InterlockedAdd and co. suddenly broken

[coffeenotfound]

Description
The atomic functions like InterlockedAdd are suddenly not functioning anymore,
complaining that the destination cannot be converted to an int& or long& reference.

This affects both groupshared and RWTexture2D destinations (and probably all others too)

I'm at a loss why this is now suddenly happening when it worked perfectly all the time

test.hlsl:6:2: error: no matching function for call to 'InterlockedAdd'
        InterlockedAdd(foo, 1.0);
        ^~~~~~~~~~~~~~
test.hlsl:6:2: note: candidate function not viable: no known conversion from '__attribute__((address_space(3))) float' to 'unsigned long long &' for 1st argument
        InterlockedAdd(foo, 1.0);
        ^              ~~~
test.hlsl:6:2: note: candidate function not viable: no known conversion from '__attribute__((address_space(3))) float' to 'int &' for 1st argument
        InterlockedAdd(foo, 1.0);
        ^              ~~~

Steps to Reproduce
Test code:

groupshared float foo;

[numthreads(64, 1, 1)]
void main() {
	InterlockedAdd(foo, 1.0);
}

dxc -E main -T cs_6_4 test.hlsl

Actual Behavior
The above code should compile successfully

Environment

• DXC version: "libdxcompiler.so: 1.8(dev;4662-416fab6b); libdxil.so: 1.8" (the newest release version from July 2024)
• Host Operating System Linux 6.12.3-arch1-1

[damyanp]

InterlockedAdd is documented as only working on int or uints.

[coffeenotfound]

Ah, that would explain it. Though I swear, I have used it on floats before...