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radeonsi: use a faster version of PK2H 

+ 4 piglit regressions, but it's correct accorcing to the GL spec and
performance is more important than piglit.

Reviewed-by: Nicolai Hähnle <nicolai.haehnle@amd.com>
This commit is contained in:
Marek Olšák 2017-08-19 22:51:51 +02:00
parent dc2ac03669
commit addd48194a
1 changed files with 8 additions and 21 deletions
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29
src/gallium/drivers/radeonsi/si_shader_tgsi_alu.c
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@ -656,27 +656,14 @@ static void emit_pk2h(const struct lp_build_tgsi_action *action,
struct lp_build_tgsi_context *bld_base,
struct lp_build_emit_data *emit_data)
{
LLVMBuilderRef builder = bld_base->base.gallivm->builder;
LLVMContextRef context = bld_base->base.gallivm->context;
struct lp_build_context *uint_bld = &bld_base->uint_bld;
LLVMTypeRef fp16, i16;
LLVMValueRef const16, comp[2];
unsigned i;
fp16 = LLVMHalfTypeInContext(context);
i16 = LLVMInt16TypeInContext(context);
const16 = lp_build_const_int32(uint_bld->gallivm, 16);
for (i = 0; i < 2; i++) {
comp[i] = LLVMBuildFPTrunc(builder, emit_data->args[i], fp16, "");
comp[i] = LLVMBuildBitCast(builder, comp[i], i16, "");
comp[i] = LLVMBuildZExt(builder, comp[i], uint_bld->elem_type, "");
}
comp[1] = LLVMBuildShl(builder, comp[1], const16, "");
comp[0] = LLVMBuildOr(builder, comp[0], comp[1], "");
emit_data->output[emit_data->chan] = comp[0];
/* From the GLSL 4.50 spec:
* "The rounding mode cannot be set and is undefined."
*
* v_cvt_pkrtz_f16 rounds to zero, but it's fastest.
*/
emit_data->output[emit_data->chan] =
ac_build_cvt_pkrtz_f16(&si_shader_context(bld_base)->ac,
emit_data->args);
}
static void up2h_fetch_args(struct lp_build_tgsi_context *bld_base,