xref: /src/external/gpl3/gcc/dist/libgcc/config/ia64/lib1funcs.S

/* Copyright (C) 2000-2024 Free Software Foundation, Inc.
   Contributed by James E. Wilson <wilson (at) cygnus.com>.

   This file is part of GCC.

   GCC is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 3, or (at your option)
   any later version.

   GCC is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   Under Section 7 of GPL version 3, you are granted additional
   permissions described in the GCC Runtime Library Exception, version
   3.1, as published by the Free Software Foundation.

   You should have received a copy of the GNU General Public License and
   a copy of the GCC Runtime Library Exception along with this program;
   see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
   <http://www.gnu.org/licenses/>.  */

#ifdef L__divxf3
// Compute a 80-bit IEEE double-extended quotient.
//
// From the Intel IA-64 Optimization Guide, choose the minimum latency
// alternative.
//
// farg0 holds the dividend.  farg1 holds the divisor.
//
// __divtf3 is an alternate symbol name for backward compatibility.

	.text
	.align 16
	.global __divxf3
	.proc __divxf3
__divxf3:
#ifdef SHARED
	.global __divtf3
__divtf3:
#endif
	cmp.eq p7, p0 = r0, r0
	frcpa.s0 f10, p6 = farg0, farg1
	;;
(p6)	cmp.ne p7, p0 = r0, r0
	.pred.rel.mutex p6, p7
(p6)	fnma.s1 f11 = farg1, f10, f1
(p6)	fma.s1 f12 = farg0, f10, f0
	;;
(p6)	fma.s1 f13 = f11, f11, f0
(p6)	fma.s1 f14 = f11, f11, f11
	;;
(p6)	fma.s1 f11 = f13, f13, f11
(p6)	fma.s1 f13 = f14, f10, f10
	;;
(p6)	fma.s1 f10 = f13, f11, f10
(p6)	fnma.s1 f11 = farg1, f12, farg0
	;;
(p6)	fma.s1 f11 = f11, f10, f12
(p6)	fnma.s1 f12 = farg1, f10, f1
	;;
(p6)	fma.s1 f10 = f12, f10, f10
(p6)	fnma.s1 f12 = farg1, f11, farg0
	;;
(p6)	fma.s0 fret0 = f12, f10, f11
(p7)	mov fret0 = f10
	br.ret.sptk rp
	.endp __divxf3
#endif

#ifdef L__divdf3
// Compute a 64-bit IEEE double quotient.
//
// From the Intel IA-64 Optimization Guide, choose the minimum latency
// alternative.
//
// farg0 holds the dividend.  farg1 holds the divisor.

	.text
	.align 16
	.global __divdf3
	.proc __divdf3
__divdf3:
	cmp.eq p7, p0 = r0, r0
	frcpa.s0 f10, p6 = farg0, farg1
	;;
(p6)	cmp.ne p7, p0 = r0, r0
	.pred.rel.mutex p6, p7
(p6)	fmpy.s1 f11 = farg0, f10
(p6)	fnma.s1 f12 = farg1, f10, f1
	;;
(p6)	fma.s1 f11 = f12, f11, f11
(p6)	fmpy.s1 f13 = f12, f12
	;;
(p6)	fma.s1 f10 = f12, f10, f10
(p6)	fma.s1 f11 = f13, f11, f11
	;;
(p6)	fmpy.s1 f12 = f13, f13
(p6)	fma.s1 f10 = f13, f10, f10
	;;
(p6)	fma.d.s1 f11 = f12, f11, f11
(p6)	fma.s1 f10 = f12, f10, f10
	;;
(p6)	fnma.d.s1 f8 = farg1, f11, farg0
	;;
(p6)	fma.d fret0 = f8, f10, f11
(p7)	mov fret0 = f10
	br.ret.sptk rp
	;;
	.endp __divdf3
#endif

#ifdef L__divsf3
// Compute a 32-bit IEEE float quotient.
//
// From the Intel IA-64 Optimization Guide, choose the minimum latency
// alternative.
//
// farg0 holds the dividend.  farg1 holds the divisor.

