Add qemu 2.4.0

Change-Id: Ic99cbad4b61f8b127b7dc74d04576c0bcbaaf4f5
Signed-off-by: Yang Zhang <yang.z.zhang@intel.com>

1 files changed, 489 insertions, 0 deletions

diff --git a/qemu/libdecnumber/dpd/decimal32.c b/qemu/libdecnumber/dpd/decimal32.c
new file mode 100644
index 000000000..095ab7565
--- /dev/null
+++ b/qemu/libdecnumber/dpd/decimal32.c
@@ -0,0 +1,489 @@
+/* Decimal 32-bit format module for the decNumber C Library.
+   Copyright (C) 2005, 2007 Free Software Foundation, Inc.
+   Contributed by IBM Corporation.  Author Mike Cowlishaw.
+
+   This file is part of GCC.
+
+   GCC is free software; you can redistribute it and/or modify it under
+   the terms of the GNU General Public License as published by the Free
+   Software Foundation; either version 2, or (at your option) any later
+   version.
+
+   In addition to the permissions in the GNU General Public License,
+   the Free Software Foundation gives you unlimited permission to link
+   the compiled version of this file into combinations with other
+   programs, and to distribute those combinations without any
+   restriction coming from the use of this file.  (The General Public
+   License restrictions do apply in other respects; for example, they
+   cover modification of the file, and distribution when not linked
+   into a combine executable.)
+
+   GCC is distributed in the hope that it will be useful, but WITHOUT ANY
+   WARRANTY; without even the implied warranty of MERCHANTABILITY or
+   FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+   for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with GCC; see the file COPYING.  If not, write to the Free
+   Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA
+   02110-1301, USA.  */
+
+/* ------------------------------------------------------------------ */
+/* Decimal 32-bit format module					      */
+/* ------------------------------------------------------------------ */
+/* This module comprises the routines for decimal32 format numbers.   */
+/* Conversions are supplied to and from decNumber and String.	      */
+/*								      */
+/* This is used when decNumber provides operations, either for all    */
+/* operations or as a proxy between decNumber and decSingle.	      */
+/*								      */
+/* Error handling is the same as decNumber (qv.).		      */
+/* ------------------------------------------------------------------ */
+#include <string.h>	      /* [for memset/memcpy] */
+#include <stdio.h>	      /* [for printf] */
+
+#include "libdecnumber/dconfig.h"
+#define	 DECNUMDIGITS  7      /* make decNumbers with space for 7 */
+#include "libdecnumber/decNumber.h"
+#include "libdecnumber/decNumberLocal.h"
+#include "libdecnumber/dpd/decimal32.h"
+
+/* Utility tables and routines [in decimal64.c] */
+extern const uInt   COMBEXP[32], COMBMSD[32];
+extern const uByte  BIN2CHAR[4001];
+
+extern void decDigitsToDPD(const decNumber *, uInt *, Int);
+extern void decDigitsFromDPD(decNumber *, const uInt *, Int);
+
+#if DECTRACE || DECCHECK
+void decimal32Show(const decimal32 *);		  /* for debug */
+extern void decNumberShow(const decNumber *);	  /* .. */
+#endif
+
+/* Useful macro */
+/* Clear a structure (e.g., a decNumber) */
+#define DEC_clear(d) memset(d, 0, sizeof(*d))
+
+/* ------------------------------------------------------------------ */
+/* decimal32FromNumber -- convert decNumber to decimal32	      */
