================
@@ -21,6 +21,12 @@ char f_int_4(char x) { return x; }
// CHECK-LABEL: define{{.*}} fp128 @f_ld(fp128 noundef %x)
long double f_ld(long double x) { return x; }
+// Empty struct is lowered as a placeholder word parameter.
+struct empty {};
+
+// CHECK-LABEL: define{{.*}} i64 @f_empty(i64 %x.coerce)
+struct empty f_empty(struct empty x) { return x; }
+
----------------
koachan wrote:
It appears to match GCC's behavior, yes.
As for tests, would something like
[this](https://github.com/llvm/llvm-project/pull/90338/files#diff-c3d7a0e691e2cd679ffeaec76d9ccb0626e21d24e9e07dd84260f22d438d2b99)
be enough?
https://github.com/llvm/llvm-project/pull/90338
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