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Significantly faster byte swapping on xmm read/write.

This commit is contained in:
Ben Vanik 2013-10-04 22:29:19 -07:00
parent d3bf7813ea
commit e8429b75e0
1 changed files with 7 additions and 17 deletions
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24
src/xenia/cpu/x64/x64_emitter.cc
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@ -1869,6 +1869,7 @@ GpVar X64Emitter::ReadMemory(
return value;
}
static __m128i __xmm_byte_swap = _mm_set_epi8( 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15);
XmmVar X64Emitter::ReadMemoryXmm(
uint32_t cia, GpVar& addr, uint32_t alignment) {
X86Compiler& c = compiler_;
@ -1892,15 +1893,9 @@ XmmVar X64Emitter::ReadMemoryXmm(
c.movaps(value, xmmword_ptr(real_address));
// Byte swap.
// http://www.asmcommunity.net/forums/topic/?id=29743
XmmVar temp(c.newXmmVar());
c.pshufd(value, value, imm(0x1B)); // 00011011b
c.pshuflw(value, value, imm(0xB1)); // 10110001b
c.pshufhw(value, value, imm(0xB1)); // 10110001b
c.movdqa(temp, value);
c.psrlw(temp, imm(8));
c.psllw(value, imm(8));
c.por(value, temp);
GpVar byte_swap_addr(c.newGpVar());
c.mov(byte_swap_addr, imm((sysint_t)&__xmm_byte_swap));
c.pshufb(value, xmmword_ptr(byte_swap_addr));
return value;
}
@ -1971,14 +1966,9 @@ void X64Emitter::WriteMemoryXmm(
// Byte swap.
// TODO(benvanik): clone value before modifying it?
XmmVar temp(c.newXmmVar());
c.pshufd(value, value, imm(0x1B)); // 00011011b
c.pshuflw(value, value, imm(0xB1)); // 10110001b
c.pshufhw(value, value, imm(0xB1)); // 10110001b
c.movdqa(temp, value);
c.psrlw(temp, imm(8));
c.psllw(value, imm(8));
c.por(value, temp);
GpVar byte_swap_addr(c.newGpVar());
c.mov(byte_swap_addr, imm((sysint_t)&__xmm_byte_swap));
c.pshufb(value, xmmword_ptr(byte_swap_addr));
c.movaps(xmmword_ptr(real_address), value);
}