diff --git a/clang/include/clang/Basic/DiagnosticDriverKinds.td b/clang/include/clang/Basic/DiagnosticDriverKinds.td
--- a/clang/include/clang/Basic/DiagnosticDriverKinds.td
+++ b/clang/include/clang/Basic/DiagnosticDriverKinds.td
@@ -728,6 +728,9 @@
 def err_drv_riscv_unsupported_with_linker_relaxation : Error<
   "%0 is unsupported with RISC-V linker relaxation (-mrelax)">;
 
+def warn_drv_loongarch_conflicting_implied_val : Warning<
+  "ignoring '%0' as it conflicts with that implied by '%1' (%2)">,
+  InGroup<OptionIgnored>;
 def err_drv_loongarch_invalid_mfpu_EQ : Error<
   "invalid argument '%0' to -mfpu=; must be one of: 64, 32, none, 0 (alias for none)">;
 
diff --git a/clang/lib/Driver/ToolChains/Arch/LoongArch.cpp b/clang/lib/Driver/ToolChains/Arch/LoongArch.cpp
--- a/clang/lib/Driver/ToolChains/Arch/LoongArch.cpp
+++ b/clang/lib/Driver/ToolChains/Arch/LoongArch.cpp
@@ -26,32 +26,75 @@
          "Unexpected triple");
   bool IsLA32 = Triple.getArch() == llvm::Triple::loongarch32;
 
+  // Record -mabi value for later use.
+  const Arg *MABIArg = Args.getLastArg(options::OPT_mabi_EQ);
+  StringRef MABIValue;
+  if (MABIArg) {
+    MABIValue = MABIArg->getValue();
+  }
+
+  // Parse -mfpu value for later use.
+  const Arg *MFPUArg = Args.getLastArg(options::OPT_mfpu_EQ);
+  int FPU = -1;
+  if (MFPUArg) {
+    StringRef V = MFPUArg->getValue();
+    if (V == "64")
+      FPU = 64;
+    else if (V == "32")
+      FPU = 32;
+    else if (V == "0" || V == "none")
+      FPU = 0;
+    else
+      D.Diag(diag::err_drv_loongarch_invalid_mfpu_EQ) << V;
+  }
+
   // Check -m*-float firstly since they have highest priority.
   if (const Arg *A = Args.getLastArg(options::OPT_mdouble_float,
                                      options::OPT_msingle_float,
                                      options::OPT_msoft_float)) {
-    if (A->getOption().matches(options::OPT_mdouble_float))
-      return IsLA32 ? "ilp32d" : "lp64d";
-    if (A->getOption().matches(options::OPT_msingle_float))
-      return IsLA32 ? "ilp32f" : "lp64f";
-    if (A->getOption().matches(options::OPT_msoft_float))
-      return IsLA32 ? "ilp32s" : "lp64s";
+    StringRef ImpliedABI;
+    int ImpliedFPU = -1;
+    if (A->getOption().matches(options::OPT_mdouble_float)) {
+      ImpliedABI = IsLA32 ? "ilp32d" : "lp64d";
+      ImpliedFPU = 64;
+    }
+    if (A->getOption().matches(options::OPT_msingle_float)) {
+      ImpliedABI = IsLA32 ? "ilp32f" : "lp64f";
+      ImpliedFPU = 32;
+    }
+    if (A->getOption().matches(options::OPT_msoft_float)) {
+      ImpliedABI = IsLA32 ? "ilp32s" : "lp64s";
+      ImpliedFPU = 0;
+    }
+
+    // Check `-mabi=` and `-mfpu=` settings and report if they conflict with
+    // the higher-priority settings implied by -m*-float.
+    //
+    // ImpliedABI and ImpliedFPU are guaranteed to have valid values because
+    // one of the match arms must match if execution can arrive here at all.
+    if (!MABIValue.empty() && ImpliedABI != MABIValue)
+      D.Diag(diag::warn_drv_loongarch_conflicting_implied_val)
+          << MABIArg->getAsString(Args) << A->getAsString(Args) << ImpliedABI;
+
+    if (FPU != -1 && ImpliedFPU != FPU)
+      D.Diag(diag::warn_drv_loongarch_conflicting_implied_val)
+          << MFPUArg->getAsString(Args) << A->getAsString(Args) << ImpliedFPU;
+
+    return ImpliedABI;
   }
 
   // If `-mabi=` is specified, use it.
-  if (const Arg *A = Args.getLastArg(options::OPT_mabi_EQ))
-    return A->getValue();
+  if (!MABIValue.empty())
+    return MABIValue;
 
   // Select abi based on -mfpu=xx.
-  if (const Arg *A = Args.getLastArg(options::OPT_mfpu_EQ)) {
-    StringRef FPU = A->getValue();
-    if (FPU == "64")
-      return IsLA32 ? "ilp32d" : "lp64d";
-    if (FPU == "32")
-      return IsLA32 ? "ilp32f" : "lp64f";
-    if (FPU == "0" || FPU == "none")
-      return IsLA32 ? "ilp32s" : "lp64s";
-    D.Diag(diag::err_drv_loongarch_invalid_mfpu_EQ) << FPU;
+  switch (FPU) {
+  case 64:
+    return IsLA32 ? "ilp32d" : "lp64d";
+  case 32:
+    return IsLA32 ? "ilp32f" : "lp64f";
+  case 0:
+    return IsLA32 ? "ilp32s" : "lp64s";
   }
 
   // Choose a default based on the triple.
diff --git a/clang/test/Driver/loongarch-mdouble-float.c b/clang/test/Driver/loongarch-mdouble-float.c
--- a/clang/test/Driver/loongarch-mdouble-float.c
+++ b/clang/test/Driver/loongarch-mdouble-float.c
@@ -1,12 +1,18 @@
 // RUN: %clang --target=loongarch64 -mdouble-float -fsyntax-only %s -### 2>&1 | \
 // RUN:   FileCheck %s --check-prefix=CC1
+// RUN: %clang --target=loongarch64 -mdouble-float -mfpu=64 -mabi=lp64d -fsyntax-only %s -### 2>&1 | \
+// RUN:   FileCheck %s --check-prefixes=CC1,NOWARN
 // RUN: %clang --target=loongarch64 -mdouble-float -mfpu=0 -mabi=lp64s -fsyntax-only %s -### 2>&1 | \
-// RUN:   FileCheck %s --check-prefixes=CC1,WARN
+// RUN:   FileCheck %s --check-prefixes=CC1,WARN,WARN-FPU0
+// RUN: %clang --target=loongarch64 -mdouble-float -mfpu=none -mabi=lp64s -fsyntax-only %s -### 2>&1 | \
+// RUN:   FileCheck %s --check-prefixes=CC1,WARN,WARN-FPUNONE
 // RUN: %clang --target=loongarch64 -mdouble-float -S -emit-llvm %s -o - | \
 // RUN:   FileCheck %s --check-prefix=IR
 
-// WARN: warning: argument unused during compilation: '-mfpu=0'
-// WARN: warning: argument unused during compilation: '-mabi=lp64s'
+// NOWARN-NOT: warning:
+// WARN: warning: ignoring '-mabi=lp64s' as it conflicts with that implied by '-mdouble-float' (lp64d)
+// WARN-FPU0: warning: ignoring '-mfpu=0' as it conflicts with that implied by '-mdouble-float' (64)
+// WARN-FPUNONE: warning: ignoring '-mfpu=none' as it conflicts with that implied by '-mdouble-float' (64)
 
 // CC1: "-target-feature" "+f"{{.*}} "-target-feature" "+d"
 // CC1: "-target-abi" "lp64d"
diff --git a/clang/test/Driver/loongarch-msingle-float.c b/clang/test/Driver/loongarch-msingle-float.c
--- a/clang/test/Driver/loongarch-msingle-float.c
+++ b/clang/test/Driver/loongarch-msingle-float.c
@@ -1,12 +1,15 @@
 // RUN: %clang --target=loongarch64 -msingle-float -fsyntax-only %s -### 2>&1 | \
 // RUN:   FileCheck %s --check-prefix=CC1
-// RUN: %clang --target=loongarch64 -msingle-float -mfpu=0 -mabi=lp64s -fsyntax-only %s -### 2>&1 | \
+// RUN: %clang --target=loongarch64 -msingle-float -mfpu=32 -mabi=lp64f -fsyntax-only %s -### 2>&1 | \
+// RUN:   FileCheck %s --check-prefixes=CC1,NOWARN
+// RUN: %clang --target=loongarch64 -msingle-float -mfpu=64 -mabi=lp64s -fsyntax-only %s -### 2>&1 | \
 // RUN:   FileCheck %s --check-prefixes=CC1,WARN
 // RUN: %clang --target=loongarch64 -msingle-float -S -emit-llvm %s -o - | \
 // RUN:   FileCheck %s --check-prefix=IR
 
-// WARN: warning: argument unused during compilation: '-mfpu=0'
-// WARN: warning: argument unused during compilation: '-mabi=lp64s'
+// NOWARN-NOT: warning:
+// WARN: warning: ignoring '-mabi=lp64s' as it conflicts with that implied by '-msingle-float' (lp64f)
+// WARN: warning: ignoring '-mfpu=64' as it conflicts with that implied by '-msingle-float' (32)
 
 // CC1: "-target-feature" "+f"{{.*}} "-target-feature" "-d"
 // CC1: "-target-abi" "lp64f"
diff --git a/clang/test/Driver/loongarch-msoft-float.c b/clang/test/Driver/loongarch-msoft-float.c
--- a/clang/test/Driver/loongarch-msoft-float.c
+++ b/clang/test/Driver/loongarch-msoft-float.c
@@ -1,12 +1,15 @@
 // RUN: %clang --target=loongarch64 -msoft-float -fsyntax-only %s -### 2>&1 | \
 // RUN:   FileCheck %s --check-prefix=CC1
+// RUN: %clang --target=loongarch64 -msoft-float -mfpu=0 -mabi=lp64s -fsyntax-only %s -### 2>&1 | \
+// RUN:   FileCheck %s --check-prefixes=CC1,NOWARN
 // RUN: %clang --target=loongarch64 -msoft-float -mfpu=64 -mabi=lp64d -fsyntax-only %s -### 2>&1 | \
 // RUN:   FileCheck %s --check-prefixes=CC1,WARN
 // RUN: %clang --target=loongarch64 -msoft-float -S -emit-llvm %s -o - | \
 // RUN:   FileCheck %s --check-prefix=IR
 
-// WARN: warning: argument unused during compilation: '-mfpu=64'
-// WARN: warning: argument unused during compilation: '-mabi=lp64d'
+// NOWARN-NOT: warning:
+// WARN: warning: ignoring '-mabi=lp64d' as it conflicts with that implied by '-msoft-float' (lp64s)
+// WARN: warning: ignoring '-mfpu=64' as it conflicts with that implied by '-msoft-float' (0)
 
 // CC1: "-target-feature" "-f"{{.*}} "-target-feature" "-d"
 // CC1: "-target-abi" "lp64s"