arch/parisc/math-emu/fcnvfxt.c

Source file repositories/reference/linux-study-clean/arch/parisc/math-emu/fcnvfxt.c

File Facts

System
Linux kernel
Corpus path
arch/parisc/math-emu/fcnvfxt.c
Extension
.c
Size
7977 bytes
Lines
316
Domain
Architecture Layer
Bucket
arch/parisc
Inferred role
Architecture Layer: implementation source
Status
source implementation candidate

Why This File Exists

CPU and platform-specific kernel glue: boot entry, traps, syscall entry, interrupts, page tables, context switch, and low-level barriers.

Dependency Surface

Detected Declarations

Annotated Snippet

Sgl_isnotzero_mantissa(src) || Sgl_iszero_sign(src)) {
                        if (Sgl_iszero_sign(src)) result = 0x7fffffff;
                        else result = 0x80000000; 

	                if (Is_invalidtrap_enabled()) {
                            return(INVALIDEXCEPTION);
                        }
                        Set_invalidflag();
			*dstptr = result;
			return(NOEXCEPTION);
		}
	}
	/*
	 * Generate result
	 */
	if (src_exponent >= 0) {
		temp = src;
		Sgl_clear_signexponent_set_hidden(temp);
		Int_from_sgl_mantissa(temp,src_exponent);
		if (Sgl_isone_sign(src))  result = -Sgl_all(temp);
		else result = Sgl_all(temp);
		*dstptr = result;

		/* check for inexact */
		if (Sgl_isinexact_to_fix(src,src_exponent)) {
			if (Is_inexacttrap_enabled()) return(INEXACTEXCEPTION);
			else Set_inexactflag();
		}
	}
	else {
		*dstptr = 0;

		/* check for inexact */
		if (Sgl_isnotzero_exponentmantissa(src)) {
			if (Is_inexacttrap_enabled()) return(INEXACTEXCEPTION);
			else Set_inexactflag();
		}
	}
	return(NOEXCEPTION);
}

/*
 *  Single Floating-point to Double Fixed-point 
 */
/*ARGSUSED*/
int
sgl_to_dbl_fcnvfxt(
		    sgl_floating_point *srcptr,
		    unsigned int *_nullptr,
		    dbl_integer *dstptr,
		    unsigned int *status)
{
	register int src_exponent, resultp1;
	register unsigned int src, temp, resultp2;

	src = *srcptr;
	src_exponent = Sgl_exponent(src) - SGL_BIAS;

	/* 
	 * Test for overflow
	 */
	if (src_exponent > DBL_FX_MAX_EXP) {
		/* check for MININT */
		if ((src_exponent > DBL_FX_MAX_EXP + 1) || 
		Sgl_isnotzero_mantissa(src) || Sgl_iszero_sign(src)) {
                        if (Sgl_iszero_sign(src)) {
                              resultp1 = 0x7fffffff;
			      resultp2 = 0xffffffff;
			}
                        else {
			    resultp1 = 0x80000000; 
			    resultp2 = 0;
			}
	                if (Is_invalidtrap_enabled()) {
                            return(INVALIDEXCEPTION);
                        }
                        Set_invalidflag();
    		        Dint_copytoptr(resultp1,resultp2,dstptr);
			return(NOEXCEPTION);
		}
		Dint_set_minint(resultp1,resultp2);
		Dint_copytoptr(resultp1,resultp2,dstptr);
		return(NOEXCEPTION);
	}
	/*
	 * Generate result
	 */
	if (src_exponent >= 0) {
		temp = src;
		Sgl_clear_signexponent_set_hidden(temp);

Annotation

Implementation Notes