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st/nir: Don't use GLSL IR's MOD_TO_FLOOR lowering when using NIR.

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Both GLSL IR and NIR perform the same mod -> floor lowering for 32-bit
types.  But nir_lower_double_ops is slightly more defensive against
lowered drcp precision loss, and handles mod(x, x) = 0 directly.  This
works well...assuming nir_lower_double_ops actually gets an fmod op to
lower in the first place.

The previous patches enabled NIR-based lowering for the remaining
drivers, so we can stop using the GLSL IR lowering when using NIR.

Fixes KHR-GL45.gpu_shader_fp64.builtin.mod_dvec[234] on iris.

Reviewed-by: Marek Olšák <marek.olsak@amd.com>
This commit is contained in:
Kenneth Graunke 2019-05-16 22:41:13 -07:00
parent f4d4c42608
commit 4f3c82c72c
1 changed files with 1 additions and 1 deletions
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2
src/mesa/state_tracker/st_glsl_to_ir.cpp
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@ -121,7 +121,7 @@ st_link_shader(struct gl_context *ctx, struct gl_shader_program *prog)
shader, ctx->Extensions.KHR_blend_equation_advanced_coherent);
lower_instructions(ir,
MOD_TO_FLOOR |
(use_nir ? 0 : MOD_TO_FLOOR) |
FDIV_TO_MUL_RCP |
EXP_TO_EXP2 |
LOG_TO_LOG2 |