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nir: simplify atan range reduction

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just implement what the comment says, don't be clever. the clever thing is worse
on all architectures i'm familiar with, because the fdiv will turn into
fmul+frcp.

Signed-off-by: Alyssa Rosenzweig <alyssa@rosenzweig.io>
Reviewed-by: Ian Romanick <ian.d.romanick@intel.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/30934>
This commit is contained in:
Alyssa Rosenzweig 2024-08-29 19:02:29 -04:00 • committed by Marge Bot
parent a32b1a975d
commit 8579375777
1 changed files with 2 additions and 2 deletions
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4
src/compiler/nir/nir_builtin_builder.c
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@ -174,8 +174,8 @@ nir_atan(nir_builder *b, nir_def *y_over_x)
* x = <
* \ 1.0 / |y_over_x| otherwise
*/
nir_def *x = nir_fdiv(b, nir_fmin(b, abs_y_over_x, one),
nir_fmax(b, abs_y_over_x, one));
nir_def *x = nir_bcsel(b, nir_fle_imm(b, abs_y_over_x, 1.0),
abs_y_over_x, nir_frcp(b, abs_y_over_x));
/*
* approximate atan by evaluating polynomial using Horner's method: