fdo-mirrors/mesa
1
0
Fork 0
mirror of https://gitlab.freedesktop.org/mesa/mesa.git synced 2026-01-31 02:40:25 +01:00
Code Issues Projects Releases Packages Wiki Activity Actions 3

gallivm: Use llvm.roundeven in lp_build_round()

Browse source 
`lp_build_round` intends to implement round with ties-to-even behavior,
as can be seen by its test's use of `nearbyint` to generate reference
values and by it use in implementing `nir_op_fround_even`.

Fixes: 0d3b285360 ("gallivm: use llvm intrinsics for 16-bit round/trunc/roundeven")
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/34937>
(cherry picked from commit eea3ed6a37)
This commit is contained in:
Matt Turner 2025-05-12 12:38:17 -04:00 • committed by Eric Engestrom
parent dda7d88800
commit 4bd75f552c
3 changed files with 3 additions and 9 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

2
.pick_status.json
View file

@ -284,7 +284,7 @@
"description": "gallivm: Use `llvm.roundeven` in lp_build_round()",
"nominated": true,
"nomination_type": 2,
"resolution": 0,
"resolution": 1,
"main_sha": null,
"because_sha": "0d3b2853600cf6934a3a09deaf435944d18d833a",
"notes": null

2
src/gallium/auxiliary/gallivm/lp_bld_arit.c
View file

@ -2120,7 +2120,7 @@ lp_build_round(struct lp_build_context *bld,
if (type.width == 16) {
char intrinsic[64];
lp_format_intrinsic(intrinsic, 64, "llvm.round", bld->vec_type);
lp_format_intrinsic(intrinsic, 64, "llvm.roundeven", bld->vec_type);
return lp_build_intrinsic_unary(builder, intrinsic, bld->vec_type, a);
}

8
src/gallium/auxiliary/gallivm/lp_bld_nir_soa.c
View file

@ -3343,13 +3343,7 @@ do_alu_action(struct lp_build_nir_soa_context *bld,
result = lp_build_rcp(float_bld, src[0]);
break;
case nir_op_fround_even:
if (src_bit_size[0] == 16) {
char intrinsic[64];
lp_format_intrinsic(intrinsic, 64, "llvm.roundeven", float_bld->vec_type);
result = lp_build_intrinsic_unary(builder, intrinsic, float_bld->vec_type, src[0]);
} else {
result = lp_build_round(float_bld, src[0]);
}
result = lp_build_round(float_bld, src[0]);
break;
case nir_op_frsq:
result = lp_build_rsqrt(float_bld, src[0]);