https://issues.dlang.org/show_bug.cgi?id=15956
Issue ID: 15956
Summary: Incorrect value inside enum using simd vectors, weird
tym errors, and weird if(true) {} partial solution.
Product: D
Version: D2
Hardware: x86_64
OS: Linux
Status: NEW
Severity: major
Priority: P1
Component: dmd
Assignee: [email protected]
Reporter: [email protected]
Consider this piece of code:
import std.stdio : writeln;
struct vec4 {
import core.simd;
string toString() const {
import std.format : format;
return "%s\t%s\t%s\t%s".format(vec.array[0], vec.array[1],
vec.array[2], vec.array[3]);
}
float4 vec;
this(in float[4] arr) {
vec.array = arr;
}
// Switching the constructor out with this removes the if(true) error
and corrects the value inside the enum.
/+
this(in float4 arr) {
vec = arr;
}
+/
}
void main(string[] _ARGS) {
enum vec4 enm = [1, 0.4, 0.6, 1];
enm.writeln;
vec4 rntime = [1, 0.4, 0.6, 1];
rntime.writeln;
// When uncommented causes error: incompatible types for ((rntime.vec) ==
(vec4([1.00000F, 0.4F, 0.6F, 1.00000F]).vec)): '__vector(float[4])' and
'__vector(float[4])'
// writeln(rntime == enm); Comparing only vec explicitly doesn't work
either.
// When commented causes error:
// tym = x1d
// Internal error: backend/cgxmm.c 547
if(true) {} // Condition can really be anything.
}
Output:
1 0 0 0 // enm
1 0.4 0.6 1 // rntime
Output with -O:
1 0.4 0.6 1 // enm
1 0.4 0.6 1 // rntime
As you can see, the value inside the enum is not the value one would expect
there to be. There is also the error in comparing the two struct and the weird
if(true) clause.
--
