Bug 9115 – Internal error when compiling core.simd float4 expression

Trying to compile this program: --- import std.stdio; import core.simd; void main() { float4 a = 0; float4 b = 1; writefln ("a = %(%s %)", a.array); writefln ("b = %(%s %)", b.array); //float4 c = a - b; //this works //writefln ("a - b = %(%s %)", c.array); //this doesn't writefln ("a - b = %(%s %)", (a-b).array); //this doesn't } --- Results in "Internal error: e2ir.c 155" with "DMD64 D Compiler v2.060" on OS X 10.8.2 The errors seems to be with the expression "(a-b).array". If I use a variable to store the expression value first, then all is well.

useOPstrpar asserts that e->TY is set, and CastExp::toElem doesn't set it. I tried setting it, but then it errors deep inside gcxmm.c https://github.com/yebblies/dmd/tree/issue9115

This gives the following message with the current compiler: foo.d(16): Error: array operation a - b without destination memory not allowed As you say, using a temporary allows it to work. It's a limitation, but not a bug.