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c86ed71d63
This patch enables float128 support for x86_64 and x86. All GCC versions that can build glibc provide the required support, but since GCC 6 and before don't provide __builtin_nanq / __builtin_nansq, sNaN tests and some tests of NaN payloads need to be disabled with such compilers (this does not affect the generated glibc binaries at all, just the tests). bits/floatn.h declares float128 support to be available for GCC versions that provide the required libgcc support (4.3 for x86_64, 4.4 for i386 GNU/Linux, 4.5 for i386 GNU/Hurd); compilation-only support was present some time before then, but not really useful without the libgcc functions. fenv_private.h needed updating to avoid trying to put _Float128 values in registers. I make no assertion of optimality of the math_opt_barrier / math_force_eval definitions for this case; they are simply intended to be sufficient to work correctly. Tested for x86_64 and x86, with GCC 7 and GCC 6. (Testing for x32 was compilation tests only with build-many-glibcs.py to verify the ABI baseline updates. I have not done any testing for Hurd, although the float128 support is enabled there as for GNU/Linux.) * sysdeps/i386/Implies: Add ieee754/float128. * sysdeps/x86_64/Implies: Likewise. * sysdeps/x86/bits/floatn.h: New file. * sysdeps/x86/float128-abi.h: Likewise. * manual/math.texi (Mathematics): Document support for _Float128 on x86_64 and x86. * sysdeps/i386/fpu/fenv_private.h: Include <bits/floatn.h>. (math_opt_barrier): Do not put _Float128 values in floating-point registers. (math_force_eval): Likewise. [__x86_64__] (SET_RESTORE_ROUNDF128): New macro. * sysdeps/x86/fpu/Makefile [$(subdir) = math] (CPPFLAGS): Append to Makefile variable. * sysdeps/x86/fpu/e_sqrtf128.c: New file. * sysdeps/x86/fpu/sfp-machine.h: Likewise. Based on libgcc. * sysdeps/x86/math-tests.h: New file. * math/libm-test-support.h (XFAIL_FLOAT128_PAYLOAD): New macro. * math/libm-test-getpayload.inc (getpayload_test_data): Use XFAIL_FLOAT128_PAYLOAD. * math/libm-test-setpayload.inc (setpayload_test_data): Likewise. * math/libm-test-totalorder.inc (totalorder_test_data): Likewise. * math/libm-test-totalordermag.inc (totalordermag_test_data): Likewise. * sysdeps/unix/sysv/linux/i386/libc.abilist: Update. * sysdeps/unix/sysv/linux/i386/libm.abilist: Likewise. * sysdeps/unix/sysv/linux/x86_64/64/libc.abilist: Likewise. * sysdeps/unix/sysv/linux/x86_64/64/libm.abilist: Likewise. * sysdeps/unix/sysv/linux/x86_64/x32/libc.abilist: Likewise. * sysdeps/unix/sysv/linux/x86_64/x32/libm.abilist: Likewise. * sysdeps/i386/fpu/libm-test-ulps: Likewise. * sysdeps/i386/i686/fpu/multiarch/libm-test-ulps: Likewise. * sysdeps/x86_64/fpu/libm-test-ulps: Likewise.
210 lines
6.4 KiB
C
210 lines
6.4 KiB
C
/* Configure soft-fp for building sqrtf128. Based on sfp-machine.h in
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libgcc, with soft-float and other irrelevant parts removed. */
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/* The type of the result of a floating point comparison. This must
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match `__libgcc_cmp_return__' in GCC for the target. */
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typedef int __gcc_CMPtype __attribute__ ((mode (__libgcc_cmp_return__)));
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#define CMPtype __gcc_CMPtype
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#ifdef __x86_64__
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# define _FP_W_TYPE_SIZE 64
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# define _FP_W_TYPE unsigned long long
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# define _FP_WS_TYPE signed long long
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# define _FP_I_TYPE long long
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typedef int TItype __attribute__ ((mode (TI)));
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typedef unsigned int UTItype __attribute__ ((mode (TI)));
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# define TI_BITS (__CHAR_BIT__ * (int)sizeof(TItype))
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# define _FP_MUL_MEAT_Q(R,X,Y) \
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_FP_MUL_MEAT_2_wide(_FP_WFRACBITS_Q,R,X,Y,umul_ppmm)
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# define _FP_DIV_MEAT_Q(R,X,Y) _FP_DIV_MEAT_2_udiv(Q,R,X,Y)
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# define _FP_NANFRAC_S _FP_QNANBIT_S
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# define _FP_NANFRAC_D _FP_QNANBIT_D
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# define _FP_NANFRAC_E _FP_QNANBIT_E, 0
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# define _FP_NANFRAC_Q _FP_QNANBIT_Q, 0
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# define FP_EX_SHIFT 7
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# define _FP_DECL_EX \
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unsigned int _fcw __attribute__ ((unused)) = FP_RND_NEAREST;
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# define FP_RND_NEAREST 0
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# define FP_RND_ZERO 0x6000
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# define FP_RND_PINF 0x4000
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# define FP_RND_MINF 0x2000
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# define FP_RND_MASK 0x6000
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# define FP_INIT_ROUNDMODE \
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do { \
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__asm__ __volatile__ ("%vstmxcsr\t%0" : "=m" (_fcw)); \
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} while (0)
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#else
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# define _FP_W_TYPE_SIZE 32
