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| author | Nate Begeman <natebegeman@mac.com> | 2004-10-07 22:26:12 +0000 |
|---|---|---|
| committer | Nate Begeman <natebegeman@mac.com> | 2004-10-07 22:26:12 +0000 |
| commit | cb90de37a720b0b00d6303b49b8df6d5ac5f34f9 (patch) | |
| tree | c79217f3b3bbd097f64987255a7747a9e168ba43 | |
| parent | 5a181c848bc9994265ef27d3f9fc50144968f61b (diff) | |
| download | external_llvm-cb90de37a720b0b00d6303b49b8df6d5ac5f34f9.zip external_llvm-cb90de37a720b0b00d6303b49b8df6d5ac5f34f9.tar.gz external_llvm-cb90de37a720b0b00d6303b49b8df6d5ac5f34f9.tar.bz2 | |
Add ori reg, reg, 0 as a move instruction. This can be generated from
loading a 32bit constant into a register whose low halfword is all zeroes.
We now omit the ori after the lis for the following C code:
int bar(int y) { return y * 0x00F0000; }
_bar:
.LBB_bar_0: ; entry
; IMPLICIT_DEF
lis r2, 15
mullw r3, r3, r2
blr
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@16825 91177308-0d34-0410-b5e6-96231b3b80d8
| -rw-r--r-- | lib/Target/PowerPC/PPCInstrInfo.cpp | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/lib/Target/PowerPC/PPCInstrInfo.cpp b/lib/Target/PowerPC/PPCInstrInfo.cpp index ceb4d50..ec25239 100644 --- a/lib/Target/PowerPC/PPCInstrInfo.cpp +++ b/lib/Target/PowerPC/PPCInstrInfo.cpp @@ -46,6 +46,17 @@ bool PPC32InstrInfo::isMoveInstr(const MachineInstr& MI, destReg = MI.getOperand(0).getReg(); return true; } + } else if (oc == PPC::ORI) { // ori r1, r2, 0 + assert(MI.getNumOperands() == 3 && + MI.getOperand(0).isRegister() && + MI.getOperand(1).isRegister() && + MI.getOperand(2).isImmediate() && + "invalid PPC ORI instruction!"); + if (MI.getOperand(2).getImmedValue()==0) { + sourceReg = MI.getOperand(1).getReg(); + destReg = MI.getOperand(0).getReg(); + return true; + } } else if (oc == PPC::FMR) { // fmr r1, r2 assert(MI.getNumOperands() == 2 && MI.getOperand(0).isRegister() && |