diff options
Diffstat (limited to 'src/mesa')
| -rw-r--r-- | src/mesa/drivers/dri/i965/brw_vec4_nir.cpp | 18 |
1 files changed, 5 insertions, 13 deletions
diff --git a/src/mesa/drivers/dri/i965/brw_vec4_nir.cpp b/src/mesa/drivers/dri/i965/brw_vec4_nir.cpp index 0093c7dc9d4..8ca8ddb98fb 100644 --- a/src/mesa/drivers/dri/i965/brw_vec4_nir.cpp +++ b/src/mesa/drivers/dri/i965/brw_vec4_nir.cpp @@ -1301,26 +1301,18 @@ vec4_visitor::nir_emit_alu(nir_alu_instr *instr) case nir_op_ufind_msb: case nir_op_ifind_msb: { - src_reg temp = src_reg(this, glsl_type::uint_type); - - inst = emit(FBH(dst_reg(temp), op[0])); - inst->dst.writemask = WRITEMASK_XYZW; + emit(FBH(retype(dst, BRW_REGISTER_TYPE_UD), op[0])); /* FBH counts from the MSB side, while GLSL's findMSB() wants the count * from the LSB side. If FBH didn't return an error (0xFFFFFFFF), then * subtract the result from 31 to convert the MSB count into an LSB count. */ + src_reg src(dst); + emit(CMP(dst_null_d(), src, src_reg(-1), BRW_CONDITIONAL_NZ)); - /* FBH only supports UD type for dst, so use a MOV to convert UD to D. */ - temp.swizzle = BRW_SWIZZLE_NOOP; - emit(MOV(dst, temp)); - - src_reg src_tmp = src_reg(dst); - emit(CMP(dst_null_d(), src_tmp, src_reg(-1), BRW_CONDITIONAL_NZ)); - - src_tmp.negate = true; - inst = emit(ADD(dst, src_tmp, src_reg(31))); + inst = emit(ADD(dst, src, src_reg(31))); inst->predicate = BRW_PREDICATE_NORMAL; + inst->src[0].negate = true; break; } |