diff --git a/clang/include/clang/Driver/Options.td b/clang/include/clang/Driver/Options.td
--- a/clang/include/clang/Driver/Options.td
+++ b/clang/include/clang/Driver/Options.td
@@ -4184,6 +4184,7 @@
 def mno_x87 : Flag<["-"], "mno-x87">, Group<m_x86_Features_Group>;
 def m80387 : Flag<["-"], "m80387">, Alias<mx87>;
 def mno_80387 : Flag<["-"], "mno-80387">, Alias<mno_x87>;
+def mno_fp_ret_in_387 : Flag<["-"], "mno-fp-ret-in-387">, Alias<mno_x87>;
 def mmmx : Flag<["-"], "mmmx">, Group<m_x86_Features_Group>;
 def mno_mmx : Flag<["-"], "mno-mmx">, Group<m_x86_Features_Group>;
 def m3dnow : Flag<["-"], "m3dnow">, Group<m_x86_Features_Group>;
diff --git a/clang/test/Driver/x86-target-features.c b/clang/test/Driver/x86-target-features.c
--- a/clang/test/Driver/x86-target-features.c
+++ b/clang/test/Driver/x86-target-features.c
@@ -2,6 +2,7 @@
 // RUN: %clang -target i386-unknown-linux-gnu -march=i386 -mno-x87 %s -### -o %t.o 2>&1 | FileCheck -check-prefix=NO-X87 %s
 // RUN: %clang -target i386-unknown-linux-gnu -march=i386 -m80387 %s -### -o %t.o 2>&1 | FileCheck -check-prefix=X87 %s
 // RUN: %clang -target i386-unknown-linux-gnu -march=i386 -mno-80387 %s -### -o %t.o 2>&1 | FileCheck -check-prefix=NO-X87 %s
+// RUN: %clang -target i386-unknown-linux-gnu -march=i386 -mno-fp-ret-in-387 %s -### -o %t.o 2>&1 | FileCheck -check-prefix=NO-X87 %s
 // X87: "-target-feature" "+x87"
 // NO-X87: "-target-feature" "-x87"
 
diff --git a/llvm/lib/Target/X86/X86CallingConv.td b/llvm/lib/Target/X86/X86CallingConv.td
--- a/llvm/lib/Target/X86/X86CallingConv.td
+++ b/llvm/lib/Target/X86/X86CallingConv.td
@@ -273,7 +273,10 @@
   // conv.
   CCIfInReg<CCIfSubtarget<"hasSSE2()",
     CCIfType<[f32, f64], CCAssignToReg<[XMM0,XMM1,XMM2]>>>>,
-  CCIfType<[f32,f64], CCAssignToReg<[FP0, FP1]>>,
+  CCIfSubtarget<"hasX87()",
+    CCIfType<[f32, f64], CCAssignToReg<[FP0, FP1]>>>,
+  CCIfNotSubtarget<"hasX87()",
+    CCIfType<[f32], CCAssignToReg<[EAX, EDX, ECX]>>>,
   CCIfType<[f16], CCAssignToReg<[XMM0,XMM1,XMM2]>>,
   CCDelegateTo<RetCC_X86Common>
 ]>;
diff --git a/llvm/lib/Target/X86/X86ISelLowering.cpp b/llvm/lib/Target/X86/X86ISelLowering.cpp
--- a/llvm/lib/Target/X86/X86ISelLowering.cpp
+++ b/llvm/lib/Target/X86/X86ISelLowering.cpp
@@ -2371,6 +2371,11 @@
   if (VT == MVT::v3f16 && Subtarget.hasFP16())
     return MVT::v8f16;
 
+  // We will use more GPRs for f64 and f80 on 32 bits when x87 is disabled.
