Module: Mesa Branch: master Commit: d50e6128b815595f7918d6818e8a9cd20d53efd1 URL: http://cgit.freedesktop.org/mesa/mesa/commit/?id=d50e6128b815595f7918d6818e8a9cd20d53efd1
Author: Ilia Mirkin <[email protected]> Date: Sun Dec 6 23:49:48 2015 -0500 nv50/ir: attempt to do more constant folding on mad -> add conversion The add might actually have a 0 as an argument, which would convert it into a mov. Make sure to detect that. Also avoid the hack of putting the immediate directly into the instruction, instead use a mov to put it into place and let the later LoadPropagation pass place it if possible. Signed-off-by: Ilia Mirkin <[email protected]> --- .../drivers/nouveau/codegen/nv50_ir_peephole.cpp | 21 ++++++++++---------- 1 file changed, 10 insertions(+), 11 deletions(-) diff --git a/src/gallium/drivers/nouveau/codegen/nv50_ir_peephole.cpp b/src/gallium/drivers/nouveau/codegen/nv50_ir_peephole.cpp index c2842c2..f5c590e 100644 --- a/src/gallium/drivers/nouveau/codegen/nv50_ir_peephole.cpp +++ b/src/gallium/drivers/nouveau/codegen/nv50_ir_peephole.cpp @@ -676,23 +676,22 @@ ConstantFolding::expr(Instruction *i, switch (i->op) { case OP_MAD: case OP_FMA: { - i->op = OP_ADD; + ImmediateValue src0, src1 = *i->getSrc(0)->asImm(); - /* Move the immediate to the second arg, otherwise the ADD operation - * won't be emittable - */ - i->setSrc(1, i->getSrc(0)); + // Move the immediate into position 1, where we know it might be + // emittable. However it might not be anyways, as there may be other + // restrictions, so move it into a separate LValue. + bld.setPosition(i, false); + i->op = OP_ADD; + 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; i->setSrc(2, NULL); - ImmediateValue src0; if (i->src(0).getImmediate(src0)) - expr(i, src0, *i->getSrc(1)->asImm()); - if (i->saturate && !prog->getTarget()->isSatSupported(i)) { - bld.setPosition(i, false); - i->setSrc(1, bld.loadImm(NULL, res.data.u32)); - } + expr(i, src0, src1); + else + opnd(i, src1, 1); break; } case OP_PFETCH: _______________________________________________ mesa-commit mailing list [email protected] http://lists.freedesktop.org/mailman/listinfo/mesa-commit