+/*								      */
+/*   ds is the target decimal32					      */
+/*   dn is the source number (assumed valid)			      */
+/*   set is the context, used only for reporting errors		      */
+/*								      */
+/* The set argument is used only for status reporting and for the     */
+/* rounding mode (used if the coefficient is more than DECIMAL32_Pmax */
+/* digits or an overflow is detected).	If the exponent is out of the */
+/* valid range then Overflow or Underflow will be raised.	      */
+/* After Underflow a subnormal result is possible.		      */
+/*								      */
+/* DEC_Clamped is set if the number has to be 'folded down' to fit,   */
+/* by reducing its exponent and multiplying the coefficient by a      */
+/* power of ten, or if the exponent on a zero had to be clamped.      */
+/* ------------------------------------------------------------------ */
+decimal32 * decimal32FromNumber(decimal32 *d32, const decNumber *dn,
+			      decContext *set) {
+  uInt status=0;		   /* status accumulator */
+  Int ae;			   /* adjusted exponent */
+  decNumber  dw;		   /* work */
+  decContext dc;		   /* .. */
+  uInt *pu;			   /* .. */
+  uInt comb, exp;		   /* .. */
+  uInt targ=0;			   /* target 32-bit */
+
+  /* If the number has too many digits, or the exponent could be */
+  /* out of range then reduce the number under the appropriate */
+  /* constraints.  This could push the number to Infinity or zero, */
+  /* so this check and rounding must be done before generating the */
+  /* decimal32] */
+  ae=dn->exponent+dn->digits-1;		     /* [0 if special] */
+  if (dn->digits>DECIMAL32_Pmax		     /* too many digits */
+   || ae>DECIMAL32_Emax			     /* likely overflow */
+   || ae<DECIMAL32_Emin) {		     /* likely underflow */
+    decContextDefault(&dc, DEC_INIT_DECIMAL32); /* [no traps] */
+    dc.round=set->round;		     /* use supplied rounding */
+    decNumberPlus(&dw, dn, &dc);	     /* (round and check) */
+    /* [this changes -0 to 0, so enforce the sign...] */
+    dw.bits|=dn->bits&DECNEG;
+    status=dc.status;			     /* save status */
+    dn=&dw;				     /* use the work number */
+    } /* maybe out of range */
+
+  if (dn->bits&DECSPECIAL) {			  /* a special value */
+    if (dn->bits&DECINF) targ=DECIMAL_Inf<<24;
+     else {					  /* sNaN or qNaN */
+      if ((*dn->lsu!=0 || dn->digits>1)		  /* non-zero coefficient */
+       && (dn->digits<DECIMAL32_Pmax)) {	  /* coefficient fits */
+	decDigitsToDPD(dn, &targ, 0);
+	}
+      if (dn->bits&DECNAN) targ|=DECIMAL_NaN<<24;
+       else targ|=DECIMAL_sNaN<<24;
+      } /* a NaN */
+    } /* special */
+
+   else { /* is finite */
+    if (decNumberIsZero(dn)) {		     /* is a zero */
+      /* set and clamp exponent */
+      if (dn->exponent<-DECIMAL32_Bias) {
+	exp=0;				     /* low clamp */
+	status|=DEC_Clamped;
+	}
+       else {
+	exp=dn->exponent+DECIMAL32_Bias;     /* bias exponent */
+	if (exp>DECIMAL32_Ehigh) {	     /* top clamp */
+	  exp=DECIMAL32_Ehigh;
+	  status|=DEC_Clamped;
+	  }
+	}
+      comb=(exp>>3) & 0x18;		/* msd=0, exp top 2 bits .. */
+      }
+     else {				/* non-zero finite number */
+      uInt msd;				/* work */
+      Int pad=0;			/* coefficient pad digits */
+
+      /* the dn is known to fit, but it may need to be padded */
+      exp=(uInt)(dn->exponent+DECIMAL32_Bias);	  /* bias exponent */
