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compile-time f32, f64 operations are now correctly lossy

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previously we used the bigfloat abstraction to do all
compile-time float math. but runtime code and comptime code
are supposed to get the same result. so now if you add a
f32 to a f32 at compile time it does it with f32 math
instead of the bigfloat. float literals still get the
bigfloat math.

closes #424
This commit is contained in:
Andrew Kelley
2017-08-20 00:33:05 -04:00
parent c73a0c92d0
commit 09bd4a9a86
14 changed files with 808 additions and 110 deletions
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4
src/tokenizer.cpp
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@@ -257,7 +257,7 @@ static void set_token_id(Tokenize *t, Token *token, TokenId id) {
if (id == TokenIdIntLiteral) {
bigint_init_unsigned(&token->data.int_lit.bigint, 0);
} else if (id == TokenIdFloatLiteral) {
bigfloat_init_float(&token->data.float_lit.bigfloat, 0.0);
bigfloat_init_32(&token->data.float_lit.bigfloat, 0.0f);
token->data.float_lit.overflow = false;
} else if (id == TokenIdStringLiteral || id == TokenIdSymbol) {
memset(&token->data.str_lit.str, 0, sizeof(Buf));
@@ -345,7 +345,7 @@ static void end_float_token(Tokenize *t) {
uint64_t double_bits = (exponent_bits << 52) | significand_bits;
double dbl_value;
safe_memcpy(&dbl_value, (double *)&double_bits, 1);
bigfloat_init_float(&t->cur_tok->data.float_lit.bigfloat, dbl_value);
bigfloat_init_64(&t->cur_tok->data.float_lit.bigfloat, dbl_value);
}
static void end_token(Tokenize *t) {