	.text
	.align 16
	.global __divsf3
	.proc __divsf3
__divsf3:
	cmp.eq p7, p0 = r0, r0
	frcpa.s0 f10, p6 = farg0, farg1
	;;
(p6)	cmp.ne p7, p0 = r0, r0
	.pred.rel.mutex p6, p7
(p6)	fmpy.s1 f8 = farg0, f10
(p6)	fnma.s1 f9 = farg1, f10, f1
	;;
(p6)	fma.s1 f8 = f9, f8, f8
(p6)	fmpy.s1 f9 = f9, f9
	;;
(p6)	fma.s1 f8 = f9, f8, f8
(p6)	fmpy.s1 f9 = f9, f9
	;;
(p6)	fma.d.s1 f10 = f9, f8, f8
	;;
(p6)	fnorm.s.s0 fret0 = f10
(p7)	mov fret0 = f10
	br.ret.sptk rp
	;;
	.endp __divsf3
#endif

#ifdef L__divdi3
// Compute a 64-bit integer quotient.
//
// From the Intel IA-64 Optimization Guide, choose the minimum latency
// alternative.
//
// in0 holds the dividend.  in1 holds the divisor.

	.text
	.align 16
	.global __divdi3
	.proc __divdi3
__divdi3:
	.regstk 2,0,0,0
	// Transfer inputs to FP registers.
	setf.sig f8 = in0
	setf.sig f9 = in1
	// Check divide by zero.
	cmp.ne.unc p0,p7=0,in1
	;;
	// Convert the inputs to FP, so that they won't be treated as unsigned.
	fcvt.xf f8 = f8
	fcvt.xf f9 = f9
(p7)	break 1
	;;
	// Compute the reciprocal approximation.
	frcpa.s1 f10, p6 = f8, f9
	;;
	// 3 Newton-Raphson iterations.
(p6)	fnma.s1 f11 = f9, f10, f1
(p6)	fmpy.s1 f12 = f8, f10
	;;
(p6)	fmpy.s1 f13 = f11, f11
(p6)	fma.s1 f12 = f11, f12, f12
	;;
(p6)	fma.s1 f10 = f11, f10, f10
(p6)	fma.s1 f11 = f13, f12, f12
	;;
(p6)	fma.s1 f10 = f13, f10, f10
(p6)	fnma.s1 f12 = f9, f11, f8
	;;
(p6)	fma.s1 f10 = f12, f10, f11
	;;
	// Round quotient to an integer.
	fcvt.fx.trunc.s1 f10 = f10
	;;
	// Transfer result to GP registers.
	getf.sig ret0 = f10
	br.ret.sptk rp
	;;
	.endp __divdi3
#endif

#ifdef L__moddi3
// Compute a 64-bit integer modulus.
//
// From the Intel IA-64 Optimization Guide, choose the minimum latency
// alternative.
//
// in0 holds the dividend (a).  in1 holds the divisor (b).

	.text
	.align 16
	.global __moddi3
	.proc __moddi3
__moddi3:
	.regstk 2,0,0,0
	// Transfer inputs to FP registers.
	setf.sig f14 = in0
	setf.sig f9 = in1
	// Check divide by zero.
	cmp.ne.unc p0,p7=0,in1
	;;
	// Convert the inputs to FP, so that they won't be treated as unsigned.
	fcvt.xf f8 = f14
	fcvt.xf f9 = f9
(p7)	break 1
	;;
	// Compute the reciprocal approximation.
	frcpa.s1 f10, p6 = f8, f9
	;;
	// 3 Newton-Raphson iterations.
(p6)	fmpy.s1 f12 = f8, f10
(p6)	fnma.s1 f11 = f9, f10, f1
	;;
(p6)	fma.s1 f12 = f11, f12, f12
(p6)	fmpy.s1 f13 = f11, f11
	;;
(p6)	fma.s1 f10 = f11, f10, f10
(p6)	fma.s1 f11 = f13, f12, f12
	;;
	sub in1 = r0, in1
(p6)	fma.s1 f10 = f13, f10, f10
(p6)	fnma.s1 f12 = f9, f11, f8
	;;
	setf.sig f9 = in1
(p6)	fma.s1 f10 = f12, f10, f11
	;;
	fcvt.fx.trunc.s1 f10 = f10
	;;
	// r = q * (-b) + a
	xma.l f10 = f10, f9, f14
	;;
	// Transfer result to GP registers.
	getf.sig ret0 = f10
	br.ret.sptk rp
	;;
	.endp __moddi3
#endif

