forked from Minki/linux
347b0cf022
The following asm statements generated a sparse warning:
asm("addcc \n\t" : "=r" (((USItype)(r2)))
warning: asm output is not an lvalue
When asking on the sparse mailing list Linus replyed:
"
Those casts to (USItype) are all pointless to begin with (since the
values are of that type already!) and they mean that the expression
isn't something you can assign to (lvalue).
"
In the math emulation code drop all casts in the output
parts of the asm statements.
This fixes a lot of "warning: asm output is not an lvalue" sparse
warnings in math_32.c.
Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
213 lines
6.8 KiB
C
213 lines
6.8 KiB
C
/* Machine-dependent software floating-point definitions.
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Sparc userland (_Q_*) version.
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Copyright (C) 1997,1998,1999 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by Richard Henderson (rth@cygnus.com),
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Jakub Jelinek (jj@ultra.linux.cz),
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David S. Miller (davem@redhat.com) and
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Peter Maydell (pmaydell@chiark.greenend.org.uk).
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public License as
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published by the Free Software Foundation; either version 2 of the
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License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with the GNU C Library; see the file COPYING.LIB. If
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not, write to the Free Software Foundation, Inc.,
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59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
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#ifndef _SFP_MACHINE_H
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#define _SFP_MACHINE_H
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#define _FP_W_TYPE_SIZE 32
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#define _FP_W_TYPE unsigned long
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#define _FP_WS_TYPE signed long
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#define _FP_I_TYPE long
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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_udiv(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 << 1) - 1)
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#define _FP_NANFRAC_D ((_FP_QNANBIT_D << 1) - 1), -1
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#define _FP_NANFRAC_Q ((_FP_QNANBIT_Q << 1) - 1), -1, -1, -1
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#define _FP_NANSIGN_S 0
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#define _FP_NANSIGN_D 0
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#define _FP_NANSIGN_Q 0
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#define _FP_KEEPNANFRACP 1
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/* If one NaN is signaling and the other is not,
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* we choose that one, otherwise we choose X.
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*/
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/* For _Qp_* and _Q_*, this should prefer X, for
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* CPU instruction emulation this should prefer Y.
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* (see SPAMv9 B.2.2 section).
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*/
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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_HIGH_RAW_##fs(Y) & _FP_QNANBIT_##fs) \
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&& !(_FP_FRAC_HIGH_RAW_##fs(X) & _FP_QNANBIT_##fs)) \
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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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/* Some assembly to speed things up. */
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#define __FP_FRAC_ADD_3(r2,r1,r0,x2,x1,x0,y2,y1,y0) \
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__asm__ ("addcc %r7,%8,%2\n\t" \
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"addxcc %r5,%6,%1\n\t" \
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"addx %r3,%4,%0\n" \
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: "=r" (r2), \
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"=&r" (r1), \
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"=&r" (r0) \
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: "%rJ" ((USItype)(x2)), \
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"rI" ((USItype)(y2)), \
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"%rJ" ((USItype)(x1)), \
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"rI" ((USItype)(y1)), \
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"%rJ" ((USItype)(x0)), \
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"rI" ((USItype)(y0)) \
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: "cc")
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#define __FP_FRAC_SUB_3(r2,r1,r0,x2,x1,x0,y2,y1,y0) \
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__asm__ ("subcc %r7,%8,%2\n\t" \
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"subxcc %r5,%6,%1\n\t" \
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"subx %r3,%4,%0\n" \
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: "=r" (r2), \
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"=&r" (r1), \
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"=&r" (r0) \
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: "%rJ" ((USItype)(x2)), \
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"rI" ((USItype)(y2)), \
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"%rJ" ((USItype)(x1)), \
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"rI" ((USItype)(y1)), \
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"%rJ" ((USItype)(x0)), \
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"rI" ((USItype)(y0)) \
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: "cc")
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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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do { \
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/* We need to fool gcc, as we need to pass more than 10 \
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input/outputs. */ \
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register USItype _t1 __asm__ ("g1"), _t2 __asm__ ("g2"); \
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__asm__ __volatile__ ( \
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"addcc %r8,%9,%1\n\t" \
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"addxcc %r6,%7,%0\n\t" \
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"addxcc %r4,%5,%%g2\n\t" \
