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Add the FP comparison macros in <math.h> (from C99).

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These rely on a new internal function that has been added to ORCALib.
This commit is contained in:
Stephen Heumann 2021-11-02 21:59:01 -05:00
parent 73d194c12f
commit 1010f9a906
2 changed files with 20 additions and 0 deletions
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8
ORCACDefs/math.h
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@ -34,6 +34,7 @@ int __fpclassifyf(float);
int __fpclassifyd(double);
int __fpclassifyl(long double);
int __signbit(long double);
int __fpcompare(long double, long double, short);
#define fpclassify(x) _Generic((x), \
float: __fpclassifyf, \
@ -46,6 +47,13 @@ int __signbit(long double);
#define isnormal(x) (fpclassify(x) == FP_NORMAL)
#define signbit(x) __signbit(x)
#define isgreater(x,y) __fpcompare((x),(y),0x40)
#define isgreaterequal(x,y) __fpcompare((x),(y),0x42)
#define isless(x,y) __fpcompare((x),(y),0x80)
#define islessequal(x,y) __fpcompare((x),(y),0x82)
#define islessgreater(x,y) __fpcompare((x),(y),0xC0)
#define isunordered(x,y) __fpcompare((x),(y),0x01)
#ifndef __KeepNamespacePure__
#define arctan(x) atan(x)
#endif

12
cc.notes
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@ -845,6 +845,18 @@ void va_copy(va_list dest, va_list src);
The va_copy macro makes a copy of the va_list src, which must have been initialized by a call to va_start in a function taking variable arguments (plus possibly some number of calls to va_arg). After a call to va_copy, dest can be used to access the variable arguments in the same way as src. A corresponding call to va_end(dest) must be made in the function that called va_copy.
18. (C99) Several new function-like macros for comparison of floating-point numbers have been added:
#include <math.h>
int isgreater(real-floating x, real-floating y);
int isgreaterequal(real-floating x, real-floating y);
int isless(real-floating x, real-floating y);
int islessequal(real-floating x, real-floating y);
int islessgreater(real-floating x, real-floating y);
int isunordered(real-floating x, real-floating y);
These macros accept arguments of any real floating types, i.e. float, double, or long double. They return 1 if x and y have the indicated relationship, or 0 if they do not. These macros differ from the ordinary relational operators in that the macros will not raise the "invalid" floating-point exception if x and y are unordered because one or both is a quiet NaN. (In ORCA/C, they will raise the "invalid" exception for signaling NaNs.)
-- Compiler changes introduced in C 2.1.0 -----------------------------------
The Default .h File