[flang-commits] [compiler-rt] [flang] [llvm] [AArch64] fix trampoline implementation: use X15 (PR #126743)

[Jameson Nash via flang-commits]

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@@ -20903,7 +20903,12 @@ sufficiently aligned block of memory; this memory is written to by the
 intrinsic. Note that the size and the alignment are target-specific -
 LLVM currently provides no portable way of determining them, so a
 front-end that generates this intrinsic needs to have some
-target-specific knowledge. The ``func`` argument must hold a function.
+target-specific knowledge.
+
+The ``func`` argument must be a constant (potentially bitcasted) pointer to a
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vtjnash wrote:

It probably isn't of much relevance since opaque pointers. I think it is just also fairly silly of a restriction, since llvm doesn't care at all about the source of the value here, it just needs to know what calling convention it should have (to know which register to use). That info probably could just as easily be passed as a separate immarg value, since calling conventions are defined in the langref to be numeric.

https://github.com/llvm/llvm-project/pull/126743