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Added i16 SH{L|R}D patterns. 

llvm-svn: 25468
This commit is contained in:
Evan Cheng 2006-01-19 23:26:24 +00:00
parent 93bde9cbf7
commit 8591b9f254
2 changed files with 13 additions and 3 deletions
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14
llvm/lib/Target/X86/X86InstrInfo.td
View File

@ -3068,12 +3068,22 @@ def : Pat<(shl R8 :$src1, (i8 1)), (ADD8rr R8 :$src1, R8 :$src1)>;
def : Pat<(shl R16:$src1, (i8 1)), (ADD16rr R16:$src1, R16:$src1)>;
def : Pat<(shl R32:$src1, (i8 1)), (ADD32rr R32:$src1, R32:$src1)>;
// (or (x >> c) | (y << (32 - c))) ==> (shrd x, y, c)
// (or (x >> c) | (y << (32 - c))) ==> (shrd32 x, y, c)
def : Pat<(or (srl R32:$src1, CL:$amt),
(shl R32:$src2, (sub 32, CL:$amt))),
(SHRD32rrCL R32:$src1, R32:$src2)>;
// (or (x << c) | (y >> (32 - c))) ==> (shld x, y, c)
// (or (x << c) | (y >> (32 - c))) ==> (shld32 x, y, c)
def : Pat<(or (shl R32:$src1, CL:$amt),
(srl R32:$src2, (sub 32, CL:$amt))),
(SHLD32rrCL R32:$src1, R32:$src2)>;
// (or (x >> c) | (y << (16 - c))) ==> (shrd16 x, y, c)
def : Pat<(or (srl R16:$src1, CL:$amt),
(shl R16:$src2, (sub 16, CL:$amt))),
(SHRD16rrCL R16:$src1, R16:$src2)>;
// (or (x << c) | (y >> (16 - c))) ==> (shld16 x, y, c)
def : Pat<(or (shl R16:$src1, CL:$amt),
(srl R16:$src2, (sub 16, CL:$amt))),
(SHLD16rrCL R16:$src1, R16:$src2)>;

2
llvm/lib/Target/X86/X86TargetMachine.cpp
View File

@ -48,7 +48,7 @@ namespace {
cl::opt<bool, true> EnableX86DAGDAG("enable-x86-dag-isel", cl::Hidden,
cl::desc("Enable DAG-to-DAG isel for X86"),
cl::location(X86DAGIsel),
cl::init(false));
cl::init(true));
// FIXME: This should eventually be handled with target triples and
// subtarget support!