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
@@ -77,6 +77,11 @@
   return Infos[Kind - FirstTargetFixupKind];
 }
 
+static void reportOutOfRangeError(MCContext &Ctx, SMLoc Loc, unsigned N) {
+  Ctx.reportError(Loc, "fixup value out of range [" + Twine(llvm::minIntN(N)) +
+                           ", " + Twine(llvm::maxIntN(N)) + "]");
+}
+
 static uint64_t adjustFixupValue(const MCFixup &Fixup, uint64_t Value,
                                  MCContext &Ctx) {
   switch (Fixup.getTargetKind()) {
@@ -89,21 +94,21 @@
     return Value;
   case LoongArch::fixup_loongarch_b16: {
     if (!isInt<18>(Value))
-      Ctx.reportError(Fixup.getLoc(), "fixup value out of range");
+      reportOutOfRangeError(Ctx, Fixup.getLoc(), 18);
     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");
+      reportOutOfRangeError(Ctx, Fixup.getLoc(), 23);
     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");
+      reportOutOfRangeError(Ctx, Fixup.getLoc(), 28);
     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 [-131072, 131071]
   .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 [-4194304, 4194303]
   .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 [-134217728, 134217727]
   .space 1<<28
-out_of_range_b26:
+out_of_range_b28: