aarch64: Fix up __aarch64_cas16_acq_rel fallback
As mentioned in the PR, the fallback path when LSE is unavailable writes incorrect registers to the memory if the previous content compares equal to x0, x1 - it writes copy of x0, x1 from the start of function, but it should write x2, x3. 2020-08-03 Jakub Jelinek <jakub@redhat.com> PR target/96402 * config/aarch64/lse.S (__aarch64_cas16_acq_rel): Use x2, x3 instead of x(tmp0), x(tmp1) in STXP arguments. * gcc.target/aarch64/pr96402.c: New test.
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@ -0,0 +1,16 @@
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/* PR target/96402 */
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/* { dg-do run { target int128 } } */
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/* { dg-options "-moutline-atomics" } */
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int
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main ()
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{
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__int128 a = 0;
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__sync_val_compare_and_swap (&a, (__int128) 0, (__int128) 1);
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if (a != 1)
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__builtin_abort ();
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__sync_val_compare_and_swap (&a, (__int128) 1, (((__int128) 0xdeadbeeffeedbac1ULL) << 64) | 0xabadcafe00c0ffeeULL);
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if (a != ((((__int128) 0xdeadbeeffeedbac1ULL) << 64) | 0xabadcafe00c0ffeeULL))
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__builtin_abort ();
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return 0;
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}
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@ -203,7 +203,7 @@ STARTFN NAME(cas)
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cmp x0, x(tmp0)
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ccmp x1, x(tmp1), #0, eq
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bne 1f
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STXP w(tmp2), x(tmp0), x(tmp1), [x4]
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STXP w(tmp2), x2, x3, [x4]
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cbnz w(tmp2), 0b
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1: ret
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