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author | Matheus Castanho <msc@linux.ibm.com> | 2020-03-03 15:20:38 -0300 |
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committer | Tulio Magno Quites Machado Filho <tuliom@linux.ibm.com> | 2020-03-06 11:10:12 -0300 |
commit | 1c252f0e7e5d78695f19450aa7c470bab445aa8e (patch) | |
tree | ff03c7d2393a6eae4cd7029ab44078508e94579e /math/libm-test-round.inc | |
parent | af09e5e5d9ec3ca20891e61a6922eac984fcbdc4 (diff) | |
download | glibc-1c252f0e7e5d78695f19450aa7c470bab445aa8e.tar.gz glibc-1c252f0e7e5d78695f19450aa7c470bab445aa8e.tar.xz glibc-1c252f0e7e5d78695f19450aa7c470bab445aa8e.zip |
powerpc: Fix feraiseexcept and feclearexcept macros
A recent change to fenvinline.h modified the check if __e is a a power of 2 inside feraiseexcept and feclearexcept macros. It introduced the use of the powerof2 macro but also removed the if statement checking whether __e != 0 before issuing an mtfsb* instruction. This is problematic because powerof2 (0) evaluates to 1 and without the removed if __e is allowed to be 0 when __builtin_clz is called. In that case the value 32 is passed to __MTFSB*, which is invalid. This commit uses __builtin_popcount instead of powerof2 to fix this issue and avoid the extra check for __e != 0. This was the approach used by the initial versions of that previous patch. Reviewed-by: Tulio Magno Quites Machado Filho <tuliom@linux.ibm.com>
Diffstat (limited to 'math/libm-test-round.inc')
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