https://bugs.llvm.org/show_bug.cgi?id=36345
Bug ID: 36345
Summary: [AArch64][GlobalISel] struct passing with fp16 members
Product: new-bugs
Version: trunk
Hardware: PC
OS: Linux
Status: NEW
Severity: enhancement
Priority: P
Component: new bugs
Assignee: unassignedb...@nondot.org
Reporter: sjoerd.mei...@arm.com
CC: llvm-bugs@lists.llvm.org
Compilation of this:
typedef struct {
__fp16 array[2];
} struct2;
struct2 global_arg0;
void c_test(struct2 arg0) {
global_arg0 = arg0;
}
fails with:
unimplemented reg-to-reg copy
UNREACHABLE executed at
/data/llvmdev/llvm/lib/Target/AArch64/AArch64InstrInfo.cpp:2573!
when e.g. compiled with:
-O0 --target=aarch64-arm-none-eabi -march=armv8-a+simd+fp bug.c -S
Looks like GISel is generating a COPY node:
bb.1.entry:
liveins: $h0, $h1
renamable $x8 = IMPLICIT_DEF
renamable $w9 = COPY killed renamable $h0
...
but this is trying to copy from a 16-bit to a 32-bit register (and COPY works
with equal sized source/destination registers?).
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