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this (and probably several others) are now done.

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llvm-svn: 89982
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Chris Lattner 2009-11-27 00:35:04 +00:00
parent 02ffb0a608
commit 225a88f4ab
1 changed files with 0 additions and 33 deletions
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lib/Target/README.txt
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@ -1196,39 +1196,6 @@ bb3: ; preds = %bb1, %bb2, %bb
GCC PR33344 is a similar case.
//===---------------------------------------------------------------------===//
[PHI TRANSLATE INDEXED GEPs] PR5313
Load redundancy elimination for simple loop. This loop:
void append_text(const char* text,unsigned char * const io) {
while(*text)
*io=*text++;
}
Compiles to have a fully redundant load in the loop (%2):
define void @append_text(i8* nocapture %text, i8* nocapture %io) nounwind {
entry:
%0 = load i8* %text, align 1 ; <i8> [#uses=1]
%1 = icmp eq i8 %0, 0 ; <i1> [#uses=1]
br i1 %1, label %return, label %bb
bb: ; preds = %bb, %entry
%indvar = phi i32 [ 0, %entry ], [ %tmp, %bb ] ; <i32> [#uses=2]
%text_addr.04 = getelementptr i8* %text, i32 %indvar ; <i8*> [#uses=1]
%2 = load i8* %text_addr.04, align 1 ; <i8> [#uses=1]
store i8 %2, i8* %io, align 1
%tmp = add i32 %indvar, 1 ; <i32> [#uses=2]
%scevgep = getelementptr i8* %text, i32 %tmp ; <i8*> [#uses=1]
%3 = load i8* %scevgep, align 1 ; <i8> [#uses=1]
%4 = icmp eq i8 %3, 0 ; <i1> [#uses=1]
br i1 %4, label %return, label %bb
return: ; preds = %bb, %entry
ret void
}
//===---------------------------------------------------------------------===//