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radeonsi: use shared emit_umsb helper. 

Reviewed-by: Edward O'Callaghan <funfunctor@folklore1984.net>
Reviewed-by: Marek Olšák <marek.olsak@amd.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
This commit is contained in:
Dave Airlie 2017-02-16 03:54:19 +00:00
parent ebed22ec67
commit b0232d98e9
1 changed files with 2 additions and 22 deletions
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24
src/gallium/drivers/radeonsi/si_shader_tgsi_alu.c
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@ -555,30 +555,10 @@ static void emit_umsb(const struct lp_build_tgsi_action *action,
struct lp_build_tgsi_context *bld_base,
struct lp_build_emit_data *emit_data)
{
struct gallivm_state *gallivm = bld_base->base.gallivm;
LLVMBuilderRef builder = gallivm->builder;
LLVMValueRef args[2] = {
emit_data->args[0],
/* Don't generate code for handling zero: */
LLVMConstInt(LLVMInt1TypeInContext(gallivm->context), 1, 0)
};
struct si_shader_context *ctx = si_shader_context(bld_base);
LLVMValueRef msb =
lp_build_intrinsic(builder, "llvm.ctlz.i32",
emit_data->dst_type, args, ARRAY_SIZE(args),
LP_FUNC_ATTR_READNONE);
/* The HW returns the last bit index from MSB, but TGSI wants
* the index from LSB. Invert it by doing "31 - msb". */
msb = LLVMBuildSub(builder, lp_build_const_int32(gallivm, 31),
msb, "");
/* Check for zero: */
emit_data->output[emit_data->chan] =
LLVMBuildSelect(builder,
LLVMBuildICmp(builder, LLVMIntEQ, args[0],
bld_base->uint_bld.zero, ""),
lp_build_const_int32(gallivm, -1), msb, "");
ac_emit_umsb(&ctx->ac, emit_data->args[0], emit_data->dst_type);
}
/* Find the last bit opposite of the sign bit. */