llvm/test/Transforms/InstCombine/2008-05-08-StrLenSink.ll
Chris Lattner 2539e33893 More than just loads can read from memory: readonly calls like strlen
also need to be checked for memory modifying instructions before we
can sink them.  THis fixes the second half of PR2297.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@50860 91177308-0d34-0410-b5e6-96231b3b80d8
2008-05-08 17:37:37 +00:00

29 lines
1020 B
LLVM

; RUN: llvm-as < %s | opt -instcombine | llvm-dis | %prcontext strlen 1 | not grep ret
; PR2297
target datalayout = "e-p:32:32:32-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:32:64-f32:32:32-f64:32:64-v64:64:64-v128:128:128-a0:0:64-f80:128:128"
target triple = "i386-apple-darwin8"
define i32 @a() nounwind {
entry:
%"alloca point" = bitcast i32 0 to i32 ; <i32> [#uses=0]
%tmp1 = call i8* @malloc( i32 10 ) nounwind ; <i8*> [#uses=5]
%tmp3 = getelementptr i8* %tmp1, i32 1 ; <i8*> [#uses=1]
store i8 0, i8* %tmp3, align 1
%tmp5 = getelementptr i8* %tmp1, i32 0 ; <i8*> [#uses=1]
store i8 1, i8* %tmp5, align 1
%tmp7 = call i32 @strlen( i8* %tmp1 ) nounwind readonly ; <i32> [#uses=1]
%tmp9 = getelementptr i8* %tmp1, i32 0 ; <i8*> [#uses=1]
store i8 0, i8* %tmp9, align 1
%tmp11 = call i32 (...)* @b( i8* %tmp1 ) nounwind ; <i32> [#uses=0]
br label %return
return: ; preds = %entry
ret i32 %tmp7
}
declare i8* @malloc(i32) nounwind
declare i32 @strlen(i8*) nounwind readonly
declare i32 @b(...)