https://issues.dlang.org/show_bug.cgi?id=19443
ponce <alil...@gmail.com> changed: What |Removed |Added ---------------------------------------------------------------------------- Status|RESOLVED |REOPENED CC| |alil...@gmail.com Resolution|WORKSFORME |--- --- Comment #4 from ponce <alil...@gmail.com> --- Unfortunately it isn't resolved. Consider this test case, built with DMD from 7 jan 2021 at commit 4f18b2798ad8fa337b8b71e4d2dd0d983adf9868 (with digger) void main() { float4 a = [1.0f, 2.0f, 3.0f, 4.0f]; float4 b = [5.0f, 6.0f, 7.0f, 8.0f]; float4 r = cast(float4) __simd(XMM.MOVHLPS, a, b); float[4] correct = [7.0f, 8.0f, 3.0f, 4.0f]; assert(r.array == correct); // FAIL, produces [5, 6, 3, 4] instead } and indeed Godbolt can show how it generated MOVLPS instead of MOVHLPS: https://d.godbolt.org/z/43n5KP --