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author | Joseph Myers <joseph@codesourcery.com> | 2015-02-13 16:20:36 +0000 |
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committer | Joseph Myers <joseph@codesourcery.com> | 2015-02-13 16:20:36 +0000 |
commit | 95c26233a1c7dd73a852a4f3bffd2d2eeba5e2fd (patch) | |
tree | f6e64cd9b63a30a3c22cb4200515f99b376acbf1 /sysdeps/sparc | |
parent | 3f293d614c9e641a0d96d347df5c1c5ee687762f (diff) | |
download | glibc-95c26233a1c7dd73a852a4f3bffd2d2eeba5e2fd.tar.gz glibc-95c26233a1c7dd73a852a4f3bffd2d2eeba5e2fd.tar.xz glibc-95c26233a1c7dd73a852a4f3bffd2d2eeba5e2fd.zip |
Fix powerpc software sqrtf (bug 17967).
Similarly to sqrt in <https://sourceware.org/ml/libc-alpha/2015-02/msg00353.html>, the powerpc sqrtf implementation for when _ARCH_PPCSQ is not defined also relies on a * b + c being contracted into a fused multiply-add. Although this contraction is not explicitly disabled for e_sqrtf.c, it still seems appropriate to make the file explicit about its requirements by using __builtin_fmaf; this patch does so. Furthermore, it turns out that doing so fixes the observed inaccuracy and missing exceptions (that is, that without explicit __builtin_fmaf usage, it was not being compiled as intended). Tested for powerpc32 (hard float). [BZ #17967] * sysdeps/powerpc/fpu/e_sqrtf.c (__slow_ieee754_sqrtf): Use __builtin_fmaf instead of relying on contraction of a * b + c.
Diffstat (limited to 'sysdeps/sparc')
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