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diff --git a/llvm/test/MC/Disassembler/AArch64/a64-ignored-fields.txt b/llvm/test/MC/Disassembler/AArch64/a64-ignored-fields.txt
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index 00000000000..966530d36a3
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+++ b/llvm/test/MC/Disassembler/AArch64/a64-ignored-fields.txt
@@ -0,0 +1,8 @@
+# RUN: llvm-mc -triple=aarch64 -disassemble -show-encoding < %s | FileCheck %s
+
+# The "Rm" bits are ignored, but the canonical representation has them filled
+# with 0s. This is what we should produce even if the input bit-pattern had
+# something else there.
+
+# CHECK: fcmp s31, #0.0 // encoding: [0xe8,0x23,0x20,0x1e]
+0xe8 0x23 0x33 0x1e
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