mirror of git://sourceware.org/git/glibc.git
13cfd77bf5
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>
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| .. | ||
| bits | ||
| fpu | ||
| ieee754 | ||
| include/sys | ||
| mips32 | ||
| mips64 | ||
| nofpu | ||
| nptl | ||
| sys | ||
| Implies | ||
| Makefile | ||
| __longjmp.c | ||
| abort-instr.h | ||
| add_n.S | ||
| addmul_1.S | ||
| bsd-_setjmp.S | ||
| bsd-setjmp.S | ||
| configure | ||
| configure.ac | ||
| dl-debug.h | ||
| dl-dtprocnum.h | ||
| dl-machine-reject-phdr.h | ||
| dl-machine-rel.h | ||
| dl-machine.h | ||
| dl-r_debug.h | ||
| dl-relocate-ld.h | ||
| dl-tls.h | ||
| dl-trampoline.c | ||
| elf-initfini.h | ||
| elf_machine_sym_no_match.h | ||
| fpregdef.h | ||
| fpu_control.h | ||
| gccframe.h | ||
| isarev.h | ||
| jmpbuf-unwind.h | ||
| ldbl-classify-compat.h | ||
| ldsodefs.h | ||
| libc-tls.c | ||
| linkmap.h | ||
| localplt.data | ||
| lshift.S | ||
| machine-gmon.h | ||
| math-tests-snan-payload.h | ||
| math-use-builtins-ffs.h | ||
| memcpy.S | ||
| memset.S | ||
| mul_1.S | ||
| nan-high-order-bit.h | ||
| preconfigure | ||
| preconfigure.ac | ||
| regdef.h | ||
| rshift.S | ||
| setjmp.S | ||
| setjmp_aux.c | ||
| sgidefs.h | ||
| sotruss-lib.c | ||
| stackinfo.h | ||
| start.S | ||
| sub_n.S | ||
| submul_1.S | ||
| tininess.h | ||
| tst-abi-fp32mod.c | ||
| tst-abi-fp64amod.c | ||
| tst-abi-fp64mod.c | ||
| tst-abi-fpxxmod.c | ||
| tst-abi-fpxxomod.c | ||
| tst-abi-interlink.c | ||
| tst-audit.h | ||
| tst-mode-switch-1.c | ||
| tst-mode-switch-2.c | ||
| tst-mode-switch-3.c | ||
| tst-undefined-weak-lib.S | ||
| tst-undefined-weak.c | ||
| unwind-arch.h | ||
| utmp-size.h | ||