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GP-0 Added ability to ignore specific pcode test failures. Corrected

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BigInteger to BigFloat conversion used by INT2FLOAT emulation op.
This commit is contained in:
ghidra1 2023-03-08 21:32:26 +00:00
parent a3ca5a67e1
commit f56e922d43
9 changed files with 284 additions and 105 deletions
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18
Ghidra/Framework/SoftwareModeling/src/main/java/ghidra/pcode/floatformat/BigFloat.java
View file

@ -60,8 +60,7 @@ public strictfp class BigFloat implements Comparable<BigFloat> {
* @param scale value's scale (signed value with the biased range of expbits)
* @throws IllegalArgumentException if invalid unscaled and scale values are specified based upon the fracbits and expbits values.
*/
BigFloat(int fracbits, int expbits, FloatKind kind, int sign, BigInteger unscaled,
int scale) {
BigFloat(int fracbits, int expbits, FloatKind kind, int sign, BigInteger unscaled, int scale) {
this.fracbits = fracbits;
this.expbits = expbits;
this.kind = kind;
@ -151,21 +150,6 @@ public strictfp class BigFloat implements Comparable<BigFloat> {
return true;
}
/**
* Return the BigFloat with the given number of bits representing the given BigInteger.
*
* @param fracbits number of fractional bits
* @param expbits number of bits in the exponent
* @param i an integer
* @return a BigFloat representing i
*/
public static BigFloat valueOf(int fracbits, int expbits, BigInteger i) {
BigFloat f = new BigFloat(fracbits, expbits, FloatKind.FINITE, i.signum() >= 0 ? +1 : -1,
i.abs(), fracbits);
f.scaleUpTo(fracbits + 1);
return f;
}
/**
* Return the BigFloat with the given number of bits representing zero.
*

25
Ghidra/Framework/SoftwareModeling/src/main/java/ghidra/pcode/floatformat/FloatFormat.java
View file

@ -897,7 +897,7 @@ public strictfp class FloatFormat {
else {
a = Utils.convertToUnsignedValue(a, sizein);
}
return getEncoding(BigFloat.valueOf(frac_size, exp_size, a));
return getEncoding(valueOf(a));
}
public long opFloat2Float(long a, FloatFormat outformat) { // convert between floating
@ -967,5 +967,28 @@ public strictfp class FloatFormat {
fa.round();
return getEncoding(fa);
}
public BigFloat valueOf(BigInteger value) {
BigInteger unscaled = value;
int sign = 1;
if (unscaled.signum() < 0) {
sign = -1;
unscaled = unscaled.negate();
}
int ulen = unscaled.bitLength();
int shift = frac_size + 1 - ulen;
unscaled = unscaled.shiftLeft(shift);
int scale = frac_size - shift;
if (scale > bias) {
return BigFloat.infinity(frac_size, exp_size, sign);
}
return new BigFloat(frac_size, exp_size, FloatKind.FINITE, sign, unscaled, scale);
}
}