+  if ((VT == MVT::f64 || VT == MVT::f80) && !Subtarget.is64Bit() &&
+      !Subtarget.hasX87())
+    return MVT::i32;
+
   return TargetLowering::getRegisterTypeForCallingConv(Context, CC, VT);
 }
 
@@ -2394,6 +2399,15 @@
   if (VT == MVT::v3f16 && Subtarget.hasFP16())
     return 1;
 
+  // We have to split f64 to 2 registers and f80 to 3 registers on 32 bits if
+  // x87 is disabled.
+  if (!Subtarget.is64Bit() && !Subtarget.hasX87()) {
+    if (VT == MVT::f64)
+      return 2;
+    if (VT == MVT::f80)
+      return 3;
+  }
+
   return TargetLowering::getNumRegistersForCallingConv(Context, CC, VT);
 }
 
diff --git a/llvm/test/CodeGen/X86/no-ret-in-x87-reg.ll b/llvm/test/CodeGen/X86/no-ret-in-x87-reg.ll
new file mode 100644
--- /dev/null
+++ b/llvm/test/CodeGen/X86/no-ret-in-x87-reg.ll
@@ -0,0 +1,193 @@
+; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
+; RUN: llc < %s -mtriple=i686-- | FileCheck %s -check-prefix=X87
+; RUN: llc < %s -mtriple=i686-- -mattr=-x87 | FileCheck %s -check-prefixes=NOX87,NOSSE-NOX87
+; RUN: llc < %s -mtriple=i686-- -mattr=-x87,-sse2 | FileCheck %s -check-prefixes=NOX87,NOSSE-NOX87
+; RUN: llc < %s -mtriple=i686-- -mattr=-x87,+sse2 | FileCheck %s -check-prefixes=NOX87,SSE-NOX87
+
+define float @f1(float %a, float %b) nounwind {
+; X87-LABEL: f1:
+; X87:       # %bb.0: # %entry
+; X87-NEXT:    flds {{[0-9]+}}(%esp)
+; X87-NEXT:    retl
+;
+; NOSSE-NOX87-LABEL: f1:
+; NOSSE-NOX87:       # %bb.0: # %entry
+; NOSSE-NOX87-NEXT:    movl {{[0-9]+}}(%esp), %eax
+; NOSSE-NOX87-NEXT:    retl
+;
+; SSE-NOX87-LABEL: f1:
+; SSE-NOX87:       # %bb.0: # %entry
+; SSE-NOX87-NEXT:    movd {{.*#+}} xmm0 = mem[0],zero,zero,zero
+; SSE-NOX87-NEXT:    movd %xmm0, %eax
+; SSE-NOX87-NEXT:    retl
+entry:
+  ret float %b
+}
+
+define double @f2(double %a, double %b) nounwind {
+; X87-LABEL: f2:
+; X87:       # %bb.0: # %entry
+; X87-NEXT:    fldl {{[0-9]+}}(%esp)
+; X87-NEXT:    retl
+;
+; NOX87-LABEL: f2:
+; NOX87:       # %bb.0: # %entry
+; NOX87-NEXT:    movl {{[0-9]+}}(%esp), %eax
+; NOX87-NEXT:    movl {{[0-9]+}}(%esp), %edx
+; NOX87-NEXT:    retl
+entry:
+  ret double %b
+}
+
+define x86_fp80 @f3(x86_fp80 %a, x86_fp80 %b) nounwind {
+; X87-LABEL: f3:
+; X87:       # %bb.0: # %entry
+; X87-NEXT:    fldt {{[0-9]+}}(%esp)
