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| author | Craig Topper <craig.topper@gmail.com> | 2015-04-04 02:31:43 +0000 |
|---|---|---|
| committer | Craig Topper <craig.topper@gmail.com> | 2015-04-04 02:31:43 +0000 |
| commit | 3d44178733c451f12075b6527580db10ce11c50d (patch) | |
| tree | 6f9195c6d43b0da337bb9ee7d9cb63ed0679223e /llvm/lib | |
| parent | d9bbc4d2eef5a31788e2212af10ff7b4ebdd9618 (diff) | |
| download | bcm5719-llvm-3d44178733c451f12075b6527580db10ce11c50d.tar.gz bcm5719-llvm-3d44178733c451f12075b6527580db10ce11c50d.zip | |
[X86] Add a comment about the change in r234075.
llvm-svn: 234079
Diffstat (limited to 'llvm/lib')
| -rw-r--r-- | llvm/lib/Target/X86/X86InstrCompiler.td | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/llvm/lib/Target/X86/X86InstrCompiler.td b/llvm/lib/Target/X86/X86InstrCompiler.td index e7de24bca41..227f69a9d84 100644 --- a/llvm/lib/Target/X86/X86InstrCompiler.td +++ b/llvm/lib/Target/X86/X86InstrCompiler.td @@ -1232,6 +1232,8 @@ def : Pat<(store (add (loadi64 addr:$dst), 0x00000000800000000), addr:$dst), // with implicit zero-extension instead of a 64-bit and if the immediate has at // least 32 bits of leading zeros. If in addition the last 32 bits can be // represented with a sign extension of a 8 bit constant, use that. +// This can also reduce instruction size by eliminating the need for the REX +// prefix. let AddedComplexity = 1 in // Give priority over i64immSExt8. def : Pat<(and GR64:$src, i64immZExt32SExt8:$imm), |