#ifdef L__udivdi3
// Compute a 64-bit unsigned integer quotient.
//
// From the Intel IA-64 Optimization Guide, choose the minimum latency
// alternative.
//
// in0 holds the dividend.  in1 holds the divisor.

	.text
	.align 16
	.global __udivdi3
	.proc __udivdi3
__udivdi3:
	.regstk 2,0,0,0
	// Transfer inputs to FP registers.
	setf.sig f8 = in0
	setf.sig f9 = in1
	// Check divide by zero.
	cmp.ne.unc p0,p7=0,in1
	;;
	// Convert the inputs to FP, to avoid FP software-assist faults.
	fcvt.xuf.s1 f8 = f8
	fcvt.xuf.s1 f9 = f9
(p7)	break 1
	;;
	// Compute the reciprocal approximation.
	frcpa.s1 f10, p6 = f8, f9
	;;
	// 3 Newton-Raphson iterations.
(p6)	fnma.s1 f11 = f9, f10, f1
(p6)	fmpy.s1 f12 = f8, f10
	;;
(p6)	fmpy.s1 f13 = f11, f11
(p6)	fma.s1 f12 = f11, f12, f12
	;;
(p6)	fma.s1 f10 = f11, f10, f10
(p6)	fma.s1 f11 = f13, f12, f12
	;;
(p6)	fma.s1 f10 = f13, f10, f10
(p6)	fnma.s1 f12 = f9, f11, f8
	;;
(p6)	fma.s1 f10 = f12, f10, f11
	;;
	// Round quotient to an unsigned integer.
	fcvt.fxu.trunc.s1 f10 = f10
	;;
	// Transfer result to GP registers.
	getf.sig ret0 = f10
	br.ret.sptk rp
	;;
	.endp __udivdi3
#endif

#ifdef L__umoddi3
// Compute a 64-bit unsigned integer modulus.
//
// From the Intel IA-64 Optimization Guide, choose the minimum latency
// alternative.
//
// in0 holds the dividend (a).  in1 holds the divisor (b).

	.text
	.align 16
	.global __umoddi3
	.proc __umoddi3
__umoddi3:
	.regstk 2,0,0,0
	// Transfer inputs to FP registers.
	setf.sig f14 = in0
	setf.sig f9 = in1
	// Check divide by zero.
	cmp.ne.unc p0,p7=0,in1
	;;
	// Convert the inputs to FP, to avoid FP software assist faults.
	fcvt.xuf.s1 f8 = f14
	fcvt.xuf.s1 f9 = f9
(p7)	break 1;
	;;
	// Compute the reciprocal approximation.
	frcpa.s1 f10, p6 = f8, f9
	;;
	// 3 Newton-Raphson iterations.
(p6)	fmpy.s1 f12 = f8, f10
(p6)	fnma.s1 f11 = f9, f10, f1
	;;
(p6)	fma.s1 f12 = f11, f12, f12
(p6)	fmpy.s1 f13 = f11, f11
	;;
(p6)	fma.s1 f10 = f11, f10, f10
(p6)	fma.s1 f11 = f13, f12, f12
	;;
	sub in1 = r0, in1
(p6)	fma.s1 f10 = f13, f10, f10
(p6)	fnma.s1 f12 = f9, f11, f8
	;;
	setf.sig f9 = in1
(p6)	fma.s1 f10 = f12, f10, f11
	;;
	// Round quotient to an unsigned integer.
	fcvt.fxu.trunc.s1 f10 = f10
	;;
	// r = q * (-b) + a
	xma.l f10 = f10, f9, f14
	;;
	// Transfer result to GP registers.
	getf.sig ret0 = f10
	br.ret.sptk rp
	;;
	.endp __umoddi3
#endif

#ifdef L__divsi3
// Compute a 32-bit integer quotient.
//
// From the Intel IA-64 Optimization Guide, choose the minimum latency
// alternative.
//
// in0 holds the dividend.  in1 holds the divisor.

