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nv50/ir: remove dnz flag when converting MAD to ADD due to optimizations

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dnz flag only applies for multiplications (e.g. to make 0 * Infinity
becomes 0 instead of NaN). Once we optimize a MAD into an ADD, the dnz
flag no longer makes sense, and upsets the GM107 emitter (since it looks
at the ftz and dnz flags together).

Signed-off-by: Ilia Mirkin <imirkin@alum.mit.edu>
Reviewed-by: Karol Herbst <kherbst@redhat.com>
This commit is contained in:
Ilia Mirkin 2018-11-24 21:56:00 -05:00
parent d4e7d8b7f0
commit 927ce66b39
1 changed files with 3 additions and 0 deletions
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3
src/gallium/drivers/nouveau/codegen/nv50_ir_peephole.cpp
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@ -740,6 +740,7 @@ ConstantFolding::expr(Instruction *i,
// restrictions, so move it into a separate LValue.
bld.setPosition(i, false);
i->op = OP_ADD;
i->dnz = 0;
i->setSrc(1, bld.mkMov(bld.getSSA(type), i->getSrc(0), type)->getDef(0));
i->setSrc(0, i->getSrc(2));
i->src(0).mod = i->src(2).mod;
@ -1093,6 +1094,7 @@ ConstantFolding::opnd(Instruction *i, ImmediateValue &imm0, int s)
if (imm0.isNegative())
i->src(t).mod = i->src(t).mod ^ Modifier(NV50_IR_MOD_NEG);
i->op = OP_ADD;
i->dnz = 0;
i->setSrc(s, i->getSrc(t));
i->src(s).mod = i->src(t).mod;
} else
@ -1131,6 +1133,7 @@ ConstantFolding::opnd(Instruction *i, ImmediateValue &imm0, int s)
i->setSrc(1, i->getSrc(2));
i->src(1).mod = i->src(2).mod;
i->setSrc(2, NULL);
i->dnz = 0;
i->op = OP_ADD;
} else
if (!isFloatType(i->dType) && !i->subOp && !i->src(t).mod && !i->src(2).mod) {