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improve abs() on floats for more correct and faster results

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This commit is contained in:
Laytan Laats
2025-02-05 21:17:48 +01:00
parent b86d2c30b6
commit b1068c7f2e
1 changed files with 28 additions and 0 deletions
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src/llvm_backend_proc.cpp
+28
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@@ -2174,7 +2174,35 @@ gb_internal lbValue lb_build_builtin_proc(lbProcedure *p, Ast *expr, TypeAndValu
case 128: return lb_emit_runtime_call(p, "abs_complex128", args); case 128: return lb_emit_runtime_call(p, "abs_complex128", args);
} }
GB_PANIC("Unknown complex type"); GB_PANIC("Unknown complex type");
} else if (is_type_float(t)) {
Type *t_float;
Type *t_unsigned;
lbValue mask;
switch (type_size_of(t)) {
case 2:
t_float = t_f16;
t_unsigned = t_u16;
mask = lb_const_int(p->module, t_unsigned, 0x7FFF);
break;
case 4:
t_float = t_f32;
t_unsigned = t_u32;
mask = lb_const_int(p->module, t_unsigned, 0x7FFFFFFF);
break;
case 8:
t_float = t_f64;
t_unsigned = t_u64;
mask = lb_const_int(p->module, t_unsigned, 0x7FFFFFFFFFFFFFFF);
break;
default:
GB_PANIC("abs: unhandled float size");
}
lbValue as_unsigned = lb_emit_transmute(p, x, t_unsigned);
lbValue abs = lb_emit_arith(p, Token_And, as_unsigned, mask, t_unsigned);
return lb_emit_transmute(p, abs, t_float);
} }
lbValue zero = lb_const_nil(p->module, t); lbValue zero = lb_const_nil(p->module, t);
lbValue cond = lb_emit_comp(p, Token_Lt, x, zero); lbValue cond = lb_emit_comp(p, Token_Lt, x, zero);
lbValue neg = lb_emit_unary_arith(p, Token_Sub, x, t); lbValue neg = lb_emit_unary_arith(p, Token_Sub, x, t);