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std: remove incorrect float printing code

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This commit is contained in:
Andrew Kelley 2016-01-28 12:54:30 -07:00
parent 347866f3a7
commit 2fc4b3629a
1 changed files with 0 additions and 75 deletions
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75
std/std.zig
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@ -108,20 +108,6 @@ pub struct OutStream {
return amt_printed;
}
pub fn print_f64(os: &OutStream, x: f64) -> %isize {
if (os.index + max_f64_digits >= os.buffer.len) {
%return os.flush();
}
const amt_printed = buf_print_f64(os.buffer[os.index...], x);
os.index += amt_printed;
if (!os.buffered) {
%return os.flush();
}
return amt_printed;
}
pub fn flush(os: &OutStream) -> %void {
const amt_written = write(os.fd, os.buffer.ptr, os.index);
os.index = 0;
@ -243,67 +229,6 @@ pub fn buf_print_u64(out_buf: []u8, x: u64) -> isize {
return len;
}
pub fn buf_print_f64(out_buf: []u8, x: f64) -> isize {
if (x == f64_get_pos_inf()) {
const buf2 = "+Inf";
@memcpy(&out_buf[0], &buf2[0], buf2.len);
return 4;
} else if (x == f64_get_neg_inf()) {
const buf2 = "-Inf";
@memcpy(&out_buf[0], &buf2[0], buf2.len);
return 4;
} else if (f64_is_nan(x)) {
const buf2 = "NaN";
@memcpy(&out_buf[0], &buf2[0], buf2.len);
return 3;
}
var buf: [max_f64_digits]u8 = undefined;
var len: isize = 0;
// 1 sign bit
// 11 exponent bits
// 52 significand bits (+ 1 implicit always non-zero bit)
const bits = f64_to_bits(x);
if (bits & (1 << 63) != 0) {
buf[0] = '-';
len += 1;
}
const rexponent: i64 = i64((bits >> 52) & ((1 << 11) - 1));
const exponent = rexponent - 1023 - 52;
/*%%stdout.printf("exponent: ");
%%stdout.print_i64(exponent);
%%stdout.printf("\n");*/
if (rexponent == 0) {
buf[len] = '0';
len += 1;
@memcpy(&out_buf[0], &buf[0], len);
return len;
}
const sig = (bits & ((1 << 52) - 1)) | (1 << 52);
/*%%stdout.printf("significand: ");
%%stdout.print_u64(sig);
%%stdout.printf("\n");*/
len += buf_print_u64(buf[len...], sig);
buf[len] = '*';
len += 1;
buf[len] = '2';
len += 1;
buf[len] = '^';
len += 1;
len += buf_print_i64(buf[len...], exponent);
@memcpy(&out_buf[0], &buf[0], len);
len
}
fn min_isize(x: isize, y: isize) -> isize {
if (x < y) x else y
}