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PR optimization/10764 * config/i386/i386.md (atan2df3, atan2sf3, atan2xf3, atan2tf3): Add an explicit clobber to show that UNSPEC_FPATAN clobbers st(1). (*fyl2x_sfxf3, *fyl2x_dfxf3, *fyl2x_xf3, *fyl2x_tfxf3): Likewise, add an explicit clobber to show that UNSPEC_FYL2X clobbers st(1). (logsf2, logdf2, logxf2, logtf2): Update expander patterns to match the corresponding *fyl2x_?fxf3 instructions. * gcc.dg/builtins-15.c: New test case. From-SVN: r66811
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