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When we want to inline builtin math functions, like truncf, for
extern float truncf (float __x) __attribute__ ((__nothrow__ )) __attribute__ ((__const__));
extern float __truncf (float __x) __attribute__ ((__nothrow__ )) __attribute__ ((__const__));
float (truncf) (float) asm ("__truncf");
compiler may redirect truncf calls to __truncf, instead of inlining it
(for instance, clang). The USE_TRUNCF_BUILTIN is 1 to indicate that
truncf should be inlined. In this case, we don't want the truncf
redirection:
1. For each math function which may be inlined, we define
#if USE_TRUNCF_BUILTIN
# define NO_truncf_BUILTIN inline_truncf
#else
# define NO_truncf_BUILTIN truncf
#endif
in <math-use-builtins.h>.
2. Include <math-use-builtins.h> in include/math.h.
3. Change MATH_REDIRECT to
#define MATH_REDIRECT(FUNC, PREFIX, ARGS) \
float (NO_ ## FUNC ## f ## _BUILTIN) (ARGS (float)) \
asm (PREFIX #FUNC "f");
With this change If USE_TRUNCF_BUILTIN is 0, we get
float (truncf) (float) asm ("__truncf");
truncf will be redirected to __truncf.
And for USE_TRUNCF_BUILTIN 1, we get:
float (inline_truncf) (float) asm ("__truncf");
In both cases either truncf will be inlined or the internal alias
(__truncf) will be called.
It is not required for all math-use-builtin symbol, only the one
defined in math.h. It also allows to remove all the math-use-builtin
inclusion, since it is now implicitly included by math.h.
For MIPS, some math-use-builtin headers include sysdep.h and this
in turn includes a lot of extra headers that do not allow ldbl-128
code to override alias definition (math.h will include
some stdlib.h definition). The math-use-builtin only requires
the __mips_isa_rev, so move the defintion to sgidefs.h.
Signed-off-by: H.J. Lu <hjl.tools@gmail.com>
Co-authored-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
Reviewed-by: H.J. Lu <hjl.tools@gmail.com>
83 lines
2.1 KiB
C
83 lines
2.1 KiB
C
/* Copyright (C) 1992-2025 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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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 Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the 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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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library. If not, see
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<https://www.gnu.org/licenses/>. */
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#include <isarev.h>
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#include <sgidefs.h>
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#include <sysdeps/unix/sysdep.h>
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#ifdef __ASSEMBLER__
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#include <regdef.h>
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#define ENTRY(name) \
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.globl name; \
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.align 2; \
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.ent name,0; \
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name##: \
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cfi_startproc;
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#undef END
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#define END(function) \
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cfi_endproc; \
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.end function; \
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.size function,.-function
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#define ret j ra ; nop
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#undef PSEUDO_END
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#define PSEUDO_END(sym) cfi_endproc; .end sym; .size sym,.-sym
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#define PSEUDO_NOERRNO(name, syscall_name, args) \
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.align 2; \
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ENTRY(name) \
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.set nomips16; \
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.set noreorder; \
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li v0, SYS_ify(syscall_name); \
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syscall
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#undef PSEUDO_END_NOERRNO
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#define PSEUDO_END_NOERRNO(sym) cfi_endproc; .end sym; .size sym,.-sym
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#define ret_NOERRNO ret
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#define PSEUDO_ERRVAL(name, syscall_name, args) \
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.align 2; \
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ENTRY(name) \
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.set nomips16; \
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.set noreorder; \
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li v0, SYS_ify(syscall_name); \
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syscall
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#undef PSEUDO_END_ERRVAL
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#define PSEUDO_END_ERRVAL(sym) cfi_endproc; .end sym; .size sym,.-sym
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#define ret_ERRVAL ret
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#define r0 v0
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#define r1 v1
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/* The mips move insn is d,s. */
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#define MOVE(x,y) move y , x
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#if _MIPS_SIM == _ABIO32
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# define L(label) $L ## label
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#else
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# define L(label) .L ## label
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#endif
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#endif
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