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ARM64 Emitter: Optimize MOVI2R by always starting with a MOVZ, killing the register dependency in the out-of-order engine of the CPU.

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This commit is contained in:
Henrik Rydgard 2015-03-08 11:26:03 +01:00
parent 58b059ca14
commit 80a813bcbd
1 changed files with 5 additions and 5 deletions
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10
Common/Arm64Emitter.cpp
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@ -1787,7 +1787,9 @@ void ARM64XEmitter::MOVI2R(ARM64Reg Rd, u64 imm, bool optimize)
{
unsigned int parts = Is64Bit(Rd) ? 4 : 2;
BitSet32 upload_part(0);
bool need_movz = false;
// Always start with a movz! Kills the dependency on the register.
bool use_movz = true;
if (!imm)
{
@ -1814,8 +1816,6 @@ void ARM64XEmitter::MOVI2R(ARM64Reg Rd, u64 imm, bool optimize)
{
if ((imm >> (i * 16)) & 0xFFFF)
upload_part[i] = 1;
else
need_movz = true;
}
}
@ -1851,10 +1851,10 @@ void ARM64XEmitter::MOVI2R(ARM64Reg Rd, u64 imm, bool optimize)
for (unsigned i = 0; i < parts; ++i)
{
if (need_movz && upload_part[i])
if (use_movz && upload_part[i])
{
MOVZ(Rd, (imm >> (i * 16)) & 0xFFFF, (ShiftAmount)i);
need_movz = false;
use_movz = false;
}
else
{