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new testcase for PR590

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llvm-svn: 22317
This commit is contained in:
Chris Lattner 2005-06-30 07:28:54 +00:00
parent 31e3028bac
commit b4c2302706
1 changed files with 51 additions and 0 deletions
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51
test/Regression/Transforms/Mem2Reg/2005-06-30-ReadBeforeWrite.ll Normal file
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; RUN: llvm-as < %s | opt -mem2reg -instcombine | llvm-dis | grep store
; PR590
void %zero(sbyte* %p, int %n) {
entry:
%p_addr = alloca sbyte* ; <sbyte**> [#uses=2]
%n_addr = alloca int ; <int*> [#uses=2]
%i = alloca int ; <int*> [#uses=6]
%out = alloca int ; <int*> [#uses=2]
%undef = alloca int ; <int*> [#uses=2]
store sbyte* %p, sbyte** %p_addr
store int %n, int* %n_addr
store int 0, int* %i
br label %loopentry
loopentry: ; preds = %endif, %entry
%tmp.0 = load int* %n_addr ; <int> [#uses=1]
%tmp.1 = add int %tmp.0, 1 ; <int> [#uses=1]
%tmp.2 = load int* %i ; <int> [#uses=1]
%tmp.3 = setgt int %tmp.1, %tmp.2 ; <bool> [#uses=2]
%tmp.4 = cast bool %tmp.3 to int ; <int> [#uses=0]
br bool %tmp.3, label %no_exit, label %return
no_exit: ; preds = %loopentry
%tmp.5 = load int* %undef ; <int> [#uses=1]
store int %tmp.5, int* %out
store int 0, int* %undef
%tmp.6 = load int* %i ; <int> [#uses=1]
%tmp.7 = setgt int %tmp.6, 0 ; <bool> [#uses=2]
%tmp.8 = cast bool %tmp.7 to int ; <int> [#uses=0]
br bool %tmp.7, label %then, label %endif
then: ; preds = %no_exit
%tmp.9 = load sbyte** %p_addr ; <sbyte*> [#uses=1]
%tmp.10 = load int* %i ; <int> [#uses=1]
%tmp.11 = sub int %tmp.10, 1 ; <int> [#uses=1]
%tmp.12 = getelementptr sbyte* %tmp.9, int %tmp.11 ; <sbyte*> [#uses=1]
%tmp.13 = load int* %out ; <int> [#uses=1]
%tmp.14 = cast int %tmp.13 to sbyte ; <sbyte> [#uses=1]
store sbyte %tmp.14, sbyte* %tmp.12
br label %endif
endif: ; preds = %then, %no_exit
%tmp.15 = load int* %i ; <int> [#uses=1]
%inc = add int %tmp.15, 1 ; <int> [#uses=1]
store int %inc, int* %i
br label %loopentry
return: ; preds = %loopentry
ret void
}