	.text
	.align 16
	.global __divsi3
	.proc __divsi3
__divsi3:
	.regstk 2,0,0,0
	// Check divide by zero.
	cmp.ne.unc p0,p7=0,in1
	sxt4 in0 = in0
	sxt4 in1 = in1
	;;
	setf.sig f8 = in0
	setf.sig f9 = in1
(p7)	break 1
	;;
	mov r2 = 0x0ffdd
	fcvt.xf f8 = f8
	fcvt.xf f9 = f9
	;;
	setf.exp f11 = r2
	frcpa.s1 f10, p6 = f8, f9
	;;
(p6)	fmpy.s1 f8 = f8, f10
(p6)	fnma.s1 f9 = f9, f10, f1
	;;
(p6)	fma.s1 f8 = f9, f8, f8
(p6)	fma.s1 f9 = f9, f9, f11
	;;
(p6)	fma.s1 f10 = f9, f8, f8
	;;
	fcvt.fx.trunc.s1 f10 = f10
	;;
	getf.sig ret0 = f10
	br.ret.sptk rp
	;;
	.endp __divsi3
#endif

#ifdef L__modsi3
// Compute a 32-bit integer modulus.
//
// From the Intel IA-64 Optimization Guide, choose the minimum latency
// alternative.
//
// in0 holds the dividend.  in1 holds the divisor.

	.text
	.align 16
	.global __modsi3
	.proc __modsi3
__modsi3:
	.regstk 2,0,0,0
	mov r2 = 0x0ffdd
	sxt4 in0 = in0
	sxt4 in1 = in1
	;;
	setf.sig f13 = r32
	setf.sig f9 = r33
	// Check divide by zero.
	cmp.ne.unc p0,p7=0,in1
	;;
	sub in1 = r0, in1
	fcvt.xf f8 = f13
	fcvt.xf f9 = f9
	;;
	setf.exp f11 = r2
	frcpa.s1 f10, p6 = f8, f9
(p7)	break 1
	;;
(p6)	fmpy.s1 f12 = f8, f10
(p6)	fnma.s1 f10 = f9, f10, f1
	;;
	setf.sig f9 = in1
(p6)	fma.s1 f12 = f10, f12, f12
(p6)	fma.s1 f10 = f10, f10, f11
	;;
(p6)	fma.s1 f10 = f10, f12, f12
	;;
	fcvt.fx.trunc.s1 f10 = f10
	;;
	xma.l f10 = f10, f9, f13
	;;
	getf.sig ret0 = f10
	br.ret.sptk rp
	;;
	.endp __modsi3
#endif

#ifdef L__udivsi3
// Compute a 32-bit unsigned integer quotient.
//
// From the Intel IA-64 Optimization Guide, choose the minimum latency
// alternative.
//
// in0 holds the dividend.  in1 holds the divisor.

	.text
	.align 16
	.global __udivsi3
	.proc __udivsi3
__udivsi3:
	.regstk 2,0,0,0
	mov r2 = 0x0ffdd
	zxt4 in0 = in0
	zxt4 in1 = in1
	;;
	setf.sig f8 = in0
	setf.sig f9 = in1
	// Check divide by zero.
	cmp.ne.unc p0,p7=0,in1
	;;
	fcvt.xf f8 = f8
	fcvt.xf f9 = f9
(p7)	break 1
	;;
	setf.exp f11 = r2
	frcpa.s1 f10, p6 = f8, f9
	;;
(p6)	fmpy.s1 f8 = f8, f10
(p6)	fnma.s1 f9 = f9, f10, f1
	;;
(p6)	fma.s1 f8 = f9, f8, f8
(p6)	fma.s1 f9 = f9, f9, f11
	;;
(p6)	fma.s1 f10 = f9, f8, f8
	;;
	fcvt.fxu.trunc.s1 f10 = f10
	;;
	getf.sig ret0 = f10
	br.ret.sptk rp
	;;
	.endp __udivsi3
#endif