+; X87-NEXT:    retl
+;
+; NOX87-LABEL: f3:
+; NOX87:       # %bb.0: # %entry
+; NOX87-NEXT:    movl {{[0-9]+}}(%esp), %eax
+; NOX87-NEXT:    movl {{[0-9]+}}(%esp), %edx
+; NOX87-NEXT:    movl {{[0-9]+}}(%esp), %ecx
+; NOX87-NEXT:    retl
+entry:
+  ret x86_fp80 %b
+}
+
+define float @f4(float %a, float %b) nounwind {
+; X87-LABEL: f4:
+; X87:       # %bb.0: # %entry
+; X87-NEXT:    flds {{[0-9]+}}(%esp)
+; X87-NEXT:    fadds {{[0-9]+}}(%esp)
+; X87-NEXT:    retl
+;
+; NOSSE-NOX87-LABEL: f4:
+; NOSSE-NOX87:       # %bb.0: # %entry
+; NOSSE-NOX87-NEXT:    pushl {{[0-9]+}}(%esp)
+; NOSSE-NOX87-NEXT:    pushl {{[0-9]+}}(%esp)
+; NOSSE-NOX87-NEXT:    calll __addsf3
+; NOSSE-NOX87-NEXT:    addl $8, %esp
+; NOSSE-NOX87-NEXT:    retl
+;
+; SSE-NOX87-LABEL: f4:
+; SSE-NOX87:       # %bb.0: # %entry
+; SSE-NOX87-NEXT:    movss {{.*#+}} xmm0 = mem[0],zero,zero,zero
+; SSE-NOX87-NEXT:    addss {{[0-9]+}}(%esp), %xmm0
+; SSE-NOX87-NEXT:    movd %xmm0, %eax
+; SSE-NOX87-NEXT:    retl
+entry:
+  %0 = fadd float %a, %b
+  ret float %0
+}
+
+define double @f5(double %a, double %b) nounwind {
+; X87-LABEL: f5:
+; X87:       # %bb.0: # %entry
+; X87-NEXT:    fldl {{[0-9]+}}(%esp)
+; X87-NEXT:    faddl {{[0-9]+}}(%esp)
+; X87-NEXT:    retl
+;
+; NOSSE-NOX87-LABEL: f5:
+; NOSSE-NOX87:       # %bb.0: # %entry
+; NOSSE-NOX87-NEXT:    pushl {{[0-9]+}}(%esp)
+; NOSSE-NOX87-NEXT:    pushl {{[0-9]+}}(%esp)
+; NOSSE-NOX87-NEXT:    pushl {{[0-9]+}}(%esp)
+; NOSSE-NOX87-NEXT:    pushl {{[0-9]+}}(%esp)
+; NOSSE-NOX87-NEXT:    calll __adddf3
+; NOSSE-NOX87-NEXT:    addl $16, %esp
+; NOSSE-NOX87-NEXT:    retl
+;
+; SSE-NOX87-LABEL: f5:
+; SSE-NOX87:       # %bb.0: # %entry
+; SSE-NOX87-NEXT:    pushl %ebp
+; SSE-NOX87-NEXT:    movl %esp, %ebp
+; SSE-NOX87-NEXT:    andl $-8, %esp
+; SSE-NOX87-NEXT:    subl $8, %esp
+; SSE-NOX87-NEXT:    movsd {{.*#+}} xmm0 = mem[0],zero
+; SSE-NOX87-NEXT:    addsd 16(%ebp), %xmm0
+; SSE-NOX87-NEXT:    movsd %xmm0, (%esp)
+; SSE-NOX87-NEXT:    movl (%esp), %eax
+; SSE-NOX87-NEXT:    movl {{[0-9]+}}(%esp), %edx
+; SSE-NOX87-NEXT:    movl %ebp, %esp
+; SSE-NOX87-NEXT:    popl %ebp
+; SSE-NOX87-NEXT:    retl
+entry:
+  %0 = fadd double %a, %b
+  ret double %0
+}
+
+; FIXME: We should not generate x87 instructions when x87 is disabled.