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"addx %r2,%3,%%g1\n\t" \
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: "=&r" (r1), \
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"=&r" (r0) \
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: "%rJ" ((USItype)(x3)), \
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"rI" ((USItype)(y3)), \
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"%rJ" ((USItype)(x2)), \
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"rI" ((USItype)(y2)), \
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"%rJ" ((USItype)(x1)), \
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"rI" ((USItype)(y1)), \
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"%rJ" ((USItype)(x0)), \
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"rI" ((USItype)(y0)) \
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: "cc", "g1", "g2"); \
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__asm__ __volatile__ ("" : "=r" (_t1), "=r" (_t2)); \
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r3 = _t1; r2 = _t2; \
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} while (0)
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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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do { \
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/* We need to fool gcc, as we need to pass more than 10 \
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input/outputs. */ \
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register USItype _t1 __asm__ ("g1"), _t2 __asm__ ("g2"); \
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__asm__ __volatile__ ( \
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"subcc %r8,%9,%1\n\t" \
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"subxcc %r6,%7,%0\n\t" \
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"subxcc %r4,%5,%%g2\n\t" \
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"subx %r2,%3,%%g1\n\t" \
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: "=&r" (r1), \
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"=&r" (r0) \
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: "%rJ" ((USItype)(x3)), \
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"rI" ((USItype)(y3)), \
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"%rJ" ((USItype)(x2)), \
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"rI" ((USItype)(y2)), \
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"%rJ" ((USItype)(x1)), \
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"rI" ((USItype)(y1)), \
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"%rJ" ((USItype)(x0)), \
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"rI" ((USItype)(y0)) \
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: "cc", "g1", "g2"); \
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__asm__ __volatile__ ("" : "=r" (_t1), "=r" (_t2)); \
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r3 = _t1; r2 = _t2; \
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} while (0)
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#define __FP_FRAC_DEC_3(x2,x1,x0,y2,y1,y0) __FP_FRAC_SUB_3(x2,x1,x0,x2,x1,x0,y2,y1,y0)
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#define __FP_FRAC_DEC_4(x3,x2,x1,x0,y3,y2,y1,y0) __FP_FRAC_SUB_4(x3,x2,x1,x0,x3,x2,x1,x0,y3,y2,y1,y0)
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#define __FP_FRAC_ADDI_4(x3,x2,x1,x0,i) \
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__asm__ ("addcc %3,%4,%3\n\t" \
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"addxcc %2,%%g0,%2\n\t" \
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"addxcc %1,%%g0,%1\n\t" \
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"addx %0,%%g0,%0\n\t" \
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: "=&r" (x3), \
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"=&r" (x2), \
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"=&r" (x1), \
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"=&r" (x0) \
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: "rI" ((USItype)(i)), \
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"0" ((USItype)(x3)), \
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"1" ((USItype)(x2)), \
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"2" ((USItype)(x1)), \
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"3" ((USItype)(x0)) \
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: "cc")
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#ifndef CONFIG_SMP
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extern struct task_struct *last_task_used_math;
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#endif
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/* Obtain the current rounding mode. */
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#ifndef FP_ROUNDMODE
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#ifdef CONFIG_SMP
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#define FP_ROUNDMODE ((current->thread.fsr >> 30) & 0x3)
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#else
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#define FP_ROUNDMODE ((last_task_used_math->thread.fsr >> 30) & 0x3)
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#endif
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#endif
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/* Exception flags. */
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#define FP_EX_INVALID (1 << 4)
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#define FP_EX_OVERFLOW (1 << 3)
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#define FP_EX_UNDERFLOW (1 << 2)
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#define FP_EX_DIVZERO (1 << 1)
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#define FP_EX_INEXACT (1 << 0)
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#define FP_HANDLE_EXCEPTIONS return _fex
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#ifdef CONFIG_SMP
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#define FP_INHIBIT_RESULTS ((current->thread.fsr >> 23) & _fex)
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#else
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#define FP_INHIBIT_RESULTS ((last_task_used_math->thread.fsr >> 23) & _fex)
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#endif
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#ifdef CONFIG_SMP
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#define FP_TRAPPING_EXCEPTIONS ((current->thread.fsr >> 23) & 0x1f)
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#else
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#define FP_TRAPPING_EXCEPTIONS ((last_task_used_math->thread.fsr >> 23) & 0x1f)
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#endif
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#endif
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