[clang] [inline-asm] Fixed issue no. 164973 (PR #167316)

[Eli Friedman via cfe-commits]

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@@ -0,0 +1,23 @@
+/// Test that inline asm source location corresponds to the actual
+/// instruction line, not the first line of the asm block.
+///
+/// RUN: not %clang_cc1 -triple x86_64-pc-linux-gnu -emit-obj %s 2>&1 | FileCheck %s
+
+// #include <stdint.h>
+// #include <string.h>
+
+void *memset(void *dest, int c, int n)__attribute__((naked));
+void *memset(void *dest, int c, int n) {
+    __asm__(
+        "\t"            // <-- line with only a tab
+        "xchg %eax, %eax\n" // <-- A valid instruction
+        "\t"            // <-- line with only a tab
+        "mov rdi, 1\n"  // <-- An invalid instruction
+    );
+}
+
+int main() { return 0; }
+
+// CHECK: error: unknown use of instruction mnemonic
+// CHECK-NEXT: mov rdi, 1
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efriedma-quic wrote:

The CHECK lines here don't seem to actually check the line numbers.

https://github.com/llvm/llvm-project/pull/167316