diff --git a/llvm/lib/Target/LoongArch/MCTargetDesc/LoongArchAsmBackend.cpp b/llvm/lib/Target/LoongArch/MCTargetDesc/LoongArchAsmBackend.cpp
--- a/llvm/lib/Target/LoongArch/MCTargetDesc/LoongArchAsmBackend.cpp
+++ b/llvm/lib/Target/LoongArch/MCTargetDesc/LoongArchAsmBackend.cpp
@@ -89,21 +89,24 @@
     return Value;
   case LoongArch::fixup_loongarch_b16: {
     if (!isInt<18>(Value))
-      Ctx.reportError(Fixup.getLoc(), "fixup value out of range");
+      Ctx.reportError(Fixup.getLoc(),
+                      "fixup value out of range represented by 18 bit");
     if (Value % 4)
       Ctx.reportError(Fixup.getLoc(), "fixup value must be 4-byte aligned");
     return (Value >> 2) & 0xffff;
   }
   case LoongArch::fixup_loongarch_b21: {
     if (!isInt<23>(Value))
-      Ctx.reportError(Fixup.getLoc(), "fixup value out of range");
+      Ctx.reportError(Fixup.getLoc(),
+                      "fixup value out of range represented by 23 bit");
     if (Value % 4)
       Ctx.reportError(Fixup.getLoc(), "fixup value must be 4-byte aligned");
     return ((Value & 0x3fffc) << 8) | ((Value >> 18) & 0x1f);
   }
   case LoongArch::fixup_loongarch_b26: {
     if (!isInt<28>(Value))
-      Ctx.reportError(Fixup.getLoc(), "fixup value out of range");
+      Ctx.reportError(Fixup.getLoc(),
+                      "fixup value out of range represented by 28 bit");
     if (Value % 4)
       Ctx.reportError(Fixup.getLoc(), "fixup value must be 4-byte aligned");
     return ((Value & 0x3fffc) << 8) | ((Value >> 18) & 0x3ff);
diff --git a/llvm/test/MC/LoongArch/Relocations/fixups-diagnostics.s b/llvm/test/MC/LoongArch/Relocations/fixups-diagnostics.s
--- a/llvm/test/MC/LoongArch/Relocations/fixups-diagnostics.s
+++ b/llvm/test/MC/LoongArch/Relocations/fixups-diagnostics.s
@@ -9,12 +9,12 @@
   .byte 0
   .byte 0
 
-  beq $a0, $a1, out_of_range_b16 # CHECK: :[[#@LINE]]:3: error: fixup value out of range
+  beq $a0, $a1, out_of_range_b18 # CHECK: :[[#@LINE]]:3: error: fixup value out of range range represented by 18 bit
   .space 1<<18
-out_of_range_b16:
-  beqz $a0, out_of_range_b21 # CHECK: :[[#@LINE]]:3: error: fixup value out of range
+out_of_range_b18:
+  beqz $a0, out_of_range_b23 # CHECK: :[[#@LINE]]:3: error: fixup value out of range range represented by 23 bit
   .space 1<<23
-out_of_range_b21:
-  b out_of_range_b26 # CHECK: :[[#@LINE]]:3: error: fixup value out of range
+out_of_range_b23:
+  b out_of_range_b28 # CHECK: :[[#@LINE]]:3: error: fixup value out of range represented by 28 bit
   .space 1<<28
-out_of_range_b26:
+out_of_range_b28: