Use __builtin_tgmath in tgmath.h with GCC 8 (bug 21660).
GCC mainline now supports __builtin_tgmath to allow <tgmath.h> macro implementations that expand their arguments only once, so avoiding exponential blowup in the size of macro expansions when calls to those macros are nested in arguments to those macros. This patch makes glibc's tgmath.h support using __builtin_tgmath, as a much simpler and more efficient alternative to the existing implementation. (As a side effect, the new feature would make it much more practical to support decimal floating point in <tgmath.h> with new compilers; currently, libdfp does not provide a <tgmath.h> implementation, and making decimal arguments cause integer arguments to be considered of type _Decimal64 instead of double would have been very problematic in the old implementation.) Tested for x86_64 (with GCC mainline). [BZ #21660] * math/tgmath.h (__HAVE_BUILTIN_TGMATH): New macro. [__HAVE_BUILTIN_TGMATH] (__TG_F16_ARG): Likewise. [__HAVE_BUILTIN_TGMATH] (__TG_F32_ARG): Likewise. [__HAVE_BUILTIN_TGMATH] (__TG_F64_ARG): Likewise. [__HAVE_BUILTIN_TGMATH] (__TG_F128_ARG): Likewise. [__HAVE_BUILTIN_TGMATH] (__TG_F32X_ARG): Likewise. [__HAVE_BUILTIN_TGMATH] (__TG_F64X_ARG): Likewise. [__HAVE_BUILTIN_TGMATH] (__TG_F128X_ARG): Likewise. [__HAVE_BUILTIN_TGMATH] (__TGMATH_FUNCS): Likewise. [__HAVE_BUILTIN_TGMATH] (__TGMATH_RCFUNCS): Likewise. [__HAVE_BUILTIN_TGMATH] (__TGMATH_1): Likewise. [__HAVE_BUILTIN_TGMATH] (__TGMATH_2): Likewise. [__HAVE_BUILTIN_TGMATH] (__TGMATH_2STD): Likewise. [__HAVE_BUILTIN_TGMATH] (__TGMATH_3): Likewise. [__HAVE_BUILTIN_TGMATH] (__TGMATH_1C): Likewise. [__HAVE_BUILTIN_TGMATH] (__TGMATH_2C): Likewise. (__tgml): Make conditional on [!__HAVE_BUILTIN_TGMATH]. (__floating_type): Likewise. (__real_integer_type): Likewise. (__complex_integer_type): Likewise. (__expr_is_real): Likewise. (__tgmath_real_type_sub): Likewise. (__tgmath_real_type): Likewise. (__tgmath_complex_type_sub): Likewise. (__tgmath_complex_type): Likewise. (__TGMATH_F128): Likewise. (__TGMATH_CF128): Likewise. [__HAVE_BUILTIN_TGMATH] (__TGMATH_UNARY_REAL_ONLY): Define using new macros. [__HAVE_BUILTIN_TGMATH] (__TGMATH_UNARY_REAL_RET_ONLY): Likewise. [__HAVE_BUILTIN_TGMATH] (__TGMATH_BINARY_FIRST_REAL_ONLY): Likewise. [__HAVE_BUILTIN_TGMATH] (__TGMATH_BINARY_FIRST_REAL_STD_ONLY): Likewise. [__HAVE_BUILTIN_TGMATH] (__TGMATH_BINARY_REAL_ONLY): Likewise. [__HAVE_BUILTIN_TGMATH] (__TGMATH_BINARY_REAL_STD_ONLY): Likewise. [__HAVE_BUILTIN_TGMATH] (__TGMATH_BINARY_REAL_RET_ONLY): Likewise. [__HAVE_BUILTIN_TGMATH] (__TGMATH_TERNARY_FIRST_SECOND_REAL_ONLY): Likewise. [__HAVE_BUILTIN_TGMATH] (__TGMATH_TERNARY_REAL_ONLY): Likewise. [__HAVE_BUILTIN_TGMATH] (__TGMATH_TERNARY_FIRST_REAL_RET_ONLY): Likewise. [__HAVE_BUILTIN_TGMATH] (__TGMATH_UNARY_REAL_IMAG): Likewise. [__HAVE_BUILTIN_TGMATH] (__TGMATH_UNARY_IMAG): Likewise. [__HAVE_BUILTIN_TGMATH] (__TGMATH_UNARY_REAL_IMAG_RET_REAL): Likewise. [__HAVE_BUILTIN_TGMATH] (__TGMATH_BINARY_REAL_IMAG): Likewise. (__TGMATH_UNARY_REAL_IMAG_RET_REAL_SAME): New macro. (carg): Use __TGMATH_UNARY_REAL_IMAG_RET_REAL_SAME. (cimag): Likewise. (creal): Likewise.
This commit is contained in:
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ChangeLog
55
ChangeLog
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@ -1,3 +1,58 @@
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2017-11-15 Joseph Myers <joseph@codesourcery.com>
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[BZ #21660]
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* math/tgmath.h (__HAVE_BUILTIN_TGMATH): New macro.
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[__HAVE_BUILTIN_TGMATH] (__TG_F16_ARG): Likewise.
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[__HAVE_BUILTIN_TGMATH] (__TG_F32_ARG): Likewise.
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[__HAVE_BUILTIN_TGMATH] (__TG_F64_ARG): Likewise.
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[__HAVE_BUILTIN_TGMATH] (__TG_F128_ARG): Likewise.
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[__HAVE_BUILTIN_TGMATH] (__TG_F32X_ARG): Likewise.
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[__HAVE_BUILTIN_TGMATH] (__TG_F64X_ARG): Likewise.
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[__HAVE_BUILTIN_TGMATH] (__TG_F128X_ARG): Likewise.
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[__HAVE_BUILTIN_TGMATH] (__TGMATH_FUNCS): Likewise.
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[__HAVE_BUILTIN_TGMATH] (__TGMATH_RCFUNCS): Likewise.
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[__HAVE_BUILTIN_TGMATH] (__TGMATH_1): Likewise.
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[__HAVE_BUILTIN_TGMATH] (__TGMATH_2): Likewise.
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[__HAVE_BUILTIN_TGMATH] (__TGMATH_2STD): Likewise.
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[__HAVE_BUILTIN_TGMATH] (__TGMATH_3): Likewise.
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[__HAVE_BUILTIN_TGMATH] (__TGMATH_1C): Likewise.
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[__HAVE_BUILTIN_TGMATH] (__TGMATH_2C): Likewise.
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(__tgml): Make conditional on [!__HAVE_BUILTIN_TGMATH].
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(__floating_type): Likewise.
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(__real_integer_type): Likewise.
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(__complex_integer_type): Likewise.
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(__expr_is_real): Likewise.
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(__tgmath_real_type_sub): Likewise.
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(__tgmath_real_type): Likewise.
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(__tgmath_complex_type_sub): Likewise.
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(__tgmath_complex_type): Likewise.
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(__TGMATH_F128): Likewise.
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(__TGMATH_CF128): Likewise.
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[__HAVE_BUILTIN_TGMATH] (__TGMATH_UNARY_REAL_ONLY): Define using
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new macros.
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[__HAVE_BUILTIN_TGMATH] (__TGMATH_UNARY_REAL_RET_ONLY): Likewise.
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[__HAVE_BUILTIN_TGMATH] (__TGMATH_BINARY_FIRST_REAL_ONLY):
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Likewise.
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[__HAVE_BUILTIN_TGMATH] (__TGMATH_BINARY_FIRST_REAL_STD_ONLY):
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Likewise.
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[__HAVE_BUILTIN_TGMATH] (__TGMATH_BINARY_REAL_ONLY): Likewise.
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[__HAVE_BUILTIN_TGMATH] (__TGMATH_BINARY_REAL_STD_ONLY): Likewise.
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[__HAVE_BUILTIN_TGMATH] (__TGMATH_BINARY_REAL_RET_ONLY): Likewise.
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[__HAVE_BUILTIN_TGMATH] (__TGMATH_TERNARY_FIRST_SECOND_REAL_ONLY):
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Likewise.
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[__HAVE_BUILTIN_TGMATH] (__TGMATH_TERNARY_REAL_ONLY): Likewise.
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[__HAVE_BUILTIN_TGMATH] (__TGMATH_TERNARY_FIRST_REAL_RET_ONLY):
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Likewise.
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[__HAVE_BUILTIN_TGMATH] (__TGMATH_UNARY_REAL_IMAG): Likewise.
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[__HAVE_BUILTIN_TGMATH] (__TGMATH_UNARY_IMAG): Likewise.
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[__HAVE_BUILTIN_TGMATH] (__TGMATH_UNARY_REAL_IMAG_RET_REAL):
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Likewise.
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[__HAVE_BUILTIN_TGMATH] (__TGMATH_BINARY_REAL_IMAG): Likewise.
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(__TGMATH_UNARY_REAL_IMAG_RET_REAL_SAME): New macro.
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(carg): Use __TGMATH_UNARY_REAL_IMAG_RET_REAL_SAME.
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(cimag): Likewise.
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(creal): Likewise.
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2017-11-14 Joseph Myers <joseph@codesourcery.com>
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* string/tester.c (test_stpncpy): Disable -Wstringop-truncation
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112
math/tgmath.h
112
math/tgmath.h
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#include <complex.h>
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/* Since `complex' is currently not really implemented in most C compilers
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and if it is implemented, the implementations differ. This makes it
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quite difficult to write a generic implementation of this header. We
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do not try this for now and instead concentrate only on GNU CC. Once
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we have more information support for other compilers might follow. */
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/* There are two variant implementations of type-generic macros in
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this file: one for GCC 8 and later, using __builtin_tgmath and
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where each macro expands each of its arguments only once, and one
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for older GCC, using other compiler extensions but with macros
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expanding their arguments many times (so resulting in exponential
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blowup of the size of expansions when calls to such macros are
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nested inside arguments to such macros). */
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#define __HAVE_BUILTIN_TGMATH __GNUC_PREREQ (8, 0)
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#if __GNUC_PREREQ (2, 7)
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# if __HAVE_BUILTIN_TGMATH
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# if __HAVE_FLOAT16 && __GLIBC_USE (IEC_60559_TYPES_EXT)
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# define __TG_F16_ARG(X) X ## f16,
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# else
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# define __TG_F16_ARG(X)
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# endif
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# if __HAVE_FLOAT32 && __GLIBC_USE (IEC_60559_TYPES_EXT)
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# define __TG_F32_ARG(X) X ## f32,
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# else
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# define __TG_F32_ARG(X)
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# endif
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# if __HAVE_FLOAT64 && __GLIBC_USE (IEC_60559_TYPES_EXT)
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# define __TG_F64_ARG(X) X ## f64,
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# else
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# define __TG_F64_ARG(X)
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# endif
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# if __HAVE_FLOAT128 && __GLIBC_USE (IEC_60559_TYPES_EXT)
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# define __TG_F128_ARG(X) X ## f128,
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# else
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# define __TG_F128_ARG(X)
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# endif
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# if __HAVE_FLOAT32X && __GLIBC_USE (IEC_60559_TYPES_EXT)
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# define __TG_F32X_ARG(X) X ## f32x,
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# else
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# define __TG_F32X_ARG(X)
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# endif
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# if __HAVE_FLOAT64X && __GLIBC_USE (IEC_60559_TYPES_EXT)
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# define __TG_F64X_ARG(X) X ## f64x,
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# else
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# define __TG_F64X_ARG(X)
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# endif
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# if __HAVE_FLOAT128X && __GLIBC_USE (IEC_60559_TYPES_EXT)
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# define __TG_F128X_ARG(X) X ## f128x,
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# else
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# define __TG_F128X_ARG(X)
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# endif
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# define __TGMATH_FUNCS(X) X ## f, X, X ## l, \
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__TG_F16_ARG (X) __TG_F32_ARG (X) __TG_F64_ARG (X) __TG_F128_ARG (X) \
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__TG_F32X_ARG (X) __TG_F64X_ARG (X) __TG_F128X_ARG (X)
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# define __TGMATH_RCFUNCS(F, C) __TGMATH_FUNCS (F) __TGMATH_FUNCS (C)
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# define __TGMATH_1(F, X) __builtin_tgmath (__TGMATH_FUNCS (F) (X))
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# define __TGMATH_2(F, X, Y) __builtin_tgmath (__TGMATH_FUNCS (F) (X), (Y))
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# define __TGMATH_2STD(F, X, Y) __builtin_tgmath (F ## f, F, F ## l, (X), (Y))
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# define __TGMATH_3(F, X, Y, Z) __builtin_tgmath (__TGMATH_FUNCS (F) \
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(X), (Y), (Z))
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# define __TGMATH_1C(F, C, X) __builtin_tgmath (__TGMATH_RCFUNCS (F, C) (X))
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# define __TGMATH_2C(F, C, X, Y) __builtin_tgmath (__TGMATH_RCFUNCS (F, C) \
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(X), (Y))
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# else /* !__HAVE_BUILTIN_TGMATH. */
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# ifdef __NO_LONG_DOUBLE_MATH
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# define __tgml(fct) fct
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# else
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# define __tgml(fct) fct ## l
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# endif
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/* This is ugly but unless gcc gets appropriate builtins we have to do
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something like this. Don't ask how it works. */