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# define _FP_W_TYPE unsigned int
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# define _FP_WS_TYPE signed int
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# define _FP_I_TYPE int
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# define __FP_FRAC_ADD_4(r3,r2,r1,r0,x3,x2,x1,x0,y3,y2,y1,y0) \
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__asm__ ("add{l} {%11,%3|%3,%11}\n\t" \
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"adc{l} {%9,%2|%2,%9}\n\t" \
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"adc{l} {%7,%1|%1,%7}\n\t" \
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"adc{l} {%5,%0|%0,%5}" \
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: "=r" ((USItype) (r3)), \
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"=&r" ((USItype) (r2)), \
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"=&r" ((USItype) (r1)), \
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"=&r" ((USItype) (r0)) \
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: "%0" ((USItype) (x3)), \
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"g" ((USItype) (y3)), \
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"%1" ((USItype) (x2)), \
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"g" ((USItype) (y2)), \
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"%2" ((USItype) (x1)), \
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"g" ((USItype) (y1)), \
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"%3" ((USItype) (x0)), \
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"g" ((USItype) (y0)))
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# define __FP_FRAC_ADD_3(r2,r1,r0,x2,x1,x0,y2,y1,y0) \
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__asm__ ("add{l} {%8,%2|%2,%8}\n\t" \
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"adc{l} {%6,%1|%1,%6}\n\t" \
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"adc{l} {%4,%0|%0,%4}" \
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: "=r" ((USItype) (r2)), \
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"=&r" ((USItype) (r1)), \
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"=&r" ((USItype) (r0)) \
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: "%0" ((USItype) (x2)), \
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"g" ((USItype) (y2)), \
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"%1" ((USItype) (x1)), \
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"g" ((USItype) (y1)), \
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"%2" ((USItype) (x0)), \
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"g" ((USItype) (y0)))
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# define __FP_FRAC_SUB_4(r3,r2,r1,r0,x3,x2,x1,x0,y3,y2,y1,y0) \
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__asm__ ("sub{l} {%11,%3|%3,%11}\n\t" \
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"sbb{l} {%9,%2|%2,%9}\n\t" \
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"sbb{l} {%7,%1|%1,%7}\n\t" \
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"sbb{l} {%5,%0|%0,%5}" \
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: "=r" ((USItype) (r3)), \
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"=&r" ((USItype) (r2)), \
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"=&r" ((USItype) (r1)), \
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"=&r" ((USItype) (r0)) \
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: "0" ((USItype) (x3)), \
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"g" ((USItype) (y3)), \
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"1" ((USItype) (x2)), \
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"g" ((USItype) (y2)), \
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"2" ((USItype) (x1)), \
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"g" ((USItype) (y1)), \
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"3" ((USItype) (x0)), \
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"g" ((USItype) (y0)))
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# define __FP_FRAC_SUB_3(r2,r1,r0,x2,x1,x0,y2,y1,y0) \
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__asm__ ("sub{l} {%8,%2|%2,%8}\n\t" \
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"sbb{l} {%6,%1|%1,%6}\n\t" \
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"sbb{l} {%4,%0|%0,%4}" \
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: "=r" ((USItype) (r2)), \
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"=&r" ((USItype) (r1)), \
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"=&r" ((USItype) (r0)) \
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: "0" ((USItype) (x2)), \
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"g" ((USItype) (y2)), \
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"1" ((USItype) (x1)), \
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"g" ((USItype) (y1)), \
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"2" ((USItype) (x0)), \
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"g" ((USItype) (y0)))
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# define __FP_FRAC_ADDI_4(x3,x2,x1,x0,i) \
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__asm__ ("add{l} {%4,%3|%3,%4}\n\t" \
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"adc{l} {$0,%2|%2,0}\n\t" \
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"adc{l} {$0,%1|%1,0}\n\t" \
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"adc{l} {$0,%0|%0,0}" \
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: "+r" ((USItype) (x3)), \
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"+&r" ((USItype) (x2)), \
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"+&r" ((USItype) (x1)), \
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"+&r" ((USItype) (x0)) \
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: "g" ((USItype) (i)))
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# define _FP_MUL_MEAT_S(R,X,Y) \
