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More efficient 11111... vec loading.

This commit is contained in:
Ben Vanik 2014-05-27 11:57:20 -07:00
parent 16bac6d9c5
commit d85665bb06
2 changed files with 3 additions and 5 deletions
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7
src/alloy/backend/x64/x64_emitter.cc
View File

@ -443,7 +443,6 @@ Address X64Emitter::GetXmmConstPtr(XmmConst id) {
/* XMMUnpackD3DCOLOR */ vec128i(0xFFFFFF02, 0xFFFFFF01, 0xFFFFFF00, 0xFFFFFF02),
/* XMMOneOver255 */ vec128f(1.0f / 255.0f, 1.0f / 255.0f, 1.0f / 255.0f, 1.0f / 255.0f),
/* XMMShiftMaskPS */ vec128i(0x0000001Fu, 0x0000001Fu, 0x0000001Fu, 0x0000001Fu),
/* XMMOneMask */ vec128i(0xFFFFFFFFu, 0xFFFFFFFFu, 0xFFFFFFFFu, 0xFFFFFFFFu),
};
// TODO(benvanik): cache base pointer somewhere? stack? It'd be nice to
// prevent this move.
@ -461,7 +460,7 @@ void X64Emitter::LoadConstantXmm(Xbyak::Xmm dest, const vec128_t& v) {
vpxor(dest, dest);
} else if (v.low == ~0ull && v.high == ~0ull) {
// 1111...
vmovaps(dest, GetXmmConstPtr(XMMOneMask));
vpcmpeqb(dest, dest);
} else {
// TODO(benvanik): see what other common values are.
// TODO(benvanik): build constant table - 99% are reused.
@ -481,7 +480,7 @@ void X64Emitter::LoadConstantXmm(Xbyak::Xmm dest, float v) {
vpxor(dest, dest);
} else if (x.i == ~0UL) {
// 1111...
vmovaps(dest, GetXmmConstPtr(XMMOneMask));
vpcmpeqb(dest, dest);
} else {
// TODO(benvanik): see what other common values are.
// TODO(benvanik): build constant table - 99% are reused.
@ -500,7 +499,7 @@ void X64Emitter::LoadConstantXmm(Xbyak::Xmm dest, double v) {
vpxor(dest, dest);
} else if (x.i == ~0ULL) {
// 1111...
vmovaps(dest, GetXmmConstPtr(XMMOneMask));
vpcmpeqb(dest, dest);
} else {
// TODO(benvanik): see what other common values are.
// TODO(benvanik): build constant table - 99% are reused.

1
src/alloy/backend/x64/x64_emitter.h
View File

@ -51,7 +51,6 @@ enum XmmConst {
XMMUnpackD3DCOLOR = 12,
XMMOneOver255 = 13,
XMMShiftMaskPS = 14,
XMMOneMask = 15,
};
// Unfortunately due to the design of xbyak we have to pass this to the ctor.