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Diffstat (limited to 'lib/builtins/subtf3.c')
-rw-r--r-- | lib/builtins/subtf3.c | 27 |
1 files changed, 27 insertions, 0 deletions
diff --git a/lib/builtins/subtf3.c b/lib/builtins/subtf3.c new file mode 100644 index 000000000000..609b816f41e3 --- /dev/null +++ b/lib/builtins/subtf3.c @@ -0,0 +1,27 @@ +//===-- lib/subtf3.c - Quad-precision subtraction -----------------*- C -*-===// +// +// The LLVM Compiler Infrastructure +// +// This file is dual licensed under the MIT and the University of Illinois Open +// Source Licenses. See LICENSE.TXT for details. +// +//===----------------------------------------------------------------------===// +// +// This file implements quad-precision soft-float subtraction with the +// IEEE-754 default rounding (to nearest, ties to even). +// +//===----------------------------------------------------------------------===// + +#define QUAD_PRECISION +#include "fp_lib.h" + +#if defined(CRT_HAS_128BIT) && defined(CRT_LDBL_128BIT) +COMPILER_RT_ABI fp_t __addtf3(fp_t a, fp_t b); + +// Subtraction; flip the sign bit of b and add. +COMPILER_RT_ABI fp_t +__subtf3(fp_t a, fp_t b) { + return __addtf3(a, fromRep(toRep(b) ^ signBit)); +} + +#endif |