+      if (exp>DECIMAL32_Ehigh) {		  /* fold-down case */
+	pad=exp-DECIMAL32_Ehigh;
+	exp=DECIMAL32_Ehigh;			  /* [to maximum] */
+	status|=DEC_Clamped;
+	}
+
+      /* fastpath common case */
+      if (DECDPUN==3 && pad==0) {
+	targ=BIN2DPD[dn->lsu[0]];
+	if (dn->digits>3) targ|=(uInt)(BIN2DPD[dn->lsu[1]])<<10;
+	msd=(dn->digits==7 ? dn->lsu[2] : 0);
+	}
+       else { /* general case */
+	decDigitsToDPD(dn, &targ, pad);
+	/* save and clear the top digit */
+	msd=targ>>20;
+	targ&=0x000fffff;
+	}
+
+      /* create the combination field */
+      if (msd>=8) comb=0x18 | ((exp>>5) & 0x06) | (msd & 0x01);
+	     else comb=((exp>>3) & 0x18) | msd;
+      }
+    targ|=comb<<26;		   /* add combination field .. */
+    targ|=(exp&0x3f)<<20;	   /* .. and exponent continuation */
+    } /* finite */
+
+  if (dn->bits&DECNEG) targ|=0x80000000;  /* add sign bit */
+
+  /* now write to storage; this is endian */
+  pu=(uInt *)d32->bytes;	   /* overlay */
+  *pu=targ;			   /* directly store the int */
+
+  if (status!=0) decContextSetStatus(set, status); /* pass on status */
+  /* decimal32Show(d32); */
+  return d32;
+  } /* decimal32FromNumber */
+
+/* ------------------------------------------------------------------ */
+/* decimal32ToNumber -- convert decimal32 to decNumber		      */
+/*   d32 is the source decimal32				      */
+/*   dn is the target number, with appropriate space		      */
+/* No error is possible.					      */
+/* ------------------------------------------------------------------ */
+decNumber * decimal32ToNumber(const decimal32 *d32, decNumber *dn) {
+  uInt msd;			   /* coefficient MSD */
+  uInt exp;			   /* exponent top two bits */
+  uInt comb;			   /* combination field */
+  uInt sour;			   /* source 32-bit */
+  const uInt *pu;		   /* work */
+
+  /* load source from storage; this is endian */
+  pu=(const uInt *)d32->bytes;	   /* overlay */
+  sour=*pu;			   /* directly load the int */
+
+  comb=(sour>>26)&0x1f;		   /* combination field */
+
+  decNumberZero(dn);		   /* clean number */
+  if (sour&0x80000000) dn->bits=DECNEG; /* set sign if negative */
+
+  msd=COMBMSD[comb];		   /* decode the combination field */
+  exp=COMBEXP[comb];		   /* .. */
+
+  if (exp==3) {			   /* is a special */
+    if (msd==0) {
+      dn->bits|=DECINF;
+      return dn;		   /* no coefficient needed */
+      }
+    else if (sour&0x02000000) dn->bits|=DECSNAN;
+    else dn->bits|=DECNAN;
+    msd=0;			   /* no top digit */
+    }
+   else {			   /* is a finite number */
+    dn->exponent=(exp<<6)+((sour>>20)&0x3f)-DECIMAL32_Bias; /* unbiased */
+    }
+
+  /* get the coefficient */
+  sour&=0x000fffff;		   /* clean coefficient continuation */
+  if (msd) {			   /* non-zero msd */
+    sour|=msd<<20;		   /* prefix to coefficient */
+    decDigitsFromDPD(dn, &sour, 3); /* process 3 declets */
+    return dn;
+    }
+  /* msd=0 */
+  if (!sour) return dn;		   /* easy: coefficient is 0 */
+  if (sour&0x000ffc00)		   /* need 2 declets? */
+    decDigitsFromDPD(dn, &sour, 2); /* process 2 declets */
+   else
+    decDigitsFromDPD(dn, &sour, 1); /* process 1 declet */
+  return dn;
+  } /* decimal32ToNumber */
+
+/* ------------------------------------------------------------------ */
+/* to-scientific-string -- conversion to numeric string		      */
+/* to-engineering-string -- conversion to numeric string	      */
