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(file header): Add comment describing sdiv_qrnnd. 

From-SVN: r2627
This commit is contained in:
Torbjorn Granlund 1992-10-28 10:51:33 +00:00
parent 7aeb7aebc6
commit b6d2adc7d9
1 changed files with 7 additions and 3 deletions
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10
gcc/longlong.h
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@ -42,18 +42,22 @@
If, in addition, the most significant bit of DENOMINATOR must be 1,
then the pre-processor symbol UDIV_NEEDS_NORMALIZATION is defined to 1.
4) count_leading_zeros(count, x) counts the number of zero-bits from
4) sdiv_qrnnd(quotient, remainder, high_numerator, low_numerator,
denominator). Like udiv_qrnnd but the numbers are signed. The
quotient is rounded towards 0.
5) count_leading_zeros(count, x) counts the number of zero-bits from
the msb to the first non-zero bit. This is the number of steps X
needs to be shifted left to set the msb. Undefined for X == 0.
5) add_ssaaaa(high_sum, low_sum, high_addend_1, low_addend_1,
6) add_ssaaaa(high_sum, low_sum, high_addend_1, low_addend_1,
high_addend_2, low_addend_2) adds two two-word unsigned integers,
composed by HIGH_ADDEND_1 and LOW_ADDEND_1, and HIGH_ADDEND_2 and
LOW_ADDEND_2 respectively. The result is placed in HIGH_SUM and
LOW_SUM. Overflow (i.e. carry out) is not stored anywhere, and is
lost.
6) sub_ddmmss(high_difference, low_difference, high_minuend,
7) sub_ddmmss(high_difference, low_difference, high_minuend,
low_minuend, high_subtrahend, low_subtrahend) subtracts two
two-word unsigned integers, composed by HIGH_MINUEND_1 and
LOW_MINUEND_1, and HIGH_SUBTRAHEND_2 and LOW_SUBTRAHEND_2