diff --git a/llvm/lib/Target/PowerPC/PPCInstrInfo.td b/llvm/lib/Target/PowerPC/PPCInstrInfo.td
--- a/llvm/lib/Target/PowerPC/PPCInstrInfo.td
+++ b/llvm/lib/Target/PowerPC/PPCInstrInfo.td
@@ -2933,6 +2933,7 @@
                 PPC970_DGroup_Single, PPC970_Unit_FPU;
 }
 let Uses = [RM] in {
+  let hasSideEffects = 1 in
   def MFFS   : XForm_42<63, 583, (outs f8rc:$rT), (ins),
                          "mffs $rT", IIC_IntMFFS,
                          [(set f64:$rT, (PPCmffs))]>,
@@ -4333,6 +4334,7 @@
 def : InstAlias<"mtfsfi. $BF, $U", (MTFSFI_rec crrc:$BF, i32imm:$U, 0)>;
 
 let Predicates = [HasFPU] in {
+let hasSideEffects = 1 in
 def MTFSF : XFLForm_1<63, 711, (outs),
                       (ins i32imm:$FLM, f8rc:$FRB, i32imm:$L, i32imm:$W),
                       "mtfsf $FLM, $FRB, $L, $W", IIC_IntMFFS, []>;
diff --git a/llvm/test/CodeGen/PowerPC/2008-10-28-f128-i32.ll b/llvm/test/CodeGen/PowerPC/2008-10-28-f128-i32.ll
--- a/llvm/test/CodeGen/PowerPC/2008-10-28-f128-i32.ll
+++ b/llvm/test/CodeGen/PowerPC/2008-10-28-f128-i32.ll
@@ -92,18 +92,18 @@
 ; CHECK-NEXT:    fadd 1, 2, 1
 ; CHECK-NEXT:    mtfsf 1, 0
 ; CHECK-NEXT:    fctiwz 0, 1
-; CHECK-NEXT:    mffs 1
 ; CHECK-NEXT:    stfd 0, 160(1)
+; CHECK-NEXT:    mffs 0
 ; CHECK-NEXT:    mtfsb1 31
 ; CHECK-NEXT:    mtfsb0 30
-; CHECK-NEXT:    fadd 0, 28, 29
-; CHECK-NEXT:    mtfsf 1, 1
-; CHECK-NEXT:    lfs 1, .LCPI0_1@l(3)
-; CHECK-NEXT:    fctiwz 0, 0
-; CHECK-NEXT:    stfd 0, 152(1)
+; CHECK-NEXT:    fadd 1, 28, 29
+; CHECK-NEXT:    mtfsf 1, 0
+; CHECK-NEXT:    lfs 0, .LCPI0_1@l(3)
+; CHECK-NEXT:    fctiwz 1, 1
+; CHECK-NEXT:    stfd 1, 152(1)
 ; CHECK-NEXT:    fcmpu 0, 28, 27
 ; CHECK-NEXT:    lwz 3, 164(1)
-; CHECK-NEXT:    fcmpu 1, 29, 1
+; CHECK-NEXT:    fcmpu 1, 29, 0
 ; CHECK-NEXT:    lwz 4, 156(1)
 ; CHECK-NEXT:    crandc 20, 6, 0
 ; CHECK-NEXT:    cror 20, 5, 20
@@ -214,20 +214,20 @@
 ; CHECK-NEXT:    fadd 1, 2, 1
 ; CHECK-NEXT:    mtfsf 1, 0
 ; CHECK-NEXT:    fctiwz 0, 1
-; CHECK-NEXT:    mffs 1
 ; CHECK-NEXT:    stfd 0, 32(1)
+; CHECK-NEXT:    mffs 0
 ; CHECK-NEXT:    mtfsb1 31
-; CHECK-NEXT:    lfs 0, .LCPI0_2@l(3)
+; CHECK-NEXT:    lfs 1, .LCPI0_2@l(3)
 ; CHECK-NEXT:    lis 3, .LCPI0_3@ha
 ; CHECK-NEXT:    mtfsb0 30
 ; CHECK-NEXT:    fadd 2, 28, 29
-; CHECK-NEXT:    mtfsf 1, 1
-; CHECK-NEXT:    lfs 1, .LCPI0_3@l(3)
+; CHECK-NEXT:    mtfsf 1, 0
+; CHECK-NEXT:    lfs 0, .LCPI0_3@l(3)
 ; CHECK-NEXT:    fctiwz 2, 2
 ; CHECK-NEXT:    stfd 2, 24(1)
-; CHECK-NEXT:    fcmpu 0, 30, 0
+; CHECK-NEXT:    fcmpu 0, 30, 1
 ; CHECK-NEXT:    lwz 3, 36(1)
-; CHECK-NEXT:    fcmpu 1, 31, 1
+; CHECK-NEXT:    fcmpu 1, 31, 0
 ; CHECK-NEXT:    lwz 4, 28(1)
 ; CHECK-NEXT:    crandc 20, 6, 1
 ; CHECK-NEXT:    cror 20, 4, 20
@@ -269,20 +269,20 @@
 ; CHECK-NEXT:    fadd 1, 2, 1
 ; CHECK-NEXT:    mtfsf 1, 0
 ; CHECK-NEXT:    fctiwz 0, 1
-; CHECK-NEXT:    mffs 1
 ; CHECK-NEXT:    stfd 0, 96(1)
+; CHECK-NEXT:    mffs 0
 ; CHECK-NEXT:    mtfsb1 31
-; CHECK-NEXT:    lfs 0, .LCPI0_0@l(3)
+; CHECK-NEXT:    lfs 1, .LCPI0_0@l(3)
 ; CHECK-NEXT:    lis 3, .LCPI0_1@ha
 ; CHECK-NEXT:    mtfsb0 30
 ; CHECK-NEXT:    fadd 2, 30, 31
-; CHECK-NEXT:    mtfsf 1, 1
-; CHECK-NEXT:    lfs 1, .LCPI0_1@l(3)
+; CHECK-NEXT:    mtfsf 1, 0
+; CHECK-NEXT:    lfs 0, .LCPI0_1@l(3)
 ; CHECK-NEXT:    fctiwz 2, 2
 ; CHECK-NEXT:    stfd 2, 88(1)
-; CHECK-NEXT:    fcmpu 0, 30, 0
+; CHECK-NEXT:    fcmpu 0, 30, 1
 ; CHECK-NEXT:    lwz 3, 100(1)
-; CHECK-NEXT:    fcmpu 1, 31, 1
+; CHECK-NEXT:    fcmpu 1, 31, 0
 ; CHECK-NEXT:    lwz 4, 92(1)
 ; CHECK-NEXT:    crandc 20, 6, 0
 ; CHECK-NEXT:    cror 20, 5, 20