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test: override gcc bug when preparing complex divide tables

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R=iant
CC=golang-dev
https://golang.org/cl/1666048
This commit is contained in:
Russ Cox 2010-06-30 23:34:27 -07:00
parent 93f614ff86
commit 47c85ec97a
2 changed files with 30 additions and 8 deletions
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23
test/cmplxdivide.c
View File

@ -37,6 +37,14 @@ fmt(double g)
return p;
}
int
iscnan(double complex d)
{
return !isinf(creal(d)) && !isinf(cimag(d)) && (isnan(creal(d)) || isnan(cimag(d)));
}
double complex zero; // attempt to hide zero division from gcc
int
main(void)
{
@ -54,7 +62,20 @@ main(void)
n = f[i] + f[j]*I;
d = f[k] + f[l]*I;
q = n/d;
printf("\tTest{cmplx(%s, %s), cmplx(%s, %s), cmplx(%s, %s)},\n", fmt(creal(n)), fmt(cimag(n)), fmt(creal(d)), fmt(cimag(d)), fmt(creal(q)), fmt(cimag(q)));
// BUG FIX.
// Gcc gets the wrong answer for NaN/0 unless both sides are NaN.
// That is, it treats (NaN+NaN*I)/0 = NaN+NaN*I (a complex NaN)
// but it then computes (1+NaN*I)/0 = Inf+NaN*I (a complex infinity).
// Since both numerators are complex NaNs, it seems that the
// results should agree in kind. Override the gcc computation in this case.
if(iscnan(n) && d == 0)
q = (NAN+NAN*I) / zero;
printf("\tTest{cmplx(%s, %s), cmplx(%s, %s), cmplx(%s, %s)},\n",
fmt(creal(n)), fmt(cimag(n)),
fmt(creal(d)), fmt(cimag(d)),
fmt(creal(q)), fmt(cimag(q)));
}
printf("}\n");
return 0;

13
test/cmplxdivide1.go
View File

@ -1,6 +1,7 @@
// # generated by cmplxdivide.c
package main
var tests = []Test{
Test{cmplx(0, 0), cmplx(0, 0), cmplx(nan, nan)},
Test{cmplx(0, 0), cmplx(0, 1), cmplx(0, 0)},
@ -541,7 +542,7 @@ var tests = []Test{
Test{cmplx(1, 2), cmplx(-inf, nan), cmplx(negzero, negzero)},
Test{cmplx(1, 2), cmplx(-inf, inf), cmplx(0, negzero)},
Test{cmplx(1, 2), cmplx(-inf, -inf), cmplx(negzero, negzero)},
Test{cmplx(1, nan), cmplx(0, 0), cmplx(inf, nan)},
Test{cmplx(1, nan), cmplx(0, 0), cmplx(nan, nan)},
Test{cmplx(1, nan), cmplx(0, 1), cmplx(nan, nan)},
Test{cmplx(1, nan), cmplx(0, -1), cmplx(nan, nan)},
Test{cmplx(1, nan), cmplx(0, 2), cmplx(nan, nan)},
@ -884,7 +885,7 @@ var tests = []Test{
Test{cmplx(-1, 2), cmplx(-inf, nan), cmplx(0, negzero)},
Test{cmplx(-1, 2), cmplx(-inf, inf), cmplx(0, negzero)},
Test{cmplx(-1, 2), cmplx(-inf, -inf), cmplx(negzero, negzero)},
Test{cmplx(-1, nan), cmplx(0, 0), cmplx(-inf, nan)},
Test{cmplx(-1, nan), cmplx(0, 0), cmplx(nan, nan)},
Test{cmplx(-1, nan), cmplx(0, 1), cmplx(nan, nan)},
Test{cmplx(-1, nan), cmplx(0, -1), cmplx(nan, nan)},
Test{cmplx(-1, nan), cmplx(0, 2), cmplx(nan, nan)},
@ -1227,7 +1228,7 @@ var tests = []Test{
Test{cmplx(2, 2), cmplx(-inf, nan), cmplx(negzero, negzero)},
Test{cmplx(2, 2), cmplx(-inf, inf), cmplx(0, negzero)},
Test{cmplx(2, 2), cmplx(-inf, -inf), cmplx(negzero, 0)},
Test{cmplx(2, nan), cmplx(0, 0), cmplx(inf, nan)},
Test{cmplx(2, nan), cmplx(0, 0), cmplx(nan, nan)},
Test{cmplx(2, nan), cmplx(0, 1), cmplx(nan, nan)},
Test{cmplx(2, nan), cmplx(0, -1), cmplx(nan, nan)},
Test{cmplx(2, nan), cmplx(0, 2), cmplx(nan, nan)},
@ -1423,7 +1424,7 @@ var tests = []Test{
Test{cmplx(nan, 0), cmplx(-inf, nan), cmplx(nan, nan)},
Test{cmplx(nan, 0), cmplx(-inf, inf), cmplx(nan, nan)},
Test{cmplx(nan, 0), cmplx(-inf, -inf), cmplx(nan, nan)},
Test{cmplx(nan, 1), cmplx(0, 0), cmplx(nan, inf)},
Test{cmplx(nan, 1), cmplx(0, 0), cmplx(nan, nan)},
Test{cmplx(nan, 1), cmplx(0, 1), cmplx(nan, nan)},
Test{cmplx(nan, 1), cmplx(0, -1), cmplx(nan, nan)},
Test{cmplx(nan, 1), cmplx(0, 2), cmplx(nan, nan)},
@ -1472,7 +1473,7 @@ var tests = []Test{
Test{cmplx(nan, 1), cmplx(-inf, nan), cmplx(nan, nan)},
Test{cmplx(nan, 1), cmplx(-inf, inf), cmplx(nan, nan)},
Test{cmplx(nan, 1), cmplx(-inf, -inf), cmplx(nan, nan)},
Test{cmplx(nan, -1), cmplx(0, 0), cmplx(nan, -inf)},
Test{cmplx(nan, -1), cmplx(0, 0), cmplx(nan, nan)},
Test{cmplx(nan, -1), cmplx(0, 1), cmplx(nan, nan)},
Test{cmplx(nan, -1), cmplx(0, -1), cmplx(nan, nan)},
Test{cmplx(nan, -1), cmplx(0, 2), cmplx(nan, nan)},
@ -1521,7 +1522,7 @@ var tests = []Test{
Test{cmplx(nan, -1), cmplx(-inf, nan), cmplx(nan, nan)},
Test{cmplx(nan, -1), cmplx(-inf, inf), cmplx(nan, nan)},
Test{cmplx(nan, -1), cmplx(-inf, -inf), cmplx(nan, nan)},
Test{cmplx(nan, 2), cmplx(0, 0), cmplx(nan, inf)},
Test{cmplx(nan, 2), cmplx(0, 0), cmplx(nan, nan)},
Test{cmplx(nan, 2), cmplx(0, 1), cmplx(nan, nan)},
Test{cmplx(nan, 2), cmplx(0, -1), cmplx(nan, nan)},
Test{cmplx(nan, 2), cmplx(0, 2), cmplx(nan, nan)},