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simplify comptime floating-point @divTrunc

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Replace a conditional ceil/floor call with an unconditional trunc call.
This commit is contained in:
Ben Noordhuis 2018-06-27 16:20:04 +02:00
parent fd75e73ee9
commit 440c1d52b4
2 changed files with 7 additions and 24 deletions
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29
src/ir.cpp
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@ -7725,33 +7725,14 @@ static void float_div_trunc(ConstExprValue *out_val, ConstExprValue *op1, ConstE
} else if (op1->type->id == TypeTableEntryIdFloat) {
switch (op1->type->data.floating.bit_count) {
case 16:
{
double a = zig_f16_to_double(op1->data.x_f16);
double b = zig_f16_to_double(op2->data.x_f16);
double c = a / b;
if (c >= 0.0) {
c = floor(c);
} else {
c = ceil(c);
}
out_val->data.x_f16 = zig_double_to_f16(c);
return;
}
out_val->data.x_f16 = f16_div(op1->data.x_f16, op2->data.x_f16);
out_val->data.x_f16 = f16_roundToInt(out_val->data.x_f16, softfloat_round_minMag, false);
return;
case 32:
out_val->data.x_f32 = op1->data.x_f32 / op2->data.x_f32;
if (out_val->data.x_f32 >= 0.0) {
out_val->data.x_f32 = floorf(out_val->data.x_f32);
} else {
out_val->data.x_f32 = ceilf(out_val->data.x_f32);
}
out_val->data.x_f32 = truncf(op1->data.x_f32 / op2->data.x_f32);
return;
case 64:
out_val->data.x_f64 = op1->data.x_f64 / op2->data.x_f64;
if (out_val->data.x_f64 >= 0.0) {
out_val->data.x_f64 = floor(out_val->data.x_f64);
} else {
out_val->data.x_f64 = ceil(out_val->data.x_f64);
}
out_val->data.x_f64 = trunc(op1->data.x_f64 / op2->data.x_f64);
return;
case 128:
f128M_div(&op1->data.x_f128, &op2->data.x_f128, &out_val->data.x_f128);

2
test/cases/math.zig
View File

@ -33,6 +33,8 @@ fn testDivision() void {
assert(divTrunc(f16, -5.0, 3.0) == -1.0);
assert(divTrunc(f32, 5.0, 3.0) == 1.0);
assert(divTrunc(f32, -5.0, 3.0) == -1.0);
assert(divTrunc(f64, 5.0, 3.0) == 1.0);
assert(divTrunc(f64, -5.0, 3.0) == -1.0);
comptime {
assert(