[Bug math/33576] New: Don't direct inlined math functions

[hjl.tools at gmail dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=33576

            Bug ID: 33576
           Summary: Don't direct inlined math functions
           Product: glibc
           Version: 2.43
            Status: NEW
          Severity: normal
          Priority: P2
         Component: math
          Assignee: unassigned at sourceware dot org
          Reporter: hjl.tools at gmail dot com
                CC: adhemerval.zanella at linaro dot org
  Target Milestone: ---

When a math function should be inlined, we shouldn't redirect it with:

float (rintf) (float) asm ("__" "rint" "f");

Instead

1. Include <math-use-builtins.h> in include/libc-symbols.h.
2. Change math-use-builtins-xxx.h to define

#define USE_xxx_BUILTIN xxx

if xxx should be inlined and define

#define USE_xxx_BUILTIN no_xxx_builtin

if xxx won't be inlined.

3. Change MATH_REDIRECT to something like

#   define MATH_REDIRECT(FUNC, PREFIX, ARGS)                    \
  float (USE_ ## FUNC ## f ## _BUILTIN) (ARGS) asm (PREFIX #FUNC "f"); \
  double (USE_ ## FUNC ## _BUILTIN) (ARGS (double)) asm (PREFIX #FUNC );

MATH_REDIRECT_LDBL and MATH_REDIRECT_F128 should be modified similarly.

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