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tic4x-coff: ubsan: various shift UB

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* config/tc-tic4x.c (tic4x_gen_to_words): Rewrite mantissa
	overflow test without UB.  Avoid other UB shifts by making them
	unsigned.
This commit is contained in:
Alan Modra
2020-08-30 23:43:54 +09:30
parent e840f2e3e2
commit 737d219034
2 changed files with 12 additions and 10 deletions
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6
gas/ChangeLog
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@ -1,3 +1,9 @@
2020-08-30 Alan Modra <amodra@gmail.com>
* config/tc-tic4x.c (tic4x_gen_to_words): Rewrite mantissa
overflow test without UB. Avoid other UB shifts by making them
unsigned.
2020-08-31 Cooper Qu <cooper.qu@linux.alibaba.com>
* config/tc-csky.c (csky_error_state): New member 'arg_int'.

16
gas/config/tc-tic4x.c
View File

@ -453,8 +453,8 @@ tic4x_gen_to_words (FLONUM_TYPE flonum, LITTLENUM_TYPE *words, int precision)
/* Store the mantissa data into smant and the roundbit into rbit */
for (p = flonum.leader; p >= flonum.low && shift > -16; p--)
{
tmp = shift >= 0 ? *p << shift : *p >> -shift;
rbit = shift < 0 ? ((*p >> (-shift-1)) & 0x1) : 0;
tmp = shift >= 0 ? (unsigned) *p << shift : (unsigned) *p >> -shift;
rbit = shift < 0 ? (((unsigned) *p >> (-shift-1)) & 0x1) : 0;
smant |= tmp;
shift -= 16;
}
@ -463,18 +463,14 @@ tic4x_gen_to_words (FLONUM_TYPE flonum, LITTLENUM_TYPE *words, int precision)
if(rbit)
{
/* If the mantissa is going to overflow when added, lets store
the extra bit in mover. -- A special case exists when
mantissa_bits is 31 (E_PRECISION). Then the first test cannot
be trusted, as result is host-dependent, thus the second
test. */
if( smant == ((unsigned)(1<<(mantissa_bits+1))-1)
|| smant == (unsigned)-1 ) /* This is to catch E_PRECISION cases */
the extra bit in mover. */
if (smant == (1u << mantissa_bits << 1) - 1)
mover=1;
smant++;
}
/* Get the scaled one value */
sone = (1 << (mantissa_bits));
sone = 1u << mantissa_bits;
/* The number may be unnormalised so renormalise it... */
if(mover)
@ -527,7 +523,7 @@ tic4x_gen_to_words (FLONUM_TYPE flonum, LITTLENUM_TYPE *words, int precision)
else
{
/* Insert the exponent data into the word */
sfract |= exponent << (mantissa_bits+1);
sfract |= (unsigned) exponent << (mantissa_bits + 1);
if (precision == S_PRECISION)
words[0] = sfract;