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Remove incorrect substitution pattern for UXTB16. It wrongly assumed the input shift was actually a rotate. rdar://8240138

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@109693 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Jim Grosbach 2010-07-28 23:17:45 +00:00
parent f0d7e36691
commit 7946494ceb
1 changed files with 6 additions and 2 deletions
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8
lib/Target/ARM/ARMInstrThumb2.td
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@ -1352,8 +1352,12 @@ defm t2UXTH : T2I_unary_rrot<0b001, "uxth",
defm t2UXTB16 : T2I_unary_rrot_uxtb16<0b011, "uxtb16",
UnOpFrag<(and node:$Src, 0x00FF00FF)>>;
def : T2Pat<(and (shl GPR:$Src, (i32 8)), 0xFF00FF),
(t2UXTB16r_rot GPR:$Src, 24)>, Requires<[HasT2ExtractPack]>;
// FIXME: This pattern incorrectly assumes the shl operator is a rotate.
// The transformation should probably be done as a combiner action
// instead so we can include a check for masking back in the upper
// eight bits of the source into the lower eight bits of the result.
//def : T2Pat<(and (shl GPR:$Src, (i32 8)), 0xFF00FF),
// (t2UXTB16r_rot GPR:$Src, 24)>, Requires<[HasT2ExtractPack]>;
def : T2Pat<(and (srl GPR:$Src, (i32 8)), 0xFF00FF),
(t2UXTB16r_rot GPR:$Src, 8)>, Requires<[HasT2ExtractPack]>;