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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@123141 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2011-01-09 23:42:22 +00:00
parent b79cb79a46
commit 7cc4e304a6
1 changed files with 2 additions and 22 deletions
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24
lib/Target/README.txt
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@ -2109,33 +2109,13 @@ aggressively as malloc though.
//===---------------------------------------------------------------------===//
clang -03 currently compiles this code
clang -03 doesn't optimize this:
void f1(int* begin, int* end) {
std::fill(begin, end, 0);
}
into
define void @_Z2f1PiS_(i32* %begin, i32* %end) nounwind {
entry:
%cmp7.i.i = icmp eq i32* %begin, %end
br i1 %cmp7.i.i, label %_ZSt4fillIPiiEvT_S1_RKT0_.exit, label %for.body.i.i
for.body.i.i: ; preds = %entry, %for.body.i.i
%indvar.i.i = phi i64 [ %tmp, %for.body.i.i ], [ 0, %entry ]
%tmp = add i64 %indvar.i.i, 1
%ptrincdec.i.i = getelementptr i32* %begin, i64 %tmp
%__first.addr.08.i.i = getelementptr i32* %begin, i64 %indvar.i.i
store i32 0, i32* %__first.addr.08.i.i, align 4, !tbaa !0
%cmp.i.i = icmp eq i32* %ptrincdec.i.i, %end
br i1 %cmp.i.i, label %_ZSt4fillIPiiEvT_S1_RKT0_.exit, label %for.body.i.i
_ZSt4fillIPiiEvT_S1_RKT0_.exit: ; preds = %for.body.i.i, %entry
ret void
}
It should compile it to a memset.
int a memset. This is PR8942.
//===---------------------------------------------------------------------===//