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gallium: add fp16_no_denorms cap

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Rusticl has to know whether a driver always flushes fp16 denorms in order
to set the correct nir float execution mode.

Reviewed-by: Adam Jackson <ajax@redhat.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/41703>
This commit is contained in:
Karol Herbst 2026-05-20 01:59:14 +02:00 • committed by Marge Bot
parent 5a8d4b28b5
commit d1af3d95c7
4 changed files with 11 additions and 2 deletions
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1
src/gallium/drivers/freedreno/freedreno_screen.c
View file

@ -275,6 +275,7 @@ fd_init_shader_caps(struct fd_screen *screen)
(is_a5xx(screen) || is_a6xx(screen)) &&
(i == MESA_SHADER_COMPUTE || i == MESA_SHADER_FRAGMENT) &&
!FD_DBG(NOFP16);
caps->fp16_no_denorms = caps->fp16 && screen->gen < 8;
caps->glsl_16bit_load_dst = true;
caps->max_texture_samplers =

2
src/gallium/drivers/zink/zink_screen.c
View file

@ -631,6 +631,8 @@ zink_init_shader_caps(struct zink_screen *screen)
screen->info.feats12.shaderFloat16 ||
(screen->info.have_KHR_shader_float16_int8 &&
screen->info.shader_float16_int8_feats.shaderFloat16);
caps->fp16_no_denorms = caps->fp16 && !screen->info.props12.shaderDenormPreserveFloat16
&& screen->info.props12.shaderDenormFlushToZeroFloat16;
caps->glsl_16bit_load_dst = true;
caps->int16 = screen->info.feats.features.shaderInt16;

9
src/gallium/frontends/rusticl/core/device.rs
View file

@ -1389,12 +1389,17 @@ impl DeviceBase {
}
pub fn spirv_to_nir_opts(&self) -> SPIRVToNirOptions {
let spirv_float_controls = float_controls::FLOAT_CONTROLS_DENORM_PRESERVE_FP16
| float_controls::FLOAT_CONTROLS_DENORM_FLUSH_TO_ZERO_FP32
let mut spirv_float_controls = float_controls::FLOAT_CONTROLS_DENORM_FLUSH_TO_ZERO_FP32
| float_controls::FLOAT_CONTROLS_ROUNDING_MODE_RTE_FP16
| float_controls::FLOAT_CONTROLS_ROUNDING_MODE_RTE_FP32
| float_controls::FLOAT_CONTROLS_ROUNDING_MODE_RTE_FP64;
if self.shader_caps().fp16_no_denorms {
spirv_float_controls |= float_controls::FLOAT_CONTROLS_DENORM_FLUSH_TO_ZERO_FP16;
} else {
spirv_float_controls |= float_controls::FLOAT_CONTROLS_DENORM_PRESERVE_FP16;
}
SPIRVToNirOptions {
caps: &self.spirv_caps,
address_bits: self.address_bits(),

1
src/gallium/include/pipe/p_defines.h
View file

@ -802,6 +802,7 @@ struct pipe_shader_caps {
bool fp16;
bool fp16_derivatives;
bool fp16_const_buffers;
bool fp16_no_denorms;
bool int16;
bool glsl_16bit_consts;
bool glsl_16bit_load_dst; /* fp16 or int16 is AND'ed with this */