================
@@ -45,7 +45,7 @@ void test3(packedfloat3 *p) {
*p = (packedfloat3) { 3.2f, 2.3f, 0.1f };
}
// CHECK: @test3(
-// CHECK: store <4 x float> {{.*}}, align 4
+// CHECK: store <3 x float> {{.*}}, align 4
----------------
efriedma-quic wrote:
On targets with SIMD vectors (basically any modern CPU target), a 12-byte store
is going to be slower than a 16-byte store, so we don't want to generate a
12-byte store. So clang has an ABI rule that says we can generate a 16-byte
store instead.
If you have some target that actually wants 12-byte stores for some reason, it
needs to be a target-specific ABI rule in clang: on that target, we just
directly generate 12-byte stores, instead of 16-byte stores.
https://github.com/llvm/llvm-project/pull/104661
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