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PowerPC floating point little-endian [11 of 15]
http://sourceware.org/ml/libc-alpha/2013-07/msg00202.html Another little-endian fix. * sysdeps/powerpc/fpu_control.h (_FPU_GETCW): Rewrite using 64-bit int/double union. (_FPU_SETCW): Likewise. * sysdeps/powerpc/fpu/tst-setcontext-fpscr.c (_GET_DI_FPSCR): Likewise. (_SET_DI_FPSCR, _GET_SI_FPSCR, _SET_SI_FPSCR): Likewise.
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Alan Modra
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da13146da1
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9c008155b7
@ -1,3 +1,11 @@
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2013-10-04 Alan Modra <amodra@gmail.com>
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* sysdeps/powerpc/fpu_control.h (_FPU_GETCW): Rewrite using
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64-bit int/double union.
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(_FPU_SETCW): Likewise.
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* sysdeps/powerpc/fpu/tst-setcontext-fpscr.c (_GET_DI_FPSCR): Likewise.
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(_SET_DI_FPSCR, _GET_SI_FPSCR, _SET_SI_FPSCR): Likewise.
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2013-10-04 Alan Modra <amodra@gmail.com>
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* sysdeps/powerpc/fpu/s_llround.c (__llround): Rewrite.
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@ -83,7 +83,7 @@ ElfW(Addr) query_auxv(int type)
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return 0;
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}
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typedef unsigned long long di_fpscr_t __attribute__ ((__mode__ (__DI__)));
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typedef unsigned int di_fpscr_t __attribute__ ((__mode__ (__DI__)));
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typedef unsigned int si_fpscr_t __attribute__ ((__mode__ (__SI__)));
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#define _FPSCR_RESERVED 0xfffffff8ffffff04ULL
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@ -95,50 +95,51 @@ typedef unsigned int si_fpscr_t __attribute__ ((__mode__ (__SI__)));
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#define _FPSCR_TEST1_RN 0x0000000000000002ULL
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/* Macros for accessing the hardware control word on Power6[x]. */
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# define _GET_DI_FPSCR(__fpscr) ({ \
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union { double d; \
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di_fpscr_t fpscr; } \
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tmp __attribute__ ((__aligned__(8))); \
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__asm__ ("mffs 0; stfd%U0 0,%0" : "=m" (tmp.d) : : "fr0"); \
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(__fpscr)=tmp.fpscr; \
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tmp.fpscr; })
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#define _GET_DI_FPSCR(__fpscr) \
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({union { double d; di_fpscr_t fpscr; } u; \
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register double fr; \
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__asm__ ("mffs %0" : "=f" (fr)); \
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u.d = fr; \
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(__fpscr) = u.fpscr; \
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u.fpscr; \
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})
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/* We make sure to zero fp0 after we use it in order to prevent stale data
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/* We make sure to zero fp after we use it in order to prevent stale data
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in an fp register from making a test-case pass erroneously. */
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# define _SET_DI_FPSCR(__fpscr) { \
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union { double d; di_fpscr_t fpscr; } \
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tmp __attribute__ ((__aligned__(8))); \
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tmp.fpscr = __fpscr; \
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# define _SET_DI_FPSCR(__fpscr) \
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{ union { double d; di_fpscr_t fpscr; } u; \
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register double fr; \
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u.fpscr = __fpscr; \
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fr = u.d; \
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/* Set the entire 64-bit FPSCR. */ \
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__asm__ ("lfd%U0 0,%0; " \
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".machine push; " \
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__asm__ (".machine push; " \
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".machine \"power6\"; " \
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"mtfsf 255,0,1,0; " \
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".machine pop" : : "m" (tmp.d) : "fr0"); \
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tmp.d = 0; \
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__asm__("lfd%U0 0,%0" : : "m" (tmp.d) : "fr0"); \
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}
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"mtfsf 255,%0,1,0; " \
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".machine pop" : : "f" (fr)); \
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fr = 0.0; \
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}
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# define _GET_SI_FPSCR(__fpscr) ({ \
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union { double d; \
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si_fpscr_t cw[2]; } \
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tmp __attribute__ ((__aligned__(8))); \
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__asm__ ("mffs 0; stfd%U0 0,%0" : "=m" (tmp.d) : : "fr0"); \
