c187122531
A symbol operand (constraint "s") feeds a function/global symbol whose mangled name the template emits — enabling a DIRECT `bl %[fn]` (one fewer indirection than register-indirect `blr`). Until now `"s" = fn` fell through to emit and produced an LLVM-verifier crash (param type mismatch). Reject it at lowering with a clear diagnostic instead, and lock that with examples/1656-platform-asm-symbol-operand.sx. The next commit implements it and flips the example to run (→ 42).
30 lines
948 B
Plaintext
30 lines
948 B
Plaintext
error: symbol asm operands (`"s"`) are not yet implemented
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--> examples/1656-platform-asm-symbol-operand.sx:10:12
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10 | return asm volatile {
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| ^^^^^^^^^^^^^^
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11 | #string ASM
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| ^^^^^^^^^^^^^^^^^^^
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12 | stp x29, x30, [sp, #-16]!
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| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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13 | mov x0, %[arg]
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| ^^^^^^^^^^^^^^^^^^^^^^
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14 | bl %[fn]
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| ^^^^^^^^^^^^^^^^
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15 | mov %[res], x0
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| ^^^^^^^^^^^^^^^^^^^^^^
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16 | ldp x29, x30, [sp], #16
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| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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17 | ASM,
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| ^^^^
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18 | [res] "=r" -> i64,
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| ^^^^^^^^^^^^^^^^^^^^^^^^^^
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19 | [arg] "r" = n,
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| ^^^^^^^^^^^^^^^^^^^^^^
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20 | [fn] "s" = cb, // symbol operand → direct `bl _cb`
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| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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21 | clobbers(.x0, .x30, .memory),
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| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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22 | };
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| ^^^^^
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