Kenneth Graunke <kenn...@whitecape.org> writes: > I just botched this when writing the original code. > > From the ARB_vertex_program specification: > "The RSQ instruction approximates the reciprocal of the square root of > the absolute value of the scalar operand and replicates it to all four > components of the result vector." > > Fixes a Glean vertProg1 subtest: > RSQ test 2 (reciprocal square root of negative value) > > Cc: mesa-sta...@lists.freedesktop.org > Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=90547 > Signed-off-by: Kenneth Graunke <kenn...@whitecape.org>
Reviewed-by: Francisco Jerez <curroje...@riseup.net>
> ---
> src/mesa/program/prog_to_nir.c | 3 ++-
> 1 file changed, 2 insertions(+), 1 deletion(-)
>
> diff --git a/src/mesa/program/prog_to_nir.c b/src/mesa/program/prog_to_nir.c
> index e986e51..d3e3f15 100644
> --- a/src/mesa/program/prog_to_nir.c
> +++ b/src/mesa/program/prog_to_nir.c
> @@ -764,7 +764,8 @@ ptn_emit_instruction(struct ptn_compile *c, struct
> prog_instruction *prog_inst)
>
> switch (op) {
> case OPCODE_RSQ:
> - ptn_move_dest(b, dest, nir_frsq(b, ptn_channel(b, src[0], X)));
> + ptn_move_dest(b, dest,
> + nir_frsq(b, nir_fabs(b, ptn_channel(b, src[0], X))));
> break;
>
> case OPCODE_RCP:
> --
> 2.4.2
>
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