Mesa (master): nvc0/ir: Handle OP_BFIND when folding constant expressions
Ilia Mirkin
imirkin at kemper.freedesktop.org
Fri Jun 6 04:07:24 UTC 2014
Module: Mesa
Branch: master
Commit: fdc1d96b0ff59e163ed9fe894a1e6d08d4204b94
URL: http://cgit.freedesktop.org/mesa/mesa/commit/?id=fdc1d96b0ff59e163ed9fe894a1e6d08d4204b94
Author: Tobias Klausmann <tobias.johannes.klausmann at mni.thm.de>
Date: Wed Jun 4 00:35:49 2014 +0200
nvc0/ir: Handle OP_BFIND when folding constant expressions
Signed-off-by: Tobias Klausmann <tobias.johannes.klausmann at mni.thm.de>
Reviewed-by: Ilia Mirkin <imirkin at alum.mit.edu>
---
.../drivers/nouveau/codegen/nv50_ir_peephole.cpp | 17 +++++++++++++++++
1 file changed, 17 insertions(+)
diff --git a/src/gallium/drivers/nouveau/codegen/nv50_ir_peephole.cpp b/src/gallium/drivers/nouveau/codegen/nv50_ir_peephole.cpp
index 5254617..a91d698 100644
--- a/src/gallium/drivers/nouveau/codegen/nv50_ir_peephole.cpp
+++ b/src/gallium/drivers/nouveau/codegen/nv50_ir_peephole.cpp
@@ -940,6 +940,23 @@ ConstantFolding::opnd(Instruction *i, ImmediateValue &imm0, int s)
case OP_EX2:
unary(i, imm0);
break;
+ case OP_BFIND: {
+ int32_t res;
+ switch (i->dType) {
+ case TYPE_S32: res = util_last_bit_signed(imm0.reg.data.s32) - 1; break;
+ case TYPE_U32: res = util_last_bit(imm0.reg.data.u32) - 1; break;
+ default:
+ return;
+ }
+ if (i->subOp == NV50_IR_SUBOP_BFIND_SAMT && res >= 0)
+ res = 31 - res;
+ bld.setPosition(i, false); /* make sure bld is init'ed */
+ i->setSrc(0, bld.mkImm(res));
+ i->setSrc(1, NULL);
+ i->op = OP_MOV;
+ i->subOp = 0;
+ break;
+ }
default:
return;
}
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