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vtn/opencl: fix edge case behavior for tanpi
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Cc: mesa-stable
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/41726>
This commit is contained in:
Karol Herbst 2026-05-21 14:17:52 +02:00 • committed by Marge Bot
parent 1e9b1075b6
commit a6172f19a0
1 changed files with 15 additions and 0 deletions
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15
src/compiler/spirv/vtn_opencl.c
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@ -726,6 +726,21 @@ handle_special(struct vtn_builder *b, uint32_t opcode,
break;
}
case OpenCLstd_Tanpi: {
if (nb->fp_math_ctrl & nir_fp_preserve_signed_zero) {
nir_def *remainder = nir_fmod(nb, nir_fabs(nb, srcs[0]), nir_imm_floatN_t(nb, 2.0, ret->bit_size));
nir_def *is_odd = nir_feq_imm(nb, remainder, 1.0);
nir_def *is_even = nir_feq_imm(nb, remainder, 0.0);
/* tanpi(n) is copysign(0.0, - n) for odd integers n. */
ret = nir_bcsel(nb, is_odd, nir_copysign(nb, ret, nir_fneg(nb, srcs[0])), ret);
/* tanpi(n) is copysign(0.0, n) for even integers n. */
ret = nir_bcsel(nb, is_even, nir_copysign(nb, ret, srcs[0]), ret);
}
break;
}
default:
break;
}