arch/mips/math-emu/ieee754int.h

Source file repositories/reference/linux-study-clean/arch/mips/math-emu/ieee754int.h

File Facts

System
Linux kernel
Corpus path
arch/mips/math-emu/ieee754int.h
Extension
.h
Size
3578 bytes
Lines
150
Domain
Architecture Layer
Bucket
arch/mips
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

if (vm) {						\
			ve = SP_EMIN;					\
			vc = IEEE754_CLASS_DNORM;			\
		} else							\
			vc = IEEE754_CLASS_ZERO;			\
	} else {							\
		ve -= SP_EBIAS;						\
		vm |= SP_HIDDEN_BIT;					\
		vc = IEEE754_CLASS_NORM;				\
	}								\
}
#define EXPLODEXSP EXPLODESP(x, xc, xs, xe, xm)
#define EXPLODEYSP EXPLODESP(y, yc, ys, ye, ym)
#define EXPLODEZSP EXPLODESP(z, zc, zs, ze, zm)


#define COMPXDP \
	u64 xm; int xe; int xs __maybe_unused; int xc

#define COMPYDP \
	u64 ym; int ye; int ys; int yc

#define COMPZDP \
	u64 zm; int ze; int zs; int zc

#define EXPLODEDP(v, vc, vs, ve, vm)					\
{									\
	vm = DPMANT(v);							\
	vs = DPSIGN(v);							\
	ve = DPBEXP(v);							\
	if (ve == DP_EMAX+1+DP_EBIAS) {					\
		if (vm == 0)						\
			vc = IEEE754_CLASS_INF;				\
		else if (ieee754_csr.nan2008 ^ !(vm & DP_MBIT(DP_FBITS - 1))) \
			vc = IEEE754_CLASS_QNAN;			\
		else							\
			vc = IEEE754_CLASS_SNAN;			\
	} else if (ve == DP_EMIN-1+DP_EBIAS) {				\
		if (vm) {						\
			ve = DP_EMIN;					\
			vc = IEEE754_CLASS_DNORM;			\
		} else							\
			vc = IEEE754_CLASS_ZERO;			\
	} else {							\
		ve -= DP_EBIAS;						\
		vm |= DP_HIDDEN_BIT;					\
		vc = IEEE754_CLASS_NORM;				\
	}								\
}
#define EXPLODEXDP EXPLODEDP(x, xc, xs, xe, xm)
#define EXPLODEYDP EXPLODEDP(y, yc, ys, ye, ym)
#define EXPLODEZDP EXPLODEDP(z, zc, zs, ze, zm)

#define FLUSHDP(v, vc, vs, ve, vm)					\
	if (vc==IEEE754_CLASS_DNORM) {					\
		if (ieee754_csr.nod) {					\
			ieee754_setcx(IEEE754_INEXACT);			\
			vc = IEEE754_CLASS_ZERO;			\
			ve = DP_EMIN-1+DP_EBIAS;			\
			vm = 0;						\
			v = ieee754dp_zero(vs);				\
		}							\
	}

#define FLUSHSP(v, vc, vs, ve, vm)					\
	if (vc==IEEE754_CLASS_DNORM) {					\
		if (ieee754_csr.nod) {					\
			ieee754_setcx(IEEE754_INEXACT);			\
			vc = IEEE754_CLASS_ZERO;			\
			ve = SP_EMIN-1+SP_EBIAS;			\
			vm = 0;						\
			v = ieee754sp_zero(vs);				\
		}							\
	}

#define FLUSHXDP FLUSHDP(x, xc, xs, xe, xm)
#define FLUSHYDP FLUSHDP(y, yc, ys, ye, ym)
#define FLUSHZDP FLUSHDP(z, zc, zs, ze, zm)
#define FLUSHXSP FLUSHSP(x, xc, xs, xe, xm)
#define FLUSHYSP FLUSHSP(y, yc, ys, ye, ym)
#define FLUSHZSP FLUSHSP(z, zc, zs, ze, zm)

#endif /* __IEEE754INT_H  */

Annotation

Implementation Notes