ShuriZma
/
xenia-canary
mirror of https://github.com/xenia-canary/xenia-canary.git
1
0
Fork 0
Code Issues Packages Projects Releases Wiki Activity

Adding hlide's comments for EXTRACT - need to implement/test.

This commit is contained in:
Ben Vanik 2014-05-30 14:02:15 -07:00
parent 691a3d4ade
commit d65b5801f8
1 changed files with 22 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

23
src/alloy/backend/x64/x64_sequences.cc
View File

@ -4413,6 +4413,12 @@ EMITTER(EXTRACT_I8, MATCH(I<OPCODE_EXTRACT, I8<>, V128<>, I8<>>)) {
e.vpextrb(i.dest.reg().cvt32(), i.src1, VEC128_B(i.src2.constant()));
} else {
XEASSERTALWAYS();
// TODO(benvanik): try out hlide's version:
// mov eax, 0x80808080
// mov al, i.src2
// vmovd xmm0, eax
// vpshufb xmm0, i.src1, xmm0
// vmovd i.dest.reg().cvt32(), xmm0
}
}
};
@ -4421,6 +4427,14 @@ EMITTER(EXTRACT_I16, MATCH(I<OPCODE_EXTRACT, I16<>, V128<>, I8<>>)) {
if (i.src2.is_constant) {
e.vpextrw(i.dest.reg().cvt32(), i.src1, VEC128_W(i.src2.constant()));
} else {
// TODO(benvanik): try out hlide's version:
// xor eax, eax
// mov al, i.src2 // eax = [i, 0, 0, 0]
// imul eax, eax, 0x00000202 // [i*2, i*2, 0, 0] supposedly that 0<= i < 8
// add eax,0x80800100 // [i*2+0b00, i*2+0b01, 0x80, 0x80]
// vmovd xmm0, eax
// vpshufb xmm0, i.src1, xmm0
// vmovd i.dest.reg().cvt32(), xmm0
XEASSERTALWAYS();
}
}
@ -4436,8 +4450,15 @@ EMITTER(EXTRACT_I32, MATCH(I<OPCODE_EXTRACT, I32<>, V128<>, I8<>>)) {
if (i.src2.is_constant) {
e.vpextrd(i.dest, i.src1, VEC128_D(i.src2.constant()));
} else {
// TODO(benvanik): try out hlide's version:
// xor eax, eax
// mov al, i.src2 // eax = [i, 0, 0, 0]
// imul eax, eax, 0x04040404 // [i*4, i*4, i*4, i*4] supposedly that 0<= i < 4
// add eax,0x03020100 // [i*4+0b00, i*4+0b01, i*4+0b10, i*4+0b11]
// vmovd xmm0, eax
// vpshufb xmm0, i.src1, xmm0
// vmovd i.dest.reg().cvt32(), xmm0
// Get the desired word in xmm0, then extract that.
// TODO(benvanik): find a better way, this sequence is terrible.
e.xor(e.rax, e.rax);
e.mov(e.al, i.src2);
e.and(e.al, 0x03);