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nvc0/ir: Handle OP_BFIND when folding constant expressions

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Signed-off-by: Tobias Klausmann <tobias.johannes.klausmann@mni.thm.de>
Reviewed-by: Ilia Mirkin <imirkin@alum.mit.edu>
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Tobias Klausmann 2014-06-04 00:35:49 +02:00 • committed by Ilia Mirkin
parent 4674343e8f
commit fdc1d96b0f
1 changed files with 17 additions and 0 deletions
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17
src/gallium/drivers/nouveau/codegen/nv50_ir_peephole.cpp
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@ -940,6 +940,23 @@ ConstantFolding::opnd(Instruction *i, ImmediateValue &imm0, int s)
case OP_EX2:
unary(i, imm0);
break;
case OP_BFIND: {
int32_t res;
switch (i->dType) {
case TYPE_S32: res = util_last_bit_signed(imm0.reg.data.s32) - 1; break;
case TYPE_U32: res = util_last_bit(imm0.reg.data.u32) - 1; break;
default:
return;
}
if (i->subOp == NV50_IR_SUBOP_BFIND_SAMT && res >= 0)
res = 31 - res;
bld.setPosition(i, false); /* make sure bld is init'ed */
i->setSrc(0, bld.mkImm(res));
i->setSrc(1, NULL);
i->op = OP_MOV;
i->subOp = 0;
break;
}
default:
return;
}