diff options
| author | Dan Gohman <gohman@apple.com> | 2007-10-09 15:42:21 +0000 |
|---|---|---|
| committer | Dan Gohman <gohman@apple.com> | 2007-10-09 15:42:21 +0000 |
| commit | 5bf88ebab96516de20ec6abfad46a8ef7e6d0d76 (patch) | |
| tree | 4ca5f2984101397eba92db89559f0267a8c3fb3b | |
| parent | dde01ec40987ff3f187f0cff43cbbe52ea06615e (diff) | |
This is done.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@42785 91177308-0d34-0410-b5e6-96231b3b80d8
| -rw-r--r-- | lib/Target/X86/README.txt | 30 |
1 files changed, 0 insertions, 30 deletions
diff --git a/lib/Target/X86/README.txt b/lib/Target/X86/README.txt index 807a921ac7..9bafff73d5 100644 --- a/lib/Target/X86/README.txt +++ b/lib/Target/X86/README.txt @@ -10,36 +10,6 @@ http://softwarecommunity.intel.com/isn/Downloads/Intel%20SSE4%20Programming%20Re //===---------------------------------------------------------------------===// -Add a MUL2U and MUL2S nodes to represent a multiply that returns both the -Hi and Lo parts (combination of MUL and MULH[SU] into one node). Add this to -X86, & make the dag combiner produce it when needed. This will eliminate one -imul from the code generated for: - -long long test(long long X, long long Y) { return X*Y; } - -by using the EAX result from the mul. We should add a similar node for -DIVREM. - -another case is: - -long long test(int X, int Y) { return (long long)X*Y; } - -... which should only be one imul instruction. - -or: - -unsigned long long int t2(unsigned int a, unsigned int b) { - return (unsigned long long)a * b; -} - -... which should be one mul instruction. - - -This can be done with a custom expander, but it would be nice to move this to -generic code. - -//===---------------------------------------------------------------------===// - CodeGen/X86/lea-3.ll:test3 should be a single LEA, not a shift/move. The X86 backend knows how to three-addressify this shift, but it appears the register allocator isn't even asking it to do so in this case. We should investigate |