remove some magic numbers from float printing
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850f6d2d02
commit
a6c2b013fd
12
std/std.zig
12
std/std.zig
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@ -244,6 +244,10 @@ pub fn buf_print_u64(out_buf: []u8, x: u64) -> isize {
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}
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pub fn buf_print_f64(out_buf: []u8, x: f64, decimals: isize) -> isize {
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const numExpBits = 11;
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const numRawSigBits = 52; // not including implicit 1 bit
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const expBias = 1023;
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var decs = decimals;
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if (decs >= max_u64_base10_digits) {
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decs = max_u64_base10_digits - 1;
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@ -277,8 +281,8 @@ pub fn buf_print_f64(out_buf: []u8, x: f64, decimals: isize) -> isize {
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len += 1;
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}
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const rexponent: i64 = i64((bits >> 52) & ((1 << 11) - 1));
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const exponent = rexponent - 1023 - 52;
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const rexponent: i64 = i64((bits >> numRawSigBits) & ((1 << numExpBits) - 1));
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const exponent = rexponent - expBias - numRawSigBits;
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if (rexponent == 0) {
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buf[len] = '0';
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@ -287,12 +291,12 @@ pub fn buf_print_f64(out_buf: []u8, x: f64, decimals: isize) -> isize {
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return len;
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}
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const sig = (bits & ((1 << 52) - 1)) | (1 << 52);
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const sig = (bits & ((1 << numRawSigBits) - 1)) | (1 << numRawSigBits);
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if (exponent >= 0) {
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// number is an integer
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if (exponent >= 11) {
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if (exponent >= 64 - 53) {
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// use XeX form
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// TODO support printing large floats
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