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authorKarol Herbst <[email protected]>2016-01-27 18:25:05 +0100
committerIlia Mirkin <[email protected]>2016-01-28 15:34:22 -0500
commit978ae28ca279354852a586b202e705db3d596041 (patch)
treeaa35f2ce62383b7038411f33b0b7570f906b0e28 /src/gallium
parent089f60543930fcdab3848d59e6182abcaaeb1b86 (diff)
nv50/ir: optimize shl(shr(a, c), c) to and(a, ~((1 << c) - 1))
Following shader-db results on GK110: total instructions in shared programs : 6141510 -> 6131491 (-0.16%) total gprs used in shared programs : 910187 -> 910157 (-0.00%) total local used in shared programs : 15328 -> 15328 (0.00%) local gpr inst bytes helped 0 18 821 821 hurt 0 0 0 0 Signed-off-by: Karol Herbst <[email protected]> Reviewed-by: Ilia Mirkin <[email protected]>
Diffstat (limited to 'src/gallium')
-rw-r--r--src/gallium/drivers/nouveau/codegen/nv50_ir_peephole.cpp8
1 files changed, 8 insertions, 0 deletions
diff --git a/src/gallium/drivers/nouveau/codegen/nv50_ir_peephole.cpp b/src/gallium/drivers/nouveau/codegen/nv50_ir_peephole.cpp
index 95e9fdfc57d..b2c9fdfc7a4 100644
--- a/src/gallium/drivers/nouveau/codegen/nv50_ir_peephole.cpp
+++ b/src/gallium/drivers/nouveau/codegen/nv50_ir_peephole.cpp
@@ -1202,6 +1202,14 @@ ConstantFolding::opnd(Instruction *i, ImmediateValue &imm0, int s)
i->setSrc(1, bld.loadImm(NULL, imm0.reg.data.u32 + imm1.reg.data.u32));
}
break;
+ case OP_SHR:
+ if (si->src(1).getImmediate(imm1) && imm0.reg.data.u32 == imm1.reg.data.u32) {
+ bld.setPosition(i, false);
+ i->op = OP_AND;
+ i->setSrc(0, si->getSrc(0));
+ i->setSrc(1, bld.loadImm(NULL, ~((1 << imm0.reg.data.u32) - 1)));
+ }
+ break;
case OP_MUL:
int muls;
if (isFloatType(si->dType))