+define x86_fp80 @f6(x86_fp80 %a, x86_fp80 %b) nounwind {
+; X87-LABEL: f6:
+; X87:       # %bb.0: # %entry
+; X87-NEXT:    fldt {{[0-9]+}}(%esp)
+; X87-NEXT:    fldt {{[0-9]+}}(%esp)
+; X87-NEXT:    faddp %st, %st(1)
+; X87-NEXT:    retl
+;
+; NOX87-LABEL: f6:
+; NOX87:       # %bb.0: # %entry
+; NOX87-NEXT:    pushl %ebp
+; NOX87-NEXT:    movl %esp, %ebp
+; NOX87-NEXT:    andl $-8, %esp
+; NOX87-NEXT:    subl $48, %esp
+; NOX87-NEXT:    movl 20(%ebp), %eax
+; NOX87-NEXT:    movl 24(%ebp), %ecx
+; NOX87-NEXT:    movl %ecx, {{[0-9]+}}(%esp)
+; NOX87-NEXT:    movl %eax, {{[0-9]+}}(%esp)
+; NOX87-NEXT:    movl 28(%ebp), %eax
+; NOX87-NEXT:    movw %ax, {{[0-9]+}}(%esp)
+; NOX87-NEXT:    movl 8(%ebp), %eax
+; NOX87-NEXT:    movl 12(%ebp), %ecx
+; NOX87-NEXT:    movl %ecx, {{[0-9]+}}(%esp)
+; NOX87-NEXT:    movl %eax, {{[0-9]+}}(%esp)
+; NOX87-NEXT:    movl 16(%ebp), %eax
+; NOX87-NEXT:    movw %ax, {{[0-9]+}}(%esp)
+; NOX87-NEXT:    fldt {{[0-9]+}}(%esp)
+; NOX87-NEXT:    fldt {{[0-9]+}}(%esp)
+; NOX87-NEXT:    faddp %st, %st(1)
+; NOX87-NEXT:    fstpt (%esp)
+; NOX87-NEXT:    movl (%esp), %eax
+; NOX87-NEXT:    movl {{[0-9]+}}(%esp), %edx
+; NOX87-NEXT:    movzwl {{[0-9]+}}(%esp), %ecx
+; NOX87-NEXT:    movl %ebp, %esp
+; NOX87-NEXT:    popl %ebp
+; NOX87-NEXT:    retl
+entry:
+  %0 = fadd x86_fp80 %a, %b
+  ret x86_fp80 %0
+}
+
+define {float, float, float} @f7(float %a, float %b) nounwind {
+; X87-LABEL: f7:
+; X87:       # %bb.0: # %entry
+; X87-NEXT:    movl {{[0-9]+}}(%esp), %eax
+; X87-NEXT:    flds {{[0-9]+}}(%esp)
+; X87-NEXT:    flds {{[0-9]+}}(%esp)
+; X87-NEXT:    fstps 8(%eax)
+; X87-NEXT:    fsts 4(%eax)
+; X87-NEXT:    fstps (%eax)
+; X87-NEXT:    retl $4
+;
+; NOSSE-NOX87-LABEL: f7:
+; NOSSE-NOX87:       # %bb.0: # %entry
+; NOSSE-NOX87-NEXT:    movl {{[0-9]+}}(%esp), %eax
+; NOSSE-NOX87-NEXT:    movl {{[0-9]+}}(%esp), %ecx
+; NOSSE-NOX87-NEXT:    movl %eax, %edx
+; NOSSE-NOX87-NEXT:    retl
+;
+; SSE-NOX87-LABEL: f7:
+; SSE-NOX87:       # %bb.0: # %entry
+; SSE-NOX87-NEXT:    movd {{.*#+}} xmm0 = mem[0],zero,zero,zero
+; SSE-NOX87-NEXT:    movd {{.*#+}} xmm1 = mem[0],zero,zero,zero
+; SSE-NOX87-NEXT:    movd %xmm0, %eax
+; SSE-NOX87-NEXT:    movd %xmm0, %edx
+; SSE-NOX87-NEXT:    movd %xmm1, %ecx
+; SSE-NOX87-NEXT:    retl
+entry:
+  %0 = insertvalue {float, float, float} undef, float %a, 0
+  %1 = insertvalue {float, float, float} %0, float %a, 1
+  %2 = insertvalue {float, float, float} %1, float %b, 2
+  ret {float, float, float} %2
+}