| Issue |
152165
|
| Summary |
aarch64: Failure to handle PSTATE.SM & ZA for tlsdesc calls
|
| Labels |
new issue
|
| Assignees |
|
| Reporter |
pinskia
|
Turns out LLVM has the same issue as GCC here (https://gcc.gnu.org/bugzilla/show_bug.cgi?id=121415).
For:
```
extern __thread int x;
int f() __arm_streaming_compatible { return x; }
```
compiled with -O2 -fPIC, we get:
```
f(): // @f()
.cfi_startproc
// %bb.0:
stp x29, x30, [sp, #-16]! // 16-byte Folded Spill
.cfi_def_cfa_offset 16
mov x29, sp
.cfi_def_cfa w29, 16
.cfi_offset w30, -8
.cfi_offset w29, -16
adrp x0, :tlsdesc:x
ldr x1, [x0, :tlsdesc_lo12:x]
add x0, x0, :tlsdesc_lo12:x
.tlsdesccall x
blr x1
mrs x8, TPIDR_EL0
ldr w0, [x8, x0]
.cfi_def_cfa wsp, 16
ldp x29, x30, [sp], #16 // 16-byte Folded Reload
.cfi_def_cfa_offset 0
.cfi_restore w30
.cfi_restore w29
ret
```
which fails to force non-streaming mode around the call. A function with ZA or ZT0 state would also need to handle that.
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