🚀 go-pugleaf

The GCC manual says that TARGET_EDOM should not be defined if mathematical
functions on your system use `matherr' when there is an error.  The
mathematical functions in SunOS 4.1.2 (sparc) use `matherr', but
config/sparc.h defines TARGET_EDOM.  The following scenario illustrates the
discrepancy that this causes.

	$ cat t.c
	#include <math.h>
	int matherr (e) struct exception *e;  {
		printf("matherr invoked from %s\n", e->name);
		return 1;
	}
	main() {
		printf("sqrt(-1) == %g\n", sqrt(-1.0));
		return 0;
	}
	$ cc -O t.c -lm
	$ ./a.out
	matherr invoked from sqrt
	sqrt(-1) == NaN
	$ gcc -O t.c -lm
	$ ./a.out
	sqrt(-1) == NaN

The two outputs should be identical, but GCC's a.out doesn't invoke matherr so
the message is not printed.

Here is a patch.

Fri Nov  6 00:41:53 1992  Paul Eggert  (eggert@twinsun.com)

	* sparc.h (TARGET_EDOM, GEN_ERRNO_RTX): Removed, since Sun's
	math library invokes matherr.

===================================================================
RCS file: config/sparc.h,v
retrieving revision 2.3
retrieving revision 2.3.1.1
diff -c -r2.3 -r2.3.1.1
*** config/sparc.h	1992/10/20 21:12:29	2.3
--- config/sparc.h	1992/11/06 00:41:53	2.3.1.1
***************
*** 1277,1290 ****
     in one reasonably fast instruction.  */
  #define MOVE_MAX 8
  
- /* This is the value of the error code EDOM for this machine,
-    used by the sqrt instruction.  */
- #define TARGET_EDOM 33
- 
- /* This is how to refer to the variable errno.  */
- #define GEN_ERRNO_RTX \
-   gen_rtx (MEM, SImode, gen_rtx (SYMBOL_REF, Pmode, "errno"))
- 
  /* Define if normal loads of shorter-than-word items from memory clears
     the rest of the bigs in the register.  */
  #define BYTE_LOADS_ZERO_EXTEND
--- 1277,1282 ----