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[X86] Remove unnecessary isel pattern that is a combination of two other patterns.

The pattern was this

 def : Pat<(i32 (zext (i8 (bitconvert (v8i1 VK8:$src))))),
           (MOVZX32rr8 (EXTRACT_SUBREG (i32 (COPY_TO_REGCLASS VK8:$src, GR32)), sub_8bit))>, Requires<[NoDQI]>;

but if you just let (i32 (zext X)) match byte itself you'll get MOVZX32rr8. And if you let (i8 (bitconvert (v8i1 VK8:$src))) match by itself you'll get (EXTRACT_SUBREG (i32 (COPY_TO_REGCLASS VK8:$src, GR32)), sub_8bit).

So we can just let isel do the two patterns naturally.

llvm-svn: 322049
This commit is contained in:
Craig Topper 2018-01-09 00:50:42 +00:00
parent 3075bb4222
commit c5dbf5a582

View File

@ -2683,8 +2683,6 @@ def : Pat<(i32 (zext (i16 (bitconvert (v16i1 VK16:$src))))),
def : Pat<(i32 (anyext (i16 (bitconvert (v16i1 VK16:$src))))),
(COPY_TO_REGCLASS VK16:$src, GR32)>;
def : Pat<(i32 (zext (i8 (bitconvert (v8i1 VK8:$src))))),
(MOVZX32rr8 (EXTRACT_SUBREG (i32 (COPY_TO_REGCLASS VK8:$src, GR32)), sub_8bit))>, Requires<[NoDQI]>;
def : Pat<(i32 (zext (i8 (bitconvert (v8i1 VK8:$src))))),
(KMOVBrk VK8:$src)>, Requires<[HasDQI]>;
def : Pat<(i32 (anyext (i8 (bitconvert (v8i1 VK8:$src))))),