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/* __floating_type expands to 1 if TYPE is a floating type (including
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complex floating types), 0 if TYPE is an integer type (including
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complex integer types). __real_integer_type expands to 1 if TYPE
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# define __TGMATH_CF128(arg_comb, fct, cfct, arg_call) /* Nothing. */
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# endif
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# endif /* !__HAVE_BUILTIN_TGMATH. */
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/* We have two kinds of generic macros: to support functions which are
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only defined on real valued parameters and those which are defined
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for complex functions as well. */
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# if __HAVE_BUILTIN_TGMATH
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# define __TGMATH_UNARY_REAL_ONLY(Val, Fct) __TGMATH_1 (Fct, (Val))
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# define __TGMATH_UNARY_REAL_RET_ONLY(Val, Fct) __TGMATH_1 (Fct, (Val))
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# define __TGMATH_BINARY_FIRST_REAL_ONLY(Val1, Val2, Fct) \
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__TGMATH_2 (Fct, (Val1), (Val2))
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# define __TGMATH_BINARY_FIRST_REAL_STD_ONLY(Val1, Val2, Fct) \
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__TGMATH_2STD (Fct, (Val1), (Val2))
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# define __TGMATH_BINARY_REAL_ONLY(Val1, Val2, Fct) \
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__TGMATH_2 (Fct, (Val1), (Val2))
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# define __TGMATH_BINARY_REAL_STD_ONLY(Val1, Val2, Fct) \
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__TGMATH_2STD (Fct, (Val1), (Val2))
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# define __TGMATH_BINARY_REAL_RET_ONLY(Val1, Val2, Fct) \
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__TGMATH_2 (Fct, (Val1), (Val2))
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# define __TGMATH_TERNARY_FIRST_SECOND_REAL_ONLY(Val1, Val2, Val3, Fct) \
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__TGMATH_3 (Fct, (Val1), (Val2), (Val3))
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# define __TGMATH_TERNARY_REAL_ONLY(Val1, Val2, Val3, Fct) \
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__TGMATH_3 (Fct, (Val1), (Val2), (Val3))
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# define __TGMATH_TERNARY_FIRST_REAL_RET_ONLY(Val1, Val2, Val3, Fct) \
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__TGMATH_3 (Fct, (Val1), (Val2), (Val3))
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# define __TGMATH_UNARY_REAL_IMAG(Val, Fct, Cfct) \
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__TGMATH_1C (Fct, Cfct, (Val))
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# define __TGMATH_UNARY_IMAG(Val, Cfct) __TGMATH_1 (Cfct, (Val))
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# define __TGMATH_UNARY_REAL_IMAG_RET_REAL(Val, Fct, Cfct) \
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__TGMATH_1C (Fct, Cfct, (Val))
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# define __TGMATH_UNARY_REAL_IMAG_RET_REAL_SAME(Val, Cfct) \
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__TGMATH_1 (Cfct, (Val))
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# define __TGMATH_BINARY_REAL_IMAG(Val1, Val2, Fct, Cfct) \
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__TGMATH_2C (Fct, Cfct, (Val1), (Val2))
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# else /* !__HAVE_BUILTIN_TGMATH. */
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# define __TGMATH_UNARY_REAL_ONLY(Val, Fct) \
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(__extension__ ((sizeof (+(Val)) == sizeof (double) \
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|| __builtin_classify_type (Val) != 8) \
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__tgml(Fct) (Val) \
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: (__typeof__ (__real__ (__tgmath_real_type (Val)) 0)) \
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__tgml(Cfct) (Val))))
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# define __TGMATH_UNARY_REAL_IMAG_RET_REAL_SAME(Val, Cfct) \
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__TGMATH_UNARY_REAL_IMAG_RET_REAL ((Val), Cfct, Cfct)
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/* XXX This definition has to be changed as soon as the compiler understands
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the imaginary keyword. */
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: (__typeof ((__tgmath_complex_type (Val1)) 0 \
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+ (__tgmath_complex_type (Val2)) 0)) \
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Cfct##f (Val1, Val2))))
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# endif /* !__HAVE_BUILTIN_TGMATH. */
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#else
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# error "Unsupported compiler; you cannot use <tgmath.h>"
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#endif
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/* Absolute value, conjugates, and projection. */
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/* Argument value of Z. */
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#define carg(Val) __TGMATH_UNARY_REAL_IMAG_RET_REAL (Val, carg, carg)
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#define carg(Val) __TGMATH_UNARY_REAL_IMAG_RET_REAL_SAME (Val, carg)
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/* Complex conjugate of Z. */
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#define conj(Val) __TGMATH_UNARY_IMAG (Val, conj)
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/* Decomposing complex values. */
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/* Imaginary part of Z. */
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#define cimag(Val) __TGMATH_UNARY_REAL_IMAG_RET_REAL (Val, cimag, cimag)
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#define cimag(Val) __TGMATH_UNARY_REAL_IMAG_RET_REAL_SAME (Val, cimag)
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/* Real part of Z. */
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#define creal(Val) __TGMATH_UNARY_REAL_IMAG_RET_REAL (Val, creal, creal)
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#define creal(Val) __TGMATH_UNARY_REAL_IMAG_RET_REAL_SAME (Val, creal)
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#endif /* tgmath.h */
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