diff options
Diffstat (limited to 'sysdeps/powerpc/fpu_control.h')
| -rw-r--r-- | sysdeps/powerpc/fpu_control.h | 76 |
1 files changed, 35 insertions, 41 deletions
diff --git a/sysdeps/powerpc/fpu_control.h b/sysdeps/powerpc/fpu_control.h index 9d0698b4fc..dc22a9293b 100644 --- a/sysdeps/powerpc/fpu_control.h +++ b/sysdeps/powerpc/fpu_control.h @@ -1,5 +1,5 @@ /* FPU control word definitions. PowerPC version. - Copyright (C) 1996-2018 Free Software Foundation, Inc. + Copyright (C) 1996-2019 Free Software Foundation, Inc. This file is part of the GNU C Library. The GNU C Library is free software; you can redistribute it and/or @@ -14,11 +14,15 @@ You should have received a copy of the GNU Lesser General Public License along with the GNU C Library; if not, see - <http://www.gnu.org/licenses/>. */ + <https://www.gnu.org/licenses/>. */ #ifndef _FPU_CONTROL_H #define _FPU_CONTROL_H +#if defined __SPE__ || (defined __NO_FPRS__ && !defined _SOFT_FLOAT) +# error "SPE/e500 is no longer supported" +#endif + #ifdef _SOFT_FLOAT # define _FPU_RESERVED 0xffffffff @@ -28,41 +32,6 @@ typedef unsigned int fpu_control_t; # define _FPU_SETCW(cw) (void) (cw) extern fpu_control_t __fpu_control; -#elif defined __NO_FPRS__ /* e500 */ - -/* rounding control */ -# define _FPU_RC_NEAREST 0x00 /* RECOMMENDED */ -# define _FPU_RC_DOWN 0x03 -# define _FPU_RC_UP 0x02 -# define _FPU_RC_ZERO 0x01 - -/* masking of interrupts */ -# define _FPU_MASK_ZM 0x10 /* zero divide */ -# define _FPU_MASK_OM 0x04 /* overflow */ -# define _FPU_MASK_UM 0x08 /* underflow */ -# define _FPU_MASK_XM 0x40 /* inexact */ -# define _FPU_MASK_IM 0x20 /* invalid operation */ - -# define _FPU_RESERVED 0x00c10080 /* These bits are reserved and not changed. */ - -/* Correct IEEE semantics require traps to be enabled at the hardware - level; the kernel then does the emulation and determines whether - generation of signals from those traps was enabled using prctl. */ -# define _FPU_DEFAULT 0x0000003c /* Default value. */ -# define _FPU_IEEE _FPU_DEFAULT - -/* Type of the control word. */ -typedef unsigned int fpu_control_t; - -/* Macros for accessing the hardware control word. */ -# define _FPU_GETCW(cw) \ - __asm__ volatile ("mfspefscr %0" : "=r" (cw)) -# define _FPU_SETCW(cw) \ - __asm__ volatile ("mtspefscr %0" : : "r" (cw)) - -/* Default control word set at startup. */ -extern fpu_control_t __fpu_control; - #else /* PowerPC 6xx floating-point. */ /* rounding control */ @@ -71,6 +40,8 @@ extern fpu_control_t __fpu_control; # define _FPU_RC_UP 0x02 # define _FPU_RC_ZERO 0x01 +# define _FPU_MASK_RC (_FPU_RC_NEAREST|_FPU_RC_DOWN|_FPU_RC_UP|_FPU_RC_ZERO) + # define _FPU_MASK_NI 0x04 /* non-ieee mode */ /* masking of interrupts */ @@ -96,20 +67,43 @@ typedef unsigned int fpu_control_t; /* Macros for accessing the hardware control word. */ # define _FPU_GETCW(cw) \ ({union { double __d; unsigned long long __ll; } __u; \ - register double __fr; \ - __asm__ ("mffs %0" : "=f" (__fr)); \ - __u.__d = __fr; \ + __asm__ __volatile__("mffs %0" : "=f" (__u.__d)); \ (cw) = (fpu_control_t) __u.__ll; \ (fpu_control_t) __u.__ll; \ }) +# define _FPU_GET_RC_ISA300() \ + ({union { double __d; unsigned long long __ll; } __u; \ + __asm__ __volatile__( \ + ".machine push; .machine \"power9\"; mffsl %0; .machine pop" \ + : "=f" (__u.__d)); \ + (fpu_control_t) (__u.__ll & _FPU_MASK_RC); \ + }) + +# ifdef _ARCH_PWR9 +# define _FPU_GET_RC() _FPU_GET_RC_ISA300() +# elif defined __BUILTIN_CPU_SUPPORTS__ +# define _FPU_GET_RC() \ + ({fpu_control_t __rc; \ + __rc = __glibc_likely (__builtin_cpu_supports ("arch_3_00")) \ + ? _FPU_GET_RC_ISA300 () \ + : _FPU_GETCW (__rc) & _FPU_MASK_RC; \ + __rc; \ + }) +# else +# define _FPU_GET_RC() \ + ({fpu_control_t __rc = _FPU_GETCW (__rc) & _FPU_MASK_RC; \ + __rc; \ + }) +# endif + # define _FPU_SETCW(cw) \ { union { double __d; unsigned long long __ll; } __u; \ register double __fr; \ __u.__ll = 0xfff80000LL << 32; /* This is a QNaN. */ \ __u.__ll |= (cw) & 0xffffffffLL; \ __fr = __u.__d; \ - __asm__ ("mtfsf 255,%0" : : "f" (__fr)); \ + __asm__ __volatile__("mtfsf 255,%0" : : "f" (__fr)); \ } /* Default control word set at startup. */ |