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_FP_MUL_MEAT_1_wide(_FP_WFRACBITS_S,R,X,Y,umul_ppmm)
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# define _FP_MUL_MEAT_D(R,X,Y) \
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_FP_MUL_MEAT_2_wide(_FP_WFRACBITS_D,R,X,Y,umul_ppmm)
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# define _FP_MUL_MEAT_Q(R,X,Y) \
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_FP_MUL_MEAT_4_wide(_FP_WFRACBITS_Q,R,X,Y,umul_ppmm)
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# define _FP_DIV_MEAT_S(R,X,Y) _FP_DIV_MEAT_1_loop(S,R,X,Y)
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# define _FP_DIV_MEAT_D(R,X,Y) _FP_DIV_MEAT_2_udiv(D,R,X,Y)
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# define _FP_DIV_MEAT_Q(R,X,Y) _FP_DIV_MEAT_4_udiv(Q,R,X,Y)
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# define _FP_NANFRAC_S _FP_QNANBIT_S
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# define _FP_NANFRAC_D _FP_QNANBIT_D, 0
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/* Even if XFmode is 12byte, we have to pad it to
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16byte since soft-fp emulation is done in 16byte. */
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# define _FP_NANFRAC_E _FP_QNANBIT_E, 0, 0, 0
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# define _FP_NANFRAC_Q _FP_QNANBIT_Q, 0, 0, 0
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# define FP_EX_SHIFT 0
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# define _FP_DECL_EX \
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unsigned short _fcw __attribute__ ((unused)) = FP_RND_NEAREST;
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# define FP_RND_NEAREST 0
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# define FP_RND_ZERO 0xc00
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# define FP_RND_PINF 0x800
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# define FP_RND_MINF 0x400
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# define FP_RND_MASK 0xc00
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# define FP_INIT_ROUNDMODE \
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do { \
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__asm__ __volatile__ ("fnstcw\t%0" : "=m" (_fcw)); \
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} while (0)
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#endif
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#define _FP_KEEPNANFRACP 1
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#define _FP_QNANNEGATEDP 0
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#define _FP_NANSIGN_S 1
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#define _FP_NANSIGN_D 1
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#define _FP_NANSIGN_E 1
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#define _FP_NANSIGN_Q 1
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/* Here is something Intel misdesigned: the specs don't define
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the case where we have two NaNs with same mantissas, but
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different sign. Different operations pick up different NaNs. */
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#define _FP_CHOOSENAN(fs, wc, R, X, Y, OP) \
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do { \
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if (_FP_FRAC_GT_##wc(X, Y) \
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|| (_FP_FRAC_EQ_##wc(X,Y) && (OP == '+' || OP == '*'))) \
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{ \
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R##_s = X##_s; \
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_FP_FRAC_COPY_##wc(R,X); \
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} \
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else \
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{ \
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R##_s = Y##_s; \
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_FP_FRAC_COPY_##wc(R,Y); \
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} \
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R##_c = FP_CLS_NAN; \
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} while (0)
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#define FP_EX_INVALID 0x01
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#define FP_EX_DENORM 0x02
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#define FP_EX_DIVZERO 0x04
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#define FP_EX_OVERFLOW 0x08
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#define FP_EX_UNDERFLOW 0x10
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#define FP_EX_INEXACT 0x20
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#define FP_EX_ALL \
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(FP_EX_INVALID | FP_EX_DENORM | FP_EX_DIVZERO | FP_EX_OVERFLOW \
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| FP_EX_UNDERFLOW | FP_EX_INEXACT)
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void __sfp_handle_exceptions (int);
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#define FP_HANDLE_EXCEPTIONS \
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do { \
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if (__builtin_expect (_fex, 0)) \
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__sfp_handle_exceptions (_fex); \
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} while (0);
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#define FP_TRAPPING_EXCEPTIONS ((~_fcw >> FP_EX_SHIFT) & FP_EX_ALL)
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#define FP_ROUNDMODE (_fcw & FP_RND_MASK)
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#define _FP_TININESS_AFTER_ROUNDING 1
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