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nv50/ir: Add support for MAD 4-byte opcode

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Add emission rules for negative and saturate flags for MAD 4-byte opcodes,
and get rid of some of the constraints. Obviously tested with a wide variety
of shaders.

V2: Document MAD as supported short form
V3: Split up IMM from short-form modifiers

Signed-off-by: Roy Spliet <rspliet@eclipso.eu>
Reviewed-by: Ilia Mirkin <imirkin@alum.mit.edu>
This commit is contained in:
Roy Spliet 2015-02-06 22:46:54 +01:00 • committed by Ilia Mirkin
parent 354206f407
commit fb63df2215
2 changed files with 6 additions and 8 deletions
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10
src/gallium/drivers/nouveau/codegen/nv50_ir_emit_nv50.cpp
View file

@ -941,7 +941,10 @@ CodeEmitterNV50::emitFMAD(const Instruction *i)
if (i->encSize == 4) {
emitForm_MUL(i);
assert(!neg_mul && !neg_add);
code[0] |= neg_mul << 15;
code[0] |= neg_add << 22;
if (i->saturate)
code[0] |= 1 << 8;
} else {
code[1] = neg_mul << 26;
code[1] |= neg_add << 27;
@ -1931,11 +1934,6 @@ CodeEmitterNV50::getMinEncodingSize(const Instruction *i) const
// check constraints on short MAD
if (info.srcNr >= 2 && i->srcExists(2)) {
if (i->saturate || i->src(2).mod)
return 8;
if ((i->src(0).mod ^ i->src(1).mod) ||
(i->src(0).mod | i->src(1).mod).abs())
return 8;
if (!i->defExists(0) ||
i->def(0).rep()->reg.data.id != i->src(2).rep()->reg.data.id)
return 8;

4
src/gallium/drivers/nouveau/codegen/nv50_ir_target_nv50.cpp
View file

@ -117,8 +117,8 @@ void TargetNV50::initOpInfo()
};
static const uint32_t shortForm[(OP_LAST + 31) / 32] =
{
// MOV,ADD,SUB,MUL,SAD,L/PINTERP,RCP,TEX,TXF
0x00010e40, 0x00000040, 0x00000498, 0x00000000
// MOV,ADD,SUB,MUL,MAD,SAD,L/PINTERP,RCP,TEX,TXF
0x00014e40, 0x00000040, 0x00000498, 0x00000000
};
static const operation noDestList[] =
{