Module: Mesa Branch: master Commit: 796b73d1feeafa7ce128273f722409ad697bfdb4 URL: http://cgit.freedesktop.org/mesa/mesa/commit/?id=796b73d1feeafa7ce128273f722409ad697bfdb4
Author: Roland Scheidegger <[email protected]> Date: Sun Jul 14 02:38:13 2013 +0200 gallivm: (trivial) use constant instead of exp2f() function Some lame compilers can't do exp2f() and as far as I can tell they can't do exp2() (with doubles) neither so instead of providing some workaround for that (wouldn't actually be too bad just replace with pow) and since it is used with a constant only just use the precalculated constant. --- src/gallium/auxiliary/gallivm/lp_bld_format_srgb.c | 5 +++-- 1 files changed, 3 insertions(+), 2 deletions(-) diff --git a/src/gallium/auxiliary/gallivm/lp_bld_format_srgb.c b/src/gallium/auxiliary/gallivm/lp_bld_format_srgb.c index 217aaa9..f949a8d 100644 --- a/src/gallium/auxiliary/gallivm/lp_bld_format_srgb.c +++ b/src/gallium/auxiliary/gallivm/lp_bld_format_srgb.c @@ -170,6 +170,8 @@ lp_build_linear_to_srgb(struct gallivm_state *gallivm, */ float exp_f = 2.0f / 3.0f; + /* some compilers can't do exp2f, so this is exp2f(127.0f/exp_f - 127.0f) */ + float exp2f_c = 1.30438178253e+19f; float coeff_f = 0.62996f; LLVMValueRef pow_approx, coeff, x2, exponent, pow_1, pow_2; struct lp_type int_type = lp_int_type(src_type); @@ -179,8 +181,7 @@ lp_build_linear_to_srgb(struct gallivm_state *gallivm, */ exponent = lp_build_const_vec(gallivm, src_type, exp_f); coeff = lp_build_const_vec(gallivm, src_type, - exp2f(127.0f / exp_f - 127.0f) * - powf(coeff_f, 1.0f / exp_f)); + exp2f_c * powf(coeff_f, 1.0f / exp_f)); /* premultiply src */ tmp = lp_build_mul(&f32_bld, coeff, src); _______________________________________________ mesa-commit mailing list [email protected] http://lists.freedesktop.org/mailman/listinfo/mesa-commit
