[all-commits] [llvm/llvm-project] a4796b: [ARM] Emit error message when incompatible reg is ...

[eleviant via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: a4796b14fcf3bf2749dcb90b5c870140f1a82f78
      https://github.com/llvm/llvm-project/commit/a4796b14fcf3bf2749dcb90b5c870140f1a82f78
  Author: eleviant <56861949+eleviant at users.noreply.github.com>
  Date:   2025-07-24 (Thu, 24 Jul 2025)

  Changed paths:
    M llvm/lib/Target/ARM/ARMISelLowering.cpp
    A llvm/test/CodeGen/ARM/bad-constraint.ll
    A llvm/test/CodeGen/ARM/inlineasm-int-to-float.ll

  Log Message:
  -----------
  [ARM] Emit error message when incompatible reg is specified (#147559)

At the moment the following piece of code causes undefined behavior:
```
int a;
void b() {
   register float d2 asm("d2") = a;
   asm("" ::"r"(d2));
}
```
This happens because variable and register types are incompatible.



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