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nv50/ir: constant fold OP_SPLIT

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Split the source immediate value into new values and move them into the
original defs set by the split. Since we can only have up to 64-bit
immediates, this is largely beneficial for F64 (and, in the future, U64)
operations.

Signed-off-by: Tobias Klausmann <tobias.johannes.klausmann@mni.thm.de>
[imirkin: always use U32, set newi for foldCount tracking]
Signed-off-by: Ilia Mirkin <imirkin@alum.mit.edu>
This commit is contained in:
Tobias Klausmann 2016-09-30 23:50:15 +02:00 • committed by Ilia Mirkin
parent 75128d6ffd
commit b7d9677de8
1 changed files with 18 additions and 0 deletions
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18
src/gallium/drivers/nouveau/codegen/nv50_ir_peephole.cpp
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@ -932,6 +932,24 @@ ConstantFolding::opnd(Instruction *i, ImmediateValue &imm0, int s)
Instruction *newi = i;
switch (i->op) {
case OP_SPLIT: {
bld.setPosition(i, false);
uint8_t size = i->getDef(0)->reg.size;
uint32_t mask = (1ULL << size) - 1;
assert(size <= 32);
uint64_t val = imm0.reg.data.u64;
for (int8_t d = 0; i->defExists(d); ++d) {
Value *def = i->getDef(d);
assert(def->reg.size == size);
newi = bld.mkMov(def, bld.mkImm((uint32_t)(val & mask)), TYPE_U32);
val >>= size;
}
delete_Instruction(prog, i);
break;
}
case OP_MUL:
if (i->dType == TYPE_F32)
tryCollapseChainedMULs(i, s, imm0);