Module: Mesa Branch: master Commit: 5161aff48af2fe0171be06fc727a000ad300fbd9 URL: http://cgit.freedesktop.org/mesa/mesa/commit/?id=5161aff48af2fe0171be06fc727a000ad300fbd9
Author: José Fonseca <[email protected]> Date: Wed Jul 20 14:53:59 2011 -0700 gallivm: Add a note about log2 computation and denormalized numbers. --- src/gallium/auxiliary/gallivm/lp_bld_arit.c | 6 ++++++ 1 files changed, 6 insertions(+), 0 deletions(-) diff --git a/src/gallium/auxiliary/gallivm/lp_bld_arit.c b/src/gallium/auxiliary/gallivm/lp_bld_arit.c index 0c075ba..2be8598 100644 --- a/src/gallium/auxiliary/gallivm/lp_bld_arit.c +++ b/src/gallium/auxiliary/gallivm/lp_bld_arit.c @@ -2465,6 +2465,12 @@ lp_build_log2_approx(struct lp_build_context *bld, assert(type.floating && type.width == 32); + /* + * We don't explicitly handle denormalized numbers. They will yield a + * result in the neighbourhood of -127, which appears to be adequate + * enough. + */ + i = LLVMBuildBitCast(builder, x, int_vec_type, ""); /* exp = (float) exponent(x) */ _______________________________________________ mesa-commit mailing list [email protected] http://lists.freedesktop.org/mailman/listinfo/mesa-commit
