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radv: lower 64-bit dfloor on GFX6 for fixing precision issues

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GFX6 doesn't support v_floor_f64 and the precision of v_fract_f64
which is used to implement 64-bit floor is less than what Vulkan
requires.

Signed-off-by: Samuel Pitoiset <samuel.pitoiset@gmail.com>
Reviewed-by: Daniel Schürmann <daniel@schuermann.dev>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/5609>
This commit is contained in:
Samuel Pitoiset
2020-06-24 09:15:47 +02:00
committed by Marge Bot
parent c84f11e7b6
commit a102896cff
3 changed files with 10 additions and 5 deletions
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8
src/amd/vulkan/radv_shader.c
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@@ -478,6 +478,14 @@ radv_shader_compile_to_nir(struct radv_device *device,
nir_lower_doubles_options lower_doubles =
nir->options->lower_doubles_options;
if (device->physical_device->rad_info.chip_class == GFX6) {
/* GFX6 doesn't support v_floor_f64 and the precision
* of v_fract_f64 which is used to implement 64-bit
* floor is less than what Vulkan requires.
*/
lower_doubles |= nir_lower_dfloor;
}
NIR_PASS_V(nir, nir_lower_doubles, NULL, lower_doubles);
}