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nir: Fix nir_fmax_abs_vec_comp

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This failed to take fabs of the first component, implementing an unintended
formula that would return the right results in some common cases but is wrong in
general:

   max { x, |y|, |z| }

instead of the intended

   max { |x|, |y|, |z| }

Reexpress the implementation to make correctness obvious.

Fixes: 272e927d0e ("nir/spirv: initial handling of OpenCL.std extension opcodes")
Signed-off-by: Alyssa Rosenzweig <alyssa@collabora.com>
Reviewed-by: Karol Herbst <kherbst@redhat.com>
Reviewed-by: Jason Ekstrand <jason.ekstrand@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/18754>
This commit is contained in:
Alyssa Rosenzweig 2022-10-13 17:18:09 -04:00 • committed by Marge Bot
parent 6fbb87851c
commit fc5c671e87
1 changed files with 3 additions and 2 deletions
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5
src/compiler/nir/nir_builtin_builder.h
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@ -62,9 +62,10 @@ nir_nan_check2(nir_builder *b, nir_ssa_def *x, nir_ssa_def *y, nir_ssa_def *res)
static inline nir_ssa_def *
nir_fmax_abs_vec_comp(nir_builder *b, nir_ssa_def *vec)
{
nir_ssa_def *res = nir_channel(b, vec, 0);
nir_ssa_def *abs = nir_fabs(b, vec);
nir_ssa_def *res = nir_channel(b, abs, 0);
for (unsigned i = 1; i < vec->num_components; ++i)
res = nir_fmax(b, res, nir_fabs(b, nir_channel(b, vec, i)));
res = nir_fmax(b, res, nir_channel(b, abs, i));
return res;
}