================
@@ -0,0 +1,21 @@
+; RUN: not llc -filetype=null -mtriple=x86_64-unknown-unknown %s 2>&1 |
FileCheck %s
+
+; GH225033: {flags} is only valid as a clobber.
+
+; CHECK: error: could not allocate output register for constraint '{flags}'
----------------
akash-manna-sky wrote:
I don't think so. Sema only covers Clang's register variables; the constraint
can also come straight from IR, and `={flags}` with an `i32` still dies with
`Unable to copy EFLAGS physical register!` — EFLAGS can't be copied at all, so
there is no value type for which it could work. The gate just makes `{flags}`
behave like `{dirflag}` and `{fpsr}` below it.
https://github.com/llvm/llvm-project/pull/227576
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