[Mesa-dev] [PATCH 5/5] nv50/ir: detect when a SLCT is equivalent to a SET

[Karol Herbst]

On 21 October 2016 8:30:33 a.m. GMT+02:00, Ilia Mirkin <imirkin at alum.mit.edu> wrote:
>Signed-off-by: Ilia Mirkin <imirkin at alum.mit.edu>
>---
>.../drivers/nouveau/codegen/nv50_ir_peephole.cpp   | 23
>++++++++++++++++++----
> 1 file changed, 19 insertions(+), 4 deletions(-)
>
>diff --git a/src/gallium/drivers/nouveau/codegen/nv50_ir_peephole.cpp
>b/src/gallium/drivers/nouveau/codegen/nv50_ir_peephole.cpp
>index f6fce44..c555430 100644
>--- a/src/gallium/drivers/nouveau/codegen/nv50_ir_peephole.cpp
>+++ b/src/gallium/drivers/nouveau/codegen/nv50_ir_peephole.cpp
>@@ -637,10 +637,25 @@ ConstantFolding::expr(Instruction *i,
>       }
>       break;
>    case OP_SLCT:
>-      if (a->data.u32 != b->data.u32)
>-         return;
>-      res.data.u32 = a->data.u32;
>-      break;
>+      if (a->data.u32 == b->data.u32) {
>+         res.data.u32 = a->data.u32;
>+         break;
>+      }
>+      if ((a->data.u32 == 0 && b->data.u32 == 0xffffffff) ||
>+          (b->data.u32 == 0 && a->data.u32 == 0xffffffff)) {
>+         bld.setPosition(i, false);

why do you need the bld.setPosition here?

>+         CmpInstruction *ci = i->asCmp();
>+         i->op = OP_SET;
>+         i->dType = TYPE_U32;
>+         if (a->data.u32 == 0) {
>+            ci->setCond = inverseCondCode(ci->setCond);
>+            i->setSrc(1, i->getSrc(0));
>+         }
>+         i->setSrc(0, i->getSrc(2));
>+         i->moveSources(3, -1);
>+         ++foldCount;
>+      }
>+      return;
>    case OP_EXTBF: {
>       int offset = b->data.u32 & 0xff;
>       int width = (b->data.u32 >> 8) & 0xff;
>-- 
>2.7.3
>
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