diff --git a/llvm/test/CodeGen/AArch64/arm64-rev.ll b/llvm/test/CodeGen/AArch64/arm64-rev.ll
--- a/llvm/test/CodeGen/AArch64/arm64-rev.ll
+++ b/llvm/test/CodeGen/AArch64/arm64-rev.ll
@@ -949,3 +949,24 @@
   %7 = or i64 %5, %6
   ret i64 %7
 }
+
+define i32 @pr55484(i32 %0) {
+; CHECK-LABEL: pr55484:
+; CHECK:       // %bb.0:
+; CHECK-NEXT:    rev w8, w0
+; CHECK-NEXT:    asr w0, w8, #16
+; CHECK-NEXT:    ret
+;
+; GISEL-LABEL: pr55484:
+; GISEL:       // %bb.0:
+; GISEL-NEXT:    lsl w8, w0, #8
+; GISEL-NEXT:    orr w8, w8, w0, lsr #8
+; GISEL-NEXT:    sxth w0, w8
+; GISEL-NEXT:    ret
+  %2 = lshr i32 %0, 8
+  %3 = shl i32 %0, 8
+  %4 = or i32 %2, %3
+  %5 = trunc i32 %4 to i16
+  %6 = sext i16 %5 to i32
+  ret i32 %6
+}
diff --git a/llvm/test/CodeGen/ARM/rev.ll b/llvm/test/CodeGen/ARM/rev.ll
--- a/llvm/test/CodeGen/ARM/rev.ll
+++ b/llvm/test/CodeGen/ARM/rev.ll
@@ -181,3 +181,16 @@
   %conv3 = call i16 @llvm.bswap.i16(i16 %v)
   ret i16 %conv3
 }
+
+define i32 @pr55484(i32 %0) {
+; CHECK-LABEL: pr55484:
+; CHECK:       @ %bb.0:
+; CHECK-NEXT:    revsh r0, r0
+; CHECK-NEXT:    bx lr
+  %2 = lshr i32 %0, 8
+  %3 = shl i32 %0, 8
+  %4 = or i32 %2, %3
+  %5 = trunc i32 %4 to i16
+  %6 = sext i16 %5 to i32
+  ret i32 %6
+}
diff --git a/llvm/test/CodeGen/RISCV/bswap-bitreverse.ll b/llvm/test/CodeGen/RISCV/bswap-bitreverse.ll
--- a/llvm/test/CodeGen/RISCV/bswap-bitreverse.ll
+++ b/llvm/test/CodeGen/RISCV/bswap-bitreverse.ll
@@ -1635,3 +1635,77 @@
   %tmp2 = call i64 @llvm.bswap.i64(i64 %tmp)
   ret i64 %tmp2
 }
+
+define i32 @pr55484(i32 %0) {
+; RV32I-LABEL: pr55484:
+; RV32I:       # %bb.0:
+; RV32I-NEXT:    srli a1, a0, 8
+; RV32I-NEXT:    slli a0, a0, 8
+; RV32I-NEXT:    or a0, a1, a0
+; RV32I-NEXT:    slli a0, a0, 16
+; RV32I-NEXT:    srai a0, a0, 16
+; RV32I-NEXT:    ret
+;
+; RV64I-LABEL: pr55484:
+; RV64I:       # %bb.0:
+; RV64I-NEXT:    srli a1, a0, 8
+; RV64I-NEXT:    slli a0, a0, 8
+; RV64I-NEXT:    or a0, a1, a0
+; RV64I-NEXT:    slli a0, a0, 48
+; RV64I-NEXT:    srai a0, a0, 48
+; RV64I-NEXT:    ret
+;
+; RV32ZBB-LABEL: pr55484:
+; RV32ZBB:       # %bb.0:
+; RV32ZBB-NEXT:    rev8 a0, a0
+; RV32ZBB-NEXT:    srai a0, a0, 16
+; RV32ZBB-NEXT:    ret
+;
+; RV64ZBB-LABEL: pr55484:
+; RV64ZBB:       # %bb.0:
+; RV64ZBB-NEXT:    rev8 a0, a0
+; RV64ZBB-NEXT:    srai a0, a0, 48
+; RV64ZBB-NEXT:    ret
+;
+; RV32ZBKB-LABEL: pr55484:
+; RV32ZBKB:       # %bb.0:
