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gallivm: Use llvm.roundeven in lp_build_round()

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`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>
This commit is contained in:
Matt Turner
2025-05-12 12:38:17 -04:00
committed by Marge Bot
parent 6458880594
commit eea3ed6a37
2 changed files with 2 additions and 8 deletions
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src/gallium/auxiliary/gallivm/lp_bld_arit.c
+1 -1
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);
}
src/gallium/auxiliary/gallivm/lp_bld_nir_soa.c
+1 -7
View File
@@ -3356,13 +3356,7 @@ 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]);