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[/] [openrisc/] [trunk/] [gnu-dev/] [or1k-gcc/] [libgo/] [runtime/] [go-matherr.c] - Rev 848
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/* go-matherr.c -- a Go version of the matherr function. Copyright 2012 The Go Authors. All rights reserved. Use of this source code is governed by a BSD-style license that can be found in the LICENSE file. */ /* The gccgo version of the math library calls libc functions. On some systems, such as Solaris, those functions will call matherr on exceptional conditions. This is a version of matherr appropriate for Go, one which returns the values that the Go math library expects. This is fine for pure Go programs. For mixed Go and C programs this will be problematic if the C programs themselves use matherr. Normally the C version of matherr will override this, and the Go code will just have to cope. If this turns out to be too problematic we can change to run pure Go code in the math library on systems that use matherr. */ #include <math.h> #include <stdint.h> #include "config.h" #if defined(HAVE_MATHERR) && defined(HAVE_STRUCT_EXCEPTION) #define PI 3.14159265358979323846264338327950288419716939937510582097494459 int matherr (struct exception* e) { const char *n; if (e->type != DOMAIN) return 0; n = e->name; if (__builtin_strcmp (n, "acos") == 0 || __builtin_strcmp (n, "asin") == 0) e->retval = __builtin_nan (""); else if (__builtin_strcmp (n, "atan2") == 0) { if (e->arg1 == 0 && e->arg2 == 0) { double nz; nz = -0.0; if (__builtin_memcmp (&e->arg2, &nz, sizeof (double)) != 0) e->retval = e->arg1; else e->retval = copysign (PI, e->arg1); } else return 0; } else if (__builtin_strcmp (n, "log") == 0 || __builtin_strcmp (n, "log10") == 0) e->retval = __builtin_nan (""); else if (__builtin_strcmp (n, "pow") == 0) { if (e->arg1 < 0) e->retval = __builtin_nan (""); else if (e->arg1 == 0 && e->arg2 == 0) e->retval = 1.0; else if (e->arg1 == 0 && e->arg2 < 0) { double i; if (modf (e->arg2, &i) == 0 && ((int64_t) i & 1) == 1) e->retval = copysign (__builtin_inf (), e->arg1); else e->retval = __builtin_inf (); } else return 0; } else if (__builtin_strcmp (n, "sqrt") == 0) { if (e->arg1 < 0) e->retval = __builtin_nan (""); else return 0; } else return 0; return 1; } #endif
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