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| author | Craig Topper <craig.topper@intel.com> | 2019-03-05 18:37:41 +0000 |
|---|---|---|
| committer | Craig Topper <craig.topper@intel.com> | 2019-03-05 18:37:41 +0000 |
| commit | 4a9dd7c39b197fc13eeb1d27ba97ecedc7c6602a (patch) | |
| tree | b581ce972a144ac81cf07c759ac5b3147634b020 /llvm/lib/Target | |
| parent | 216bf7f03bf78742e6160436b2e9bbcacb9c8dfd (diff) | |
| download | bcm5719-llvm-4a9dd7c39b197fc13eeb1d27ba97ecedc7c6602a.tar.gz bcm5719-llvm-4a9dd7c39b197fc13eeb1d27ba97ecedc7c6602a.zip | |
[X86] Enable 8-bit SHL to convert to LEA
Differential Revision: https://reviews.llvm.org/D58870
llvm-svn: 355425
Diffstat (limited to 'llvm/lib/Target')
| -rw-r--r-- | llvm/lib/Target/X86/X86InstrInfo.cpp | 4 | ||||
| -rw-r--r-- | llvm/lib/Target/X86/X86InstrShiftRotate.td | 2 |
2 files changed, 5 insertions, 1 deletions
diff --git a/llvm/lib/Target/X86/X86InstrInfo.cpp b/llvm/lib/Target/X86/X86InstrInfo.cpp index 01b17404d3c..435e4877fc5 100644 --- a/llvm/lib/Target/X86/X86InstrInfo.cpp +++ b/llvm/lib/Target/X86/X86InstrInfo.cpp @@ -755,6 +755,7 @@ MachineInstr *X86InstrInfo::convertToThreeAddressWithLEA( BuildMI(*MFI, MBBI, MI.getDebugLoc(), get(Opcode), OutRegLEA); switch (MIOpc) { default: llvm_unreachable("Unreachable!"); + case X86::SHL8ri: case X86::SHL16ri: { unsigned ShAmt = MI.getOperand(2).getImm(); MIB.addReg(0).addImm(1ULL << ShAmt) @@ -918,6 +919,9 @@ X86InstrInfo::convertToThreeAddress(MachineFunction::iterator &MFI, break; } + case X86::SHL8ri: + Is8BitOp = true; + LLVM_FALLTHROUGH; case X86::SHL16ri: { assert(MI.getNumOperands() >= 3 && "Unknown shift instruction!"); unsigned ShAmt = getTruncatedShiftCount(MI, 2); diff --git a/llvm/lib/Target/X86/X86InstrShiftRotate.td b/llvm/lib/Target/X86/X86InstrShiftRotate.td index 21a20c1c62e..08530562647 100644 --- a/llvm/lib/Target/X86/X86InstrShiftRotate.td +++ b/llvm/lib/Target/X86/X86InstrShiftRotate.td @@ -30,11 +30,11 @@ def SHL64rCL : RI<0xD3, MRM4r, (outs GR64:$dst), (ins GR64:$src1), [(set GR64:$dst, (shl GR64:$src1, CL))]>; } // Uses = [CL], SchedRW +let isConvertibleToThreeAddress = 1 in { // Can transform into LEA. def SHL8ri : Ii8<0xC0, MRM4r, (outs GR8 :$dst), (ins GR8 :$src1, u8imm:$src2), "shl{b}\t{$src2, $dst|$dst, $src2}", [(set GR8:$dst, (shl GR8:$src1, (i8 imm:$src2)))]>; -let isConvertibleToThreeAddress = 1 in { // Can transform into LEA. def SHL16ri : Ii8<0xC1, MRM4r, (outs GR16:$dst), (ins GR16:$src1, u8imm:$src2), "shl{w}\t{$src2, $dst|$dst, $src2}", [(set GR16:$dst, (shl GR16:$src1, (i8 imm:$src2)))]>, |