#ifdef L__umodsi3
// Compute a 32-bit unsigned integer modulus.
//
// From the Intel IA-64 Optimization Guide, choose the minimum latency
// alternative.
//
// in0 holds the dividend.  in1 holds the divisor.

	.text
	.align 16
	.global __umodsi3
	.proc __umodsi3
__umodsi3:
	.regstk 2,0,0,0
	mov r2 = 0x0ffdd
	zxt4 in0 = in0
	zxt4 in1 = in1
	;;
	setf.sig f13 = in0
	setf.sig f9 = in1
	// Check divide by zero.
	cmp.ne.unc p0,p7=0,in1
	;;
	sub in1 = r0, in1
	fcvt.xf f8 = f13
	fcvt.xf f9 = f9
	;;
	setf.exp f11 = r2
	frcpa.s1 f10, p6 = f8, f9
(p7)	break 1;
	;;
(p6)	fmpy.s1 f12 = f8, f10
(p6)	fnma.s1 f10 = f9, f10, f1
	;;
	setf.sig f9 = in1
(p6)	fma.s1 f12 = f10, f12, f12
(p6)	fma.s1 f10 = f10, f10, f11
	;;
(p6)	fma.s1 f10 = f10, f12, f12
	;;
	fcvt.fxu.trunc.s1 f10 = f10
	;;
	xma.l f10 = f10, f9, f13
	;;
	getf.sig ret0 = f10
	br.ret.sptk rp
	;;
	.endp __umodsi3
#endif

#ifdef L__save_stack_nonlocal
// Notes on save/restore stack nonlocal: We read ar.bsp but write
// ar.bspstore.  This is because ar.bsp can be read at all times
// (independent of the RSE mode) but since it's read-only we need to
// restore the value via ar.bspstore.  This is OK because
// ar.bsp==ar.bspstore after executing "flushrs".

// void __ia64_save_stack_nonlocal(void *save_area, void *stack_pointer)

	.text
	.align 16
	.global __ia64_save_stack_nonlocal
	.proc __ia64_save_stack_nonlocal
__ia64_save_stack_nonlocal:
	{ .mmf
	  alloc r18 = ar.pfs, 2, 0, 0, 0
	  mov r19 = ar.rsc
	  ;;
	}
	{ .mmi
	  flushrs
	  st8 [in0] = in1, 24
	  and r19 = 0x1c, r19
	  ;;
	}
	{ .mmi
	  st8 [in0] = r18, -16
	  mov ar.rsc = r19
	  or r19 = 0x3, r19
	  ;;
	}
	{ .mmi
	  mov r16 = ar.bsp
	  mov r17 = ar.rnat
	  adds r2 = 8, in0
	  ;;
	}
	{ .mmi
	  st8 [in0] = r16
	  st8 [r2] = r17
	}
	{ .mib
	  mov ar.rsc = r19
	  br.ret.sptk.few rp
	  ;;
	}
	.endp __ia64_save_stack_nonlocal
#endif

#ifdef L__nonlocal_goto
// void __ia64_nonlocal_goto(void *target_label, void *save_area,
//			     void *static_chain);

