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diff --git a/test/MC/ARM/invalid-instructions-spellcheck.s b/test/MC/ARM/invalid-instructions-spellcheck.s
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+++ b/test/MC/ARM/invalid-instructions-spellcheck.s
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+@ RUN: not llvm-mc -triple=arm -show-encoding < %s 2>&1 | FileCheck %s
+@ RUN: not llvm-mc -triple=thumb -show-encoding < %s 2>&1 | FileCheck %s --check-prefix=CHECK-THUMB
+
+@ This tests the mnemonic spell checker.
+
+@ First check what happens when an instruction is omitted:
+
+  r1, r2, r3
+
+@ CHECK:      error: unexpected token in operand
+@ CHECK-NEXT: r1, r2, r3
+@ CHECK-NEXT:   ^
+
+@ We don't want to see a suggestion here; the edit distance is too large to
+@ give sensible suggestions:
+
+  aaaaaaaaaaaaaaa r1, r2, r3
+
+@ CHECK:      error: invalid instruction
+@ CHECK-NEXT: aaaaaaaaaaaaaaa r1, r2, r3
+@ CHECK-NEXT: ^
+
+@ Check that we get one suggestion: 'pushh' is 1 edit away, i.e. an deletion.
+
+  pushh r1, r2, r3
+
+@CHECK:      error: invalid instruction, did you mean: push?
+@CHECK-NEXT: pushh r1, r2, r3
+@CHECK-NEXT: ^
+
+  adXd r1, r2, r3
+
+@ Check edit distance 1 and 2: 'add' has edit distance of 1 (a deletion),
+@ and 'qadd' a distance of 2 (a deletion and an insertion)
+
+@ CHECK:      error: invalid instruction, did you mean: add, qadd?
+@ CHECK-NEXT: adXd r1, r2, r3
+@ CHECK-NEXT: ^
+
+@ Check edit distance 1 and 2, just insertions:
+
+  ad r1, r2, r3
+
+@ CHECK:      error: invalid instruction, did you mean: adc, add, adr, and, qadd?
+@ CHECK-NEXT: ad r1, r2, r3
+@ CHECK-NEXT: ^
+
+@ Check an instruction that is 2 edits away, and also has a lot of candidates:
+
+  ldre r1, r2, r3
+
+@ CHECK:      error: invalid instruction, did you mean: ldr, ldrb, ldrd, ldrex, ldrexb, ldrexd, ldrexh, ldrh, ldrt?
+@ CHECK-NEXT: ldre r1, r2, r3
+@ CHECK-NEXT: ^
+
+@ Here it is checked that we don't suggest instructions that are not supported.
+@ For example, in Thumb mode we don't want to see suggestions 'faddd' of 'qadd'
+@ because they are not supported.
+
+  fadd r1, r2, r3
+
+@ CHECK-THUMB: error: invalid instruction, did you mean: add?
+@ CHECK-THUMB: fadd r1, r2, r3
+@ CHECK-THUMB: ^
+
+@ CHECK:      error: invalid instruction, did you mean: add, qadd?
+@ CHECK-NEXT: fadd r1, r2, r3
+@ CHECK-NEXT: ^