https://gcc.gnu.org/bugzilla/show_bug.cgi?id=72819
Bug ID: 72819
Summary: [AArch64] HFA structs of __fp16 incorrectly passed to
functions
Product: gcc
Version: 6.2.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: target
Assignee: jgreenhalgh at gcc dot gnu.org
Reporter: jgreenhalgh at gcc dot gnu.org
Target Milestone: ---
Target: aarch64*-*-*
It looks like we've not been handling structures of 16-bit floating-point
data correctly for AArch64. For some reason we end up passing them
packed in to integer registers. That is to say, on trunk and GCC 6, for:
struct x {
__fp16 x[4];
};
__fp16
foo1 (struct x x)
{
return x.x[1];
}
We generate:
foo1:
sbfx x0, x0, 16, 16
mov v0.h[0], w0
ret
Which is wrong. The structure should have been passed in h0,h1,h2,h3, and foo1
should just have been a move and a return.