	.text
	.align 16
	.global __ia64_nonlocal_goto
	.proc __ia64_nonlocal_goto
__ia64_nonlocal_goto:
	{ .mmi
	  alloc r20 = ar.pfs, 3, 0, 0, 0
	  ld8 r12 = [in1], 8
	  mov.ret.sptk rp = in0, .L0
	  ;;
	}
	{ .mmf
	  ld8 r16 = [in1], 8
	  mov r19 = ar.rsc
	  ;;
	}
	{ .mmi
	  flushrs
	  ld8 r17 = [in1], 8
	  and r19 = 0x1c, r19
	  ;;
	}
	{ .mmi
	  ld8 r18 = [in1]
	  mov ar.rsc = r19
	  or r19 = 0x3, r19
	  ;;
	}
	{ .mmi
	  mov ar.bspstore = r16
	  ;;
	  mov ar.rnat = r17
	  ;;
	}
	{ .mmi
	  loadrs
	  invala
	  mov r15 = in2
	  ;;
	}
.L0:	{ .mib
	  mov ar.rsc = r19
	  mov ar.pfs = r18
	  br.ret.sptk.few rp
	  ;;
	}
	.endp __ia64_nonlocal_goto
#endif

#ifdef L__restore_stack_nonlocal
// This is mostly the same as nonlocal_goto above.
// ??? This has not been tested yet.

// void __ia64_restore_stack_nonlocal(void *save_area)

	.text
	.align 16
	.global __ia64_restore_stack_nonlocal
	.proc __ia64_restore_stack_nonlocal
__ia64_restore_stack_nonlocal:
	{ .mmf
	  alloc r20 = ar.pfs, 4, 0, 0, 0
	  ld8 r12 = [in0], 8
	  ;;
	}
	{ .mmb
	  ld8 r16=[in0], 8
	  mov r19 = ar.rsc
	  ;;
	}
	{ .mmi
	  flushrs
	  ld8 r17 = [in0], 8
	  and r19 = 0x1c, r19
	  ;;
	}
	{ .mmf
	  ld8 r18 = [in0]
	  mov ar.rsc = r19
	  ;;
	}
	{ .mmi
	  mov ar.bspstore = r16
	  ;;
	  mov ar.rnat = r17
	  or r19 = 0x3, r19
	  ;;
	}
	{ .mmf
	  loadrs
	  invala
	  ;;
	}
.L0:	{ .mib
	  mov ar.rsc = r19
	  mov ar.pfs = r18
	  br.ret.sptk.few rp
	  ;;
	}
	.endp __ia64_restore_stack_nonlocal
#endif

#ifdef L__trampoline
// Implement the nested function trampoline.  This is out of line
// so that we don't have to bother with flushing the icache, as
// well as making the on-stack trampoline smaller.
//
// The trampoline has the following form:
//
//		+-------------------+ >
//	TRAMP:	| __ia64_trampoline | |
//		+-------------------+  > fake function descriptor
//		| TRAMP+16          | |
//		+-------------------+ >
//		| target descriptor |
//		+-------------------+
//		| static link	    |
//		+-------------------+

	.text
	.align 16
	.global __ia64_trampoline
	.proc __ia64_trampoline
__ia64_trampoline:
	{ .mmi
	  ld8 r2 = [r1], 8
	  ;;
	  ld8 r15 = [r1]
	}
	{ .mmi
	  ld8 r3 = [r2], 8
	  ;;
	  ld8 r1 = [r2]
	  mov b6 = r3
	}
	{ .bbb
	  br.sptk.many b6
	  ;;
	}
	.endp __ia64_trampoline
#endif

#ifdef SHARED
// Thunks for backward compatibility.
#ifdef L_fixtfdi
	.text
	.align 16
	.global __fixtfti
	.proc __fixtfti
__fixtfti:
	{ .bbb
	  br.sptk.many __fixxfti
	  ;;
	}
	.endp __fixtfti
#endif
#ifdef L_fixunstfdi
	.align 16
	.global __fixunstfti
	.proc __fixunstfti
__fixunstfti:
	{ .bbb
	  br.sptk.many __fixunsxfti
	  ;;
	}
	.endp __fixunstfti
#endif
#ifdef L_floatditf
	.align 16
	.global __floattitf
	.proc __floattitf
__floattitf:
	{ .bbb
	  br.sptk.many __floattixf
	  ;;
	}
	.endp __floattitf
#endif
#endif