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(__fpscr)=tmp.cw[1]; \
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tmp.cw[0]; })
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# define _GET_SI_FPSCR(__fpscr) \
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({union { double d; di_fpscr_t fpscr; } u; \
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register double fr; \
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__asm__ ("mffs %0" : "=f" (fr)); \
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u.d = fr; \
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(__fpscr) = (si_fpscr_t) u.fpscr; \
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(si_fpscr_t) u.fpscr; \
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})
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/* We make sure to zero fp0 after we use it in order to prevent stale data
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/* We make sure to zero fp after we use it in order to prevent stale data
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in an fp register from making a test-case pass erroneously. */
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# define _SET_SI_FPSCR(__fpscr) { \
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union { double d; si_fpscr_t fpscr[2]; } \
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tmp __attribute__ ((__aligned__(8))); \
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# define _SET_SI_FPSCR(__fpscr) \
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{ union { double d; di_fpscr_t fpscr; } u; \
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register double fr; \
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/* More-or-less arbitrary; this is a QNaN. */ \
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tmp.fpscr[0] = 0xFFF80000; \
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tmp.fpscr[1] = __fpscr; \
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__asm__ ("lfd%U0 0,%0; mtfsf 255,0" : : "m" (tmp.d) : "fr0"); \
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tmp.d = 0; \
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__asm__("lfd%U0 0,%0" : : "m" (tmp.d) : "fr0"); \
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}
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u.fpscr = 0xfff80000ULL << 32; \
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u.fpscr |= __fpscr & 0xffffffffULL; \
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fr = u.d; \
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__asm__ ("mtfsf 255,%0" : : "f" (fr)); \
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fr = 0.0; \
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}
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void prime_special_regs(int which)
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{
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@ -93,22 +93,26 @@ extern fpu_control_t __fpu_control;
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# define _FPU_IEEE 0x000000f0
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/* Type of the control word. */
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typedef unsigned int fpu_control_t __attribute__ ((__mode__ (__SI__)));
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typedef unsigned int fpu_control_t;
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/* Macros for accessing the hardware control word. */
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# define _FPU_GETCW(cw) ( { \
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union { double __d; fpu_control_t __cw[2]; } \
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__tmp __attribute__ ((__aligned__(8))); \
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__asm__ ("mffs 0; stfd%U0 0,%0" : "=m" (__tmp.__d) : : "fr0"); \
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(cw) = __tmp.__cw[1]; \
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__tmp.__cw[1]; } )
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# define _FPU_SETCW(cw) { \
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union { double __d; fpu_control_t __cw[2]; } \
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__tmp __attribute__ ((__aligned__(8))); \
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__tmp.__cw[0] = 0xFFF80000; /* More-or-less arbitrary; this is a QNaN. */ \
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__tmp.__cw[1] = (cw); \
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__asm__ ("lfd%U0 0,%0; mtfsf 255,0" : : "m" (__tmp.__d) : "fr0"); \
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}
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# define _FPU_GETCW(cw) \
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({union { double __d; unsigned long long __ll; } __u; \
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register double __fr; \
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__asm__ ("mffs %0" : "=f" (__fr)); \
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__u.__d = __fr; \
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(cw) = (fpu_control_t) __u.__ll; \
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(fpu_control_t) __u.__ll; \
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})
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# define _FPU_SETCW(cw) \
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{ union { double __d; unsigned long long __ll; } __u; \
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register double __fr; \
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__u.__ll = 0xfff80000LL << 32; /* This is a QNaN. */ \
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__u.__ll |= (cw) & 0xffffffffLL; \
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__fr = __u.__d; \
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__asm__ ("mtfsf 255,%0" : : "f" (__fr)); \
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}
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/* Default control word set at startup. */
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extern fpu_control_t __fpu_control;
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