doesn't print the input filename in the output so that grep lines in the tests don't unintentionally match strings in the input filename. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@81537 91177308-0d34-0410-b5e6-96231b3b80d8 2009-09-11 18:01:28 +00:00			`; RUN: opt < %s -instcombine -S \| grep {store i8} \| count 2`
Don't skip over instructions other than loads that might read memory when trying to sink stores. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52259 91177308-0d34-0410-b5e6-96231b3b80d8 2008-06-13 22:02:12 +00:00
			`define i32 @a(i8* %s) nounwind {`
			`entry:`
			`store i8 0, i8* %s, align 1 ; This store cannot be eliminated!`
			`%tmp3 = call i32 @strlen( i8* %s ) nounwind readonly`
			`%tmp5 = icmp ne i32 %tmp3, 0`
			`br i1 %tmp5, label %bb, label %bb8`

			`bb: ; preds = %entry`
			`store i8 0, i8* %s, align 1`
			`br label %bb8`

			`bb8:`
			`ret i32 %tmp3`
			`}`

			`declare i32 @strlen(i8*) nounwind readonly`