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* Added tests for bignum->flonum.

This commit is contained in:
Abdulaziz Ghuloum 2007-06-10 20:32:48 +03:00
parent cde508d58c
commit 90feb453f5
5 changed files with 57 additions and 43 deletions
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bin/ikarus
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42
bin/ikarus-flonums.c
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@ -150,48 +150,6 @@ ikrt_fixnum_to_flonum(ikp x, ikpcb* pcb){
return r;
}
ikp
ikrt_bignum_to_flonum(ikp x, ikpcb* pcb){
ikp r = ik_alloc(pcb, flonum_size) + vector_tag;
ref(r, -vector_tag) = (ikp)flonum_tag;
unsigned int fst = (unsigned int) ref(x, -vector_tag);
int limbs = (fst >> bignum_length_shift);
double fl;
if(limbs == 1){
fl = ((unsigned int)ref(x, disp_bignum_data - vector_tag));
} else if(limbs == 2){
fl = ((unsigned int)ref(x, wordsize+disp_bignum_data - vector_tag));
fl *= exp2(32);
fl += ((unsigned int)ref(x, disp_bignum_data - vector_tag));
} else {
fl =
((unsigned int)ref(x, limbs * wordsize - wordsize +
disp_bignum_data - vector_tag));
fl *= exp2(32);
fl += ((unsigned int)ref(x, limbs * wordsize - (wordsize*2) +
disp_bignum_data - vector_tag));
fl *= exp2(32);
fl += ((unsigned int)ref(x, limbs * wordsize - (wordsize*3) +
disp_bignum_data - vector_tag));
fl *= exp2(limbs*wordsize*8-wordsize*8*3);
}
if((fst & bignum_sign_mask) != 0){
fl = -fl;
}
flonum_data(r) = fl;
#if 0
{
int i;
unsigned char* p = (unsigned char*)(r+disp_flonum_data-vector_tag);
for(i=0; i<8; i++){
fprintf(stderr, "%02x ", p[7-i]);
}
fprintf(stderr, "\n");
}
#endif
return r;
}
ikp
ikrt_fl_equal(ikp x, ikp y){
if(flonum_data(x) == flonum_data(y)){

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src/ikarus.boot
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4
src/run-tests.ss
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@ -2,7 +2,8 @@
(import (ikarus)
(tests reader)
(tests bytevectors))
(tests bytevectors)
(tests bignum-to-flonum))
(define (test-exact-integer-sqrt)
(define (f i j inc)
@ -20,4 +21,5 @@
(test-reader)
(test-bytevectors)
(test-exact-integer-sqrt)
(test-bignum-to-flonum)
(printf "Happy Happy Joy Joy\n")

54
src/tests/bignum-to-flonum.ss Normal file
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@ -0,0 +1,54 @@
(library (tests bignum-to-flonum)
(export test-bignum-to-flonum)
(import (ikarus) (tests framework))
(define (t x s)
(let ([fl (format "~a" (exact->inexact x))])
(unless (string=? s fl)
(error 'bignum->flonum
"incorrect result for ~s\n expected ~a, \n got ~a" x s fl))))
(define-syntax test*
(syntax-rules ()
[(_ name [num str] ...)
(define-tests name
[(lambda (x) (string=? str (number->string x))) (exact->inexact num)]
...)]))
(test* test-bignum-to-flonum
(1000000000 "1e9")
(2000000000 "2e9")
(4000000000 "4e9")
(-1000000000 "-1e9")
(-2000000000 "-2e9")
(-4000000000 "-4e9")
( 6000000000 "6e9")
(12000000000 "1.2e10")
(25000000000 "2.5e10")
(50000000000 "5e10")
(-6000000000 "-6e9")
(-12000000000 "-1.2e10")
(-25000000000 "-2.5e10")
(-50000000000 "-5e10")
(100000000000 "1e11")
(200000000000 "2e11")
(400000000000 "4e11")
(800000000000 "8e11")
(-100000000000 "-1e11")
(-200000000000 "-2e11")
(-400000000000 "-4e11")
(-800000000000 "-8e11")
(#x1FFFFFFFFFFFFF "9.007199254740991e15")
(#x3FFFFFFFFFFFFF "1.8014398509481984e16")
(#x7FFFFFFFFFFFFF "3.602879701896397e16")
(#xFFFFFFFFFFFFFF "7.205759403792794e16")
(#x1FFFFFFFFFFFFFF "1.4411518807585587e17")
(#x3FFFFFFFFFFFFFF "2.8823037615171174e17")
(#x7FFFFFFFFFFFFFF "5.764607523034235e17")
(#xFFFFFFFFFFFFFFF "1.152921504606847e18")
(#xFFFFFFFFFFFFFFFF "1.8446744073709552e19")
(1000000000000000000000 "1e21")
(100000000000000000000000000000 "1e29")
(100000000000000000000000000000000000000000000000 "1e47")
(-1000000000000000000000 "-1e21")
(-100000000000000000000000000000 "-1e29")
(-100000000000000000000000000000000000000000000000 "-1e47")))