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radv/llvm: implement radv_enable_mrt_output_nan_fixup workaround

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Signed-off-by: Samuel Pitoiset <samuel.pitoiset@gmail.com>
Reviewed-by: Bas Nieuwenhuizen <bas@basnieuwenhuizen.nl>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/5359>
This commit is contained in:
Samuel Pitoiset
2020-06-05 15:05:07 +02:00
parent 7b44f549b3
commit 54e7ae569b
1 changed files with 24 additions and 0 deletions
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24
src/amd/vulkan/radv_nir_to_llvm.c
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@@ -1553,6 +1553,30 @@ si_llvm_init_export_args(struct radv_shader_context *ctx,
break;
}
/* Replace NaN by zero (only 32-bit) to fix game bugs if
* requested.
*/
if (ctx->args->options->enable_mrt_output_nan_fixup &&
!is_16bit &&
(col_format == V_028714_SPI_SHADER_32_R ||
col_format == V_028714_SPI_SHADER_32_GR ||
col_format == V_028714_SPI_SHADER_32_AR ||
col_format == V_028714_SPI_SHADER_32_ABGR ||
col_format == V_028714_SPI_SHADER_FP16_ABGR)) {
for (unsigned i = 0; i < 4; i++) {
LLVMValueRef args[2] = {
values[i],
LLVMConstInt(ctx->ac.i32, S_NAN | Q_NAN, false)
};
LLVMValueRef isnan =
ac_build_intrinsic(&ctx->ac, "llvm.amdgcn.class.f32", ctx->ac.i1,
args, 2, AC_FUNC_ATTR_READNONE);
values[i] = LLVMBuildSelect(ctx->ac.builder, isnan,
ctx->ac.f32_0,
values[i], "");
}
}
/* Pack f16 or norm_i16/u16. */
if (packf) {
for (chan = 0; chan < 2; chan++) {