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libgcc: Small bitint_reduce_prec big-endian fixes

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The big-endian _BitInt support in libgcc was written without any
testing and so I haven't discovered I've made one mistake in it
(in multiple places).
The bitint_reduce_prec function attempts to optimize inputs
which have some larger precision but at runtime they are found
to need smaller number of limbs.
For little-endian that is handled just by returning smaller
precision (or negative precision for signed), but for
big-endian we need to adjust the passed in limb pointer so that
when it returns smaller precision the argument still contains
the least significant limbs for the returned precision.

2025-05-20  Jakub Jelinek  <jakub@redhat.com>

	* libgcc2.c (bitint_reduce_prec): For big endian
	__LIBGCC_BITINT_ORDER__ use ++*p and --*p instead of
	++p and --p.
	* soft-fp/bitint.h (bitint_reduce_prec): Likewise.
This commit is contained in:
Jakub Jelinek
2025-05-20 08:20:16 +02:00
committed by Jakub Jelinek
parent 1c32b55b99
commit 092dcef93d
2 changed files with 10 additions and 10 deletions
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10
libgcc/libgcc2.c
View File

@@ -1333,7 +1333,7 @@ bitint_reduce_prec (const UBILtype **p, SItype prec)
if (prec >= -1)
return -2;
#if __LIBGCC_BITINT_ORDER__ == __ORDER_BIG_ENDIAN__
++p;
++*p;
#else
--i;
#endif
@@ -1347,7 +1347,7 @@ bitint_reduce_prec (const UBILtype **p, SItype prec)
if (prec >= -1)
return -2;
#if __LIBGCC_BITINT_ORDER__ == __ORDER_BIG_ENDIAN__
++p;
++*p;
#else
--i;
#endif
@@ -1358,7 +1358,7 @@ bitint_reduce_prec (const UBILtype **p, SItype prec)
if ((Wtype) mslimb >= 0)
{
#if __LIBGCC_BITINT_ORDER__ == __ORDER_BIG_ENDIAN__
--p;
--*p;
#endif
return prec - 1;
}
@@ -1387,7 +1387,7 @@ bitint_reduce_prec (const UBILtype **p, SItype prec)
if (prec == 0)
return 1;
#if __LIBGCC_BITINT_ORDER__ == __ORDER_BIG_ENDIAN__
++p;
++*p;
#else
--i;
#endif
@@ -1400,7 +1400,7 @@ bitint_reduce_prec (const UBILtype **p, SItype prec)
if (prec == 0)
return 1;
#if __LIBGCC_BITINT_ORDER__ == __ORDER_BIG_ENDIAN__
++p;
++*p;
#else
--i;
#endif

10
libgcc/soft-fp/bitint.h
View File

@@ -76,7 +76,7 @@ bitint_reduce_prec (const UBILtype **p, SItype prec)
if (prec >= -1)
return -2;
#if __LIBGCC_BITINT_ORDER__ == __ORDER_BIG_ENDIAN__
++p;
++*p;
#else
--i;
#endif
@@ -90,7 +90,7 @@ bitint_reduce_prec (const UBILtype **p, SItype prec)
if (prec >= -1)
return -2;
#if __LIBGCC_BITINT_ORDER__ == __ORDER_BIG_ENDIAN__
++p;
++*p;
#else
--i;
#endif
@@ -101,7 +101,7 @@ bitint_reduce_prec (const UBILtype **p, SItype prec)
if ((BILtype) mslimb >= 0)
{
#if __LIBGCC_BITINT_ORDER__ == __ORDER_BIG_ENDIAN__
--p;
--*p;
#endif
return prec - 1;
}
@@ -130,7 +130,7 @@ bitint_reduce_prec (const UBILtype **p, SItype prec)
if (prec == 0)
return 1;
#if __LIBGCC_BITINT_ORDER__ == __ORDER_BIG_ENDIAN__
++p;
++*p;
#else
--i;
#endif
@@ -143,7 +143,7 @@ bitint_reduce_prec (const UBILtype **p, SItype prec)
if (prec == 0)
return 1;
#if __LIBGCC_BITINT_ORDER__ == __ORDER_BIG_ENDIAN__
++p;
++*p;
#else
--i;
#endif