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Use build host D compiler real type

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D needs to compile itself on non-x86 hosts where real type might be
something other than 80-bit extended precision.  The simplest approach
is to use the existing D compiler real type as it must already have
correct real.nan and snan intializer.

Note this does not work for cross-compiling to alternate targets and is
only intended as transitional until that capability is added.

Upstream commit: a776514edc914e2e09bd4298fb07f2ac99e86f45
This commit is contained in:
Dan Olson 2016-03-11 07:08:05 +00:00
parent fa8fe51eb6
commit 61bb66bccd
1 changed files with 4 additions and 16 deletions
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20
ddmd/root/port.d
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@ -84,20 +84,6 @@ extern (C++) struct Port
static __gshared bool yl2xp1_supported = false;
}
static __gshared real snan;
static this()
{
/*
* Use a payload which is different from the machine NaN,
* so that uninitialised variables can be
* detected even if exceptions are disabled.
*/
ushort* us = cast(ushort*)&snan;
us[0] = 0;
us[1] = 0;
us[2] = 0;
us[3] = 0xA000;
us[4] = 0x7FFF;
}
static bool isNan(double r)
{
@ -114,9 +100,11 @@ extern (C++) struct Port
return a % b;
}
static real fequal(real a, real b)
static bool fequal(real a, real b)
{
return memcmp(&a, &b, 10) == 0;
// don't compare pad bytes in extended precision
enum sz = (real.mant_dig == 64) ? 10 : real.sizeof;
return memcmp(&a, &b, sz) == 0;
}
static int memicmp(const char* s1, const char* s2, size_t n)