+; RV32ZBKB-NEXT:    srli a1, a0, 8
+; RV32ZBKB-NEXT:    slli a0, a0, 8
+; RV32ZBKB-NEXT:    or a0, a1, a0
+; RV32ZBKB-NEXT:    slli a0, a0, 16
+; RV32ZBKB-NEXT:    srai a0, a0, 16
+; RV32ZBKB-NEXT:    ret
+;
+; RV64ZBKB-LABEL: pr55484:
+; RV64ZBKB:       # %bb.0:
+; RV64ZBKB-NEXT:    srli a1, a0, 8
+; RV64ZBKB-NEXT:    slli a0, a0, 8
+; RV64ZBKB-NEXT:    or a0, a1, a0
+; RV64ZBKB-NEXT:    slli a0, a0, 48
+; RV64ZBKB-NEXT:    srai a0, a0, 48
+; RV64ZBKB-NEXT:    ret
+;
+; RV32ZBP-LABEL: pr55484:
+; RV32ZBP:       # %bb.0:
+; RV32ZBP-NEXT:    srli a1, a0, 8
+; RV32ZBP-NEXT:    slli a0, a0, 8
+; RV32ZBP-NEXT:    or a0, a1, a0
+; RV32ZBP-NEXT:    slli a0, a0, 16
+; RV32ZBP-NEXT:    srai a0, a0, 16
+; RV32ZBP-NEXT:    ret
+;
+; RV64ZBP-LABEL: pr55484:
+; RV64ZBP:       # %bb.0:
+; RV64ZBP-NEXT:    srli a1, a0, 8
+; RV64ZBP-NEXT:    slli a0, a0, 8
+; RV64ZBP-NEXT:    or a0, a1, a0
+; RV64ZBP-NEXT:    slli a0, a0, 48
+; RV64ZBP-NEXT:    srai a0, a0, 48
+; RV64ZBP-NEXT:    ret
+  %2 = lshr i32 %0, 8
+  %3 = shl i32 %0, 8
+  %4 = or i32 %2, %3
+  %5 = trunc i32 %4 to i16
+  %6 = sext i16 %5 to i32
+  ret i32 %6
+}
diff --git a/llvm/test/CodeGen/Thumb/rev.ll b/llvm/test/CodeGen/Thumb/rev.ll
--- a/llvm/test/CodeGen/Thumb/rev.ll
+++ b/llvm/test/CodeGen/Thumb/rev.ll
@@ -63,3 +63,16 @@
   %conv8 = ashr exact i32 %sext, 16
   ret i32 %conv8
 }
+
+define i32 @pr55484(i32 %0) {
+; CHECK-LABEL: pr55484:
+; CHECK:       @ %bb.0:
+; CHECK-NEXT:    revsh r0, r0
+; CHECK-NEXT:    bx lr
+  %2 = lshr i32 %0, 8
+  %3 = shl i32 %0, 8
+  %4 = or i32 %2, %3
+  %5 = trunc i32 %4 to i16
+  %6 = sext i16 %5 to i32
+  ret i32 %6
+}
diff --git a/llvm/test/CodeGen/X86/bswap.ll b/llvm/test/CodeGen/X86/bswap.ll
--- a/llvm/test/CodeGen/X86/bswap.ll
+++ b/llvm/test/CodeGen/X86/bswap.ll
@@ -390,3 +390,25 @@
   ret i528 %Z
 }
 declare i528 @llvm.bswap.i528(i528)
+
+define i32 @pr55484(i32 %0) {
+; CHECK-LABEL: pr55484:
+; CHECK:       # %bb.0:
+; CHECK-NEXT:    movl {{[0-9]+}}(%esp), %eax
+; CHECK-NEXT:    bswapl %eax
+; CHECK-NEXT:    sarl $16, %eax
+; CHECK-NEXT:    retl
+;
+; CHECK64-LABEL: pr55484:
+; CHECK64:       # %bb.0:
+; CHECK64-NEXT:    movl %edi, %eax
+; CHECK64-NEXT:    bswapl %eax
+; CHECK64-NEXT:    sarl $16, %eax
+; CHECK64-NEXT:    retq
+  %2 = lshr i32 %0, 8
+  %3 = shl i32 %0, 8
+  %4 = or i32 %2, %3
+  %5 = trunc i32 %4 to i16
+  %6 = sext i16 %5 to i32
+  ret i32 %6
+}