Imported Upstream version 5.18.0.179

Former-commit-id: 67aa10e65b237e1c4537630979ee99ebe1374215

external/llvm/test/MC/Mips/mips-noat.s

@@ -0,0 +1,33 @@
+# RUN: not llvm-mc %s -triple=mips-unknown-linux 2>%t0 | FileCheck %s
+# RUN: FileCheck -check-prefix=ERROR %s < %t0
+# Check that using the assembler temporary when .set noat is in effect is an error.
+
+# We start with the assembler temporary enabled
+# CHECK-LABEL: test1:
+# CHECK:  lui   $1, 1
+# CHECK:  addu  $1, $1, $2
+# CHECK:  lw    $2, 0($1)
+# CHECK-LABEL: test2:
+# CHECK:  .set noat
+test1:
+        lw      $2, 65536($2)
+
+test2:
+        .set noat
+        lw      $2, 65536($2) # ERROR: mips-noat.s:[[@LINE]]:9: error: pseudo-instruction requires $at, which is not available
+
+
+# Can we switch it back on successfully?
+# CHECK-LABEL: test3:
+# CHECK:  lui   $1, 1
+# CHECK:  addu  $1, $1, $2
+# CHECK:  lw    $2, 0($1)
+# CHECK-LABEL: test4:
+# CHECK:  .set  at=$0
+test3:
+        .set at
+        lw      $2, 65536($2)
+
+test4:
+        .set at=$0
+        lw      $2, 65536($2) # ERROR: mips-noat.s:[[@LINE]]:9: error: pseudo-instruction requires $at, which is not available