+/*								      */
+/*   decimal32ToString(d32, string);				      */
+/*   decimal32ToEngString(d32, string);				      */
+/*								      */
+/*  d32 is the decimal32 format number to convert		      */
+/*  string is the string where the result will be laid out	      */
+/*								      */
+/*  string must be at least 24 characters			      */
+/*								      */
+/*  No error is possible, and no status can be set.		      */
+/* ------------------------------------------------------------------ */
+char * decimal32ToEngString(const decimal32 *d32, char *string){
+  decNumber dn;				/* work */
+  decimal32ToNumber(d32, &dn);
+  decNumberToEngString(&dn, string);
+  return string;
+  } /* decimal32ToEngString */
+
+char * decimal32ToString(const decimal32 *d32, char *string){
+  uInt msd;			   /* coefficient MSD */
+  Int  exp;			   /* exponent top two bits or full */
+  uInt comb;			   /* combination field */
+  char *cstart;			   /* coefficient start */
+  char *c;			   /* output pointer in string */
+  const uInt *pu;		   /* work */
+  const uByte *u;		   /* .. */
+  char *s, *t;			   /* .. (source, target) */
+  Int  dpd;			   /* .. */
+  Int  pre, e;			   /* .. */
+  uInt sour;			   /* source 32-bit */
+
+  /* load source from storage; this is endian */
+  pu=(const uInt *)d32->bytes;	   /* overlay */
+  sour=*pu;			   /* directly load the int */
+
+  c=string;			   /* where result will go */
+  if (((Int)sour)<0) *c++='-';	   /* handle sign */
+
+  comb=(sour>>26)&0x1f;		   /* combination field */
+  msd=COMBMSD[comb];		   /* decode the combination field */
+  exp=COMBEXP[comb];		   /* .. */
+
+  if (exp==3) {
+    if (msd==0) {		   /* infinity */
+      strcpy(c,	  "Inf");
+      strcpy(c+3, "inity");
+      return string;		   /* easy */
+      }
+    if (sour&0x02000000) *c++='s'; /* sNaN */
+    strcpy(c, "NaN");		   /* complete word */
+    c+=3;			   /* step past */
+    if ((sour&0x000fffff)==0) return string; /* zero payload */
+    /* otherwise drop through to add integer; set correct exp */
+    exp=0; msd=0;		   /* setup for following code */
+    }
+   else exp=(exp<<6)+((sour>>20)&0x3f)-DECIMAL32_Bias; /* unbiased */
+
+  /* convert 7 digits of significand to characters */
+  cstart=c;			   /* save start of coefficient */
+  if (msd) *c++='0'+(char)msd;	   /* non-zero most significant digit */
+
+  /* Now decode the declets.  After extracting each one, it is */
+  /* decoded to binary and then to a 4-char sequence by table lookup; */
+  /* the 4-chars are a 1-char length (significant digits, except 000 */
+  /* has length 0).  This allows us to left-align the first declet */
+  /* with non-zero content, then remaining ones are full 3-char */
+  /* length.  We use fixed-length memcpys because variable-length */
+  /* causes a subroutine call in GCC.  (These are length 4 for speed */
+  /* and are safe because the array has an extra terminator byte.) */
+  #define dpd2char u=&BIN2CHAR[DPD2BIN[dpd]*4];			  \
+		   if (c!=cstart) {memcpy(c, u+1, 4); c+=3;}	  \
+		    else if (*u)  {memcpy(c, u+4-*u, 4); c+=*u;}
+
+  dpd=(sour>>10)&0x3ff;		   /* declet 1 */
+  dpd2char;
+  dpd=(sour)&0x3ff;		   /* declet 2 */
+  dpd2char;
+
+  if (c==cstart) *c++='0';	   /* all zeros -- make 0 */
+
+  if (exp==0) {			   /* integer or NaN case -- easy */
+    *c='\0';			   /* terminate */
+    return string;
+    }
+
+  /* non-0 exponent */
+  e=0;				   /* assume no E */
+  pre=c-cstart+exp;
+  /* [here, pre-exp is the digits count (==1 for zero)] */
+  if (exp>0 || pre<-5) {	   /* need exponential form */
+    e=pre-1;			   /* calculate E value */
+    pre=1;			   /* assume one digit before '.' */
+    } /* exponential form */
+
+  /* modify the coefficient, adding 0s, '.', and E+nn as needed */
+  s=c-1;			   /* source (LSD) */
+  if (pre>0) {			   /* ddd.ddd (plain), perhaps with E */
+    char *dotat=cstart+pre;
+    if (dotat<c) {		   /* if embedded dot needed... */
+      t=c;				/* target */
+      for (; s>=dotat; s--, t--) *t=*s; /* open the gap; leave t at gap */
+      *t='.';				/* insert the dot */
+      c++;				/* length increased by one */
+      }
+
+    /* finally add the E-part, if needed; it will never be 0, and has */
+    /* a maximum length of 3 digits (E-101 case) */
+    if (e!=0) {
+      *c++='E';			   /* starts with E */
+      *c++='+';			   /* assume positive */
+      if (e<0) {
+	*(c-1)='-';		   /* oops, need '-' */
+	e=-e;			   /* uInt, please */
+	}
+      u=&BIN2CHAR[e*4];		   /* -> length byte */
+      memcpy(c, u+4-*u, 4);	   /* copy fixed 4 characters [is safe] */
+      c+=*u;			   /* bump pointer appropriately */
+      }
+    *c='\0';			   /* add terminator */
+    /*printf("res %s\n", string); */
+    return string;
+    } /* pre>0 */
+
+  /* -5<=pre<=0: here for plain 0.ddd or 0.000ddd forms (can never have E) */
+  t=c+1-pre;
+  *(t+1)='\0';				/* can add terminator now */
+  for (; s>=cstart; s--, t--) *t=*s;	/* shift whole coefficient right */
+  c=cstart;
+  *c++='0';				/* always starts with 0. */
+  *c++='.';
+  for (; pre<0; pre++) *c++='0';	/* add any 0's after '.' */
+  /*printf("res %s\n", string); */
+  return string;
+  } /* decimal32ToString */
+
+/* ------------------------------------------------------------------ */
+/* to-number -- conversion from numeric string			      */
+/*								      */
+/*   decimal32FromString(result, string, set);			      */
+/*								      */
+/*  result  is the decimal32 format number which gets the result of   */
+/*	    the conversion					      */
+/*  *string is the character string which should contain a valid      */
+/*	    number (which may be a special value)		      */
+/*  set	    is the context					      */
+/*								      */
+/* The context is supplied to this routine is used for error handling */
+/* (setting of status and traps) and for the rounding mode, only.     */
+/* If an error occurs, the result will be a valid decimal32 NaN.      */
+/* ------------------------------------------------------------------ */
+decimal32 * decimal32FromString(decimal32 *result, const char *string,
+				decContext *set) {
+  decContext dc;			     /* work */
+  decNumber dn;				     /* .. */
+
+  decContextDefault(&dc, DEC_INIT_DECIMAL32); /* no traps, please */
+  dc.round=set->round;			      /* use supplied rounding */
+
+  decNumberFromString(&dn, string, &dc);     /* will round if needed */
+  decimal32FromNumber(result, &dn, &dc);
+  if (dc.status!=0) {			     /* something happened */
+    decContextSetStatus(set, dc.status);     /* .. pass it on */
+    }
+  return result;
+  } /* decimal32FromString */
+
+/* ------------------------------------------------------------------ */
+/* decimal32IsCanonical -- test whether encoding is canonical	      */
+/*   d32 is the source decimal32				      */
+/*   returns 1 if the encoding of d32 is canonical, 0 otherwise	      */
+/* No error is possible.					      */
+/* ------------------------------------------------------------------ */
+uint32_t decimal32IsCanonical(const decimal32 *d32) {
+  decNumber dn;				/* work */
+  decimal32 canon;			/* .. */
+  decContext dc;			/* .. */
+  decContextDefault(&dc, DEC_INIT_DECIMAL32);
+  decimal32ToNumber(d32, &dn);
+  decimal32FromNumber(&canon, &dn, &dc);/* canon will now be canonical */
+  return memcmp(d32, &canon, DECIMAL32_Bytes)==0;
+  } /* decimal32IsCanonical */
+
+/* ------------------------------------------------------------------ */
+/* decimal32Canonical -- copy an encoding, ensuring it is canonical   */
+/*   d32 is the source decimal32				      */
+/*   result is the target (may be the same decimal32)		      */
+/*   returns result						      */
+/* No error is possible.					      */
+/* ------------------------------------------------------------------ */
+decimal32 * decimal32Canonical(decimal32 *result, const decimal32 *d32) {
+  decNumber dn;				/* work */
+  decContext dc;			/* .. */
+  decContextDefault(&dc, DEC_INIT_DECIMAL32);
+  decimal32ToNumber(d32, &dn);
+  decimal32FromNumber(result, &dn, &dc);/* result will now be canonical */
+  return result;
+  } /* decimal32Canonical */
+
+#if DECTRACE || DECCHECK
+/* Macros for accessing decimal32 fields.  These assume the argument
+   is a reference (pointer) to the decimal32 structure, and the
+   decimal32 is in network byte order (big-endian) */
+/* Get sign */
+#define decimal32Sign(d)       ((unsigned)(d)->bytes[0]>>7)
+
+/* Get combination field */
+#define decimal32Comb(d)       (((d)->bytes[0] & 0x7c)>>2)
+
+/* Get exponent continuation [does not remove bias] */
+#define decimal32ExpCon(d)     ((((d)->bytes[0] & 0x03)<<4)	      \
+			     | ((unsigned)(d)->bytes[1]>>4))
+
+/* Set sign [this assumes sign previously 0] */
+#define decimal32SetSign(d, b) {				      \
+  (d)->bytes[0]|=((unsigned)(b)<<7);}
+
+/* Set exponent continuation [does not apply bias] */
+/* This assumes range has been checked and exponent previously 0; */
+/* type of exponent must be unsigned */
+#define decimal32SetExpCon(d, e) {				      \
+  (d)->bytes[0]|=(uint8_t)((e)>>4);				      \
+  (d)->bytes[1]|=(uint8_t)(((e)&0x0F)<<4);}
+
+/* ------------------------------------------------------------------ */
+/* decimal32Show -- display a decimal32 in hexadecimal [debug aid]    */
+/*   d32 -- the number to show					      */
+/* ------------------------------------------------------------------ */
+/* Also shows sign/cob/expconfields extracted - valid bigendian only */
+void decimal32Show(const decimal32 *d32) {
+  char buf[DECIMAL32_Bytes*2+1];
+  Int i, j=0;
+
+  if (DECLITEND) {
+    for (i=0; i<DECIMAL32_Bytes; i++, j+=2) {
+      sprintf(&buf[j], "%02x", d32->bytes[3-i]);
+      }
+    printf(" D32> %s [S:%d Cb:%02x Ec:%02x] LittleEndian\n", buf,
+	   d32->bytes[3]>>7, (d32->bytes[3]>>2)&0x1f,
+	   ((d32->bytes[3]&0x3)<<4)| (d32->bytes[2]>>4));
+    }
+   else {
+    for (i=0; i<DECIMAL32_Bytes; i++, j+=2) {
+      sprintf(&buf[j], "%02x", d32->bytes[i]);
+      }
+    printf(" D32> %s [S:%d Cb:%02x Ec:%02x] BigEndian\n", buf,
+	   decimal32Sign(d32), decimal32Comb(d32), decimal32ExpCon(d32));
+    }
+  } /* decimal32Show */
+#endif