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authorChristoph Bumiller <[email protected]>2013-02-25 15:52:10 +0100
committerChristoph Bumiller <[email protected]>2013-03-12 12:55:36 +0100
commit9b563ef3f7473eeab476d3c57725d484d600382b (patch)
tree5fa7004aa2627facd767233697e9c3d1892bea5a /src/gallium/drivers/nv50
parenta788be19e5bb65432b7701f6d663501f3484151c (diff)
nv50/ir/opt: try to make use of SUCLAMP addend
Diffstat (limited to 'src/gallium/drivers/nv50')
-rw-r--r--src/gallium/drivers/nv50/codegen/nv50_ir_peephole.cpp45
1 files changed, 45 insertions, 0 deletions
diff --git a/src/gallium/drivers/nv50/codegen/nv50_ir_peephole.cpp b/src/gallium/drivers/nv50/codegen/nv50_ir_peephole.cpp
index 997d21aaf27..0af44baa8fc 100644
--- a/src/gallium/drivers/nv50/codegen/nv50_ir_peephole.cpp
+++ b/src/gallium/drivers/nv50/codegen/nv50_ir_peephole.cpp
@@ -933,6 +933,7 @@ private:
void handleSLCT(Instruction *);
void handleLOGOP(Instruction *);
void handleCVT(Instruction *);
+ void handleSUCLAMP(Instruction *);
BuildUtil bld;
};
@@ -1217,6 +1218,47 @@ AlgebraicOpt::handleCVT(Instruction *cvt)
delete_Instruction(prog, cvt);
}
+// SUCLAMP dst, (ADD b imm), k, 0 -> SUCLAMP dst, b, k, imm (if imm fits s6)
+void
+AlgebraicOpt::handleSUCLAMP(Instruction *insn)
+{
+ ImmediateValue imm;
+ int32_t val = insn->getSrc(2)->asImm()->reg.data.s32;
+ int s;
+ Instruction *add;
+
+ assert(insn->srcExists(0) && insn->src(0).getFile() == FILE_GPR);
+
+ // look for ADD (TODO: only count references by non-SUCLAMP)
+ if (insn->getSrc(0)->refCount() > 1)
+ return;
+ add = insn->getSrc(0)->getInsn();
+ if (!add || add->op != OP_ADD ||
+ (add->dType != TYPE_U32 &&
+ add->dType != TYPE_S32))
+ return;
+
+ // look for immediate
+ for (s = 0; s < 2; ++s)
+ if (add->src(s).getImmediate(imm))
+ break;
+ if (s >= 2)
+ return;
+ s = s ? 0 : 1;
+ // determine if immediate fits
+ val += imm.reg.data.s32;
+ if (val > 31 || val < -32)
+ return;
+ // determine if other addend fits
+ if (add->src(s).getFile() != FILE_GPR || add->src(s).mod != Modifier(0))
+ return;
+
+ bld.setPosition(insn, false); // make sure bld is init'ed
+ // replace sources
+ insn->setSrc(2, bld.mkImm(val));
+ insn->setSrc(0, add->getSrc(s));
+}
+
bool
AlgebraicOpt::visit(BasicBlock *bb)
{
@@ -1248,6 +1290,9 @@ AlgebraicOpt::visit(BasicBlock *bb)
case OP_CVT:
handleCVT(i);
break;
+ case OP_SUCLAMP:
+ handleSUCLAMP(i);
+ break;
default:
break;
}