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new testcase for serious code pessimization

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llvm-svn: 33770
This commit is contained in:
Chris Lattner 2007-02-01 22:29:26 +00:00
parent 1f769ed900
commit 49d3308f43
1 changed files with 43 additions and 0 deletions
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test/Transforms/InstCombine/2007-02-01-LoadSinkAlloca.ll Normal file
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; RUN: llvm-as < %s | opt -instcombine -mem2reg | llvm-dis | grep '%A = alloca' &&
; RUN: llvm-as < %s | opt -instcombine -mem2reg | llvm-dis | not grep '%B = alloca'
; Ensure that instcombine doesn't sink the loads in entry/cond_true into
; cond_next. Doing so prevents mem2reg from promoting the B alloca.
define i32 @test2(i32 %C) {
entry:
%A = alloca i32
%B = alloca i32
%tmp = call i32 (...)* @bar( i32* %A ) ; <i32> [#uses=0]
%T = load i32* %A ; <i32> [#uses=1]
%tmp = icmp eq i32 %C, 0 ; <i1> [#uses=1]
br i1 %tmp, label %cond_next, label %cond_true
cond_true: ; preds = %entry
store i32 123, i32* %B
call i32 @test2( i32 123 ) ; <i32>:0 [#uses=0]
%T1 = load i32* %B ; <i32> [#uses=1]
br label %cond_next
cond_next: ; preds = %cond_true, %entry
%tmp1.0 = phi i32 [ %T1, %cond_true ], [ %T, %entry ] ; <i32> [#uses=1]
%tmp7 = call i32 (...)* @baq( ) ; <i32> [#uses=0]
%tmp8 = call i32 (...)* @baq( ) ; <i32> [#uses=0]
%tmp9 = call i32 (...)* @baq( ) ; <i32> [#uses=0]
%tmp10 = call i32 (...)* @baq( ) ; <i32> [#uses=0]
%tmp11 = call i32 (...)* @baq( ) ; <i32> [#uses=0]
%tmp12 = call i32 (...)* @baq( ) ; <i32> [#uses=0]
%tmp13 = call i32 (...)* @baq( ) ; <i32> [#uses=0]
%tmp14 = call i32 (...)* @baq( ) ; <i32> [#uses=0]
%tmp15 = call i32 (...)* @baq( ) ; <i32> [#uses=0]
%tmp16 = call i32 (...)* @baq( ) ; <i32> [#uses=0]
%tmp17 = call i32 (...)* @baq( ) ; <i32> [#uses=0]
%tmp18 = call i32 (...)* @baq( ) ; <i32> [#uses=0]
%tmp19 = call i32 (...)* @baq( ) ; <i32> [#uses=0]
%tmp20 = call i32 (...)* @baq( ) ; <i32> [#uses=0]
ret i32 %tmp1.0
}
declare i32 @bar(...)
declare i32 @baq(...)