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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@47720 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2008-02-28 17:21:27 +00:00
parent 59c2e868ff
commit e29536ca8d
1 changed files with 19 additions and 0 deletions
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19
lib/Target/README.txt
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@ -631,6 +631,25 @@ implementations of ceil/floor/rint.
//===---------------------------------------------------------------------===//
This GCC bug: http://gcc.gnu.org/bugzilla/show_bug.cgi?id=34043
contains a testcase that compiles down to:
%struct.XMM128 = type { <4 x float> }
..
%src = alloca %struct.XMM128
..
%tmp6263 = bitcast %struct.XMM128* %src to <2 x i64>*
%tmp65 = getelementptr %struct.XMM128* %src, i32 0, i32 0
store <2 x i64> %tmp5899, <2 x i64>* %tmp6263, align 16
%tmp66 = load <4 x float>* %tmp65, align 16
%tmp71 = add <4 x float> %tmp66, %tmp66
If the mid-level optimizer turned the bitcast of pointer + store of tmp5899
into a bitcast of the vector value and a store to the pointer, then the
store->load could be easily removed.
//===---------------------------------------------------------------------===//
Consider:
int test() {