Index: llvm/lib/Target/PowerPC/PPCInstrInfo.cpp
===================================================================
--- llvm/lib/Target/PowerPC/PPCInstrInfo.cpp
+++ llvm/lib/Target/PowerPC/PPCInstrInfo.cpp
@@ -2984,8 +2984,10 @@
       if (PostRA) {
         if (isVFReg(MI.getOperand(0).getReg()))
           III.ImmOpcode = PPC::LXSSP;
-        else
+        else {
           III.ImmOpcode = PPC::LFS;
+          III.ImmMustBeMultipleOf = 1;
+        }
         break;
       }
       LLVM_FALLTHROUGH;
@@ -2996,8 +2998,10 @@
       if (PostRA) {
         if (isVFReg(MI.getOperand(0).getReg()))
           III.ImmOpcode = PPC::LXSD;
-        else
+        else {
           III.ImmOpcode = PPC::LFD;
+          III.ImmMustBeMultipleOf = 1;
+        }
         break;
       }
       LLVM_FALLTHROUGH;
@@ -3012,8 +3016,10 @@
       if (PostRA) {
         if (isVFReg(MI.getOperand(0).getReg()))
           III.ImmOpcode = PPC::STXSSP;
-        else
+        else {
           III.ImmOpcode = PPC::STFS;
+          III.ImmMustBeMultipleOf = 1;
+        }
         break;
       }
       LLVM_FALLTHROUGH;
@@ -3024,8 +3030,10 @@
       if (PostRA) {
         if (isVFReg(MI.getOperand(0).getReg()))
           III.ImmOpcode = PPC::STXSD;
-        else
+        else {
           III.ImmOpcode = PPC::STFD;
+          III.ImmMustBeMultipleOf = 1;
+        }
         break;
       }
       LLVM_FALLTHROUGH;
Index: llvm/test/CodeGen/PowerPC/convert-rr-to-ri-p9-vector.mir
===================================================================
--- /dev/null
+++ llvm/test/CodeGen/PowerPC/convert-rr-to-ri-p9-vector.mir
@@ -0,0 +1,162 @@
+# RUN: llc -mcpu=pwr9 -mtriple=powerpc64-unknown-linux-gnu -start-after \ 
+# RUN:   ppc-mi-peepholes -ppc-late-peephole %s -o - | FileCheck %s 
+
+---
+name:            testLXSSPX
+alignment:       4
+exposesReturnsTwice: false
+legalized:       false
+regBankSelected: false
+selected:        false
+tracksRegLiveness: true
+registers:
+  - { id: 0, class: g8rc_and_g8rc_nox0, preferred-register: '' }
+  - { id: 1, class: g8rc, preferred-register: '' }
+  - { id: 2, class: gprc_and_gprc_nor0, preferred-register: '' }
+  - { id: 3, class: gprc, preferred-register: '' }
+  - { id: 4, class: g8rc, preferred-register: '' }
+  - { id: 5, class: g8rc, preferred-register: '' }
+  - { id: 6, class: g8rc, preferred-register: '' }
+  - { id: 7, class: vssrc, preferred-register: '' }
+  - { id: 8, class: gprc, preferred-register: '' }
+  - { id: 9, class: g8rc, preferred-register: '' }
+  - { id: 10, class: g8rc, preferred-register: '' }
+  - { id: 11, class: g8rc, preferred-register: '' }
+  - { id: 12, class: vssrc, preferred-register: '' }
+  - { id: 13, class: vssrc, preferred-register: '' }
+liveins:
+  - { reg: '$x3', virtual-reg: '%0' }
+  - { reg: '$x4', virtual-reg: '%1' }
+body:             |
+  bb.0.entry:
+    liveins: $x3, $x4
+
+    %1 = COPY $x4
+    %0 = COPY $x3
+    %2 = COPY %1.sub_32
+    %3 = ADDI %2, 1
+    %5 = IMPLICIT_DEF
+    %4 = INSERT_SUBREG %5, killed %3, 1
+    %6 = LI8 97
+    %7 = LXSSPX %0, killed %6, implicit $rm
+    ; CHECK:  lfs [[REG1:[0-9]+]], 97(3)
+    %8 = ADDI %2, 2
+    %10 = IMPLICIT_DEF
+    %9 = INSERT_SUBREG %10, killed %8, 1
+    %11 = LI8 -92
+    %12 = LXSSPX %0, killed %11, implicit $rm
+    ; CHECK-NEXT:  lfs [[REG2:[0-9]+]], -92(3)
+    %13 = XSADDSP killed %7, killed %12
+    ; CHECK-NEXT:  xsaddsp {{[0-9]+}}, [[REG1]], [[REG2]]
+    $f1 = COPY %13
+    BLR8 implicit $lr8, implicit $rm, implicit $f1
+...
+
+
+---
+name:            testLXSDX
+tracksRegLiveness: true
+registers:       
+  - { id: 0, class: g8rc_and_g8rc_nox0, preferred-register: '' }
+  - { id: 1, class: g8rc, preferred-register: '' }
+  - { id: 2, class: gprc_and_gprc_nor0, preferred-register: '' }
+  - { id: 3, class: gprc, preferred-register: '' }
+  - { id: 4, class: g8rc, preferred-register: '' }
+  - { id: 5, class: g8rc, preferred-register: '' }
+  - { id: 6, class: g8rc, preferred-register: '' }
+  - { id: 7, class: vsfrc, preferred-register: '' }
+  - { id: 8, class: gprc, preferred-register: '' }
+  - { id: 9, class: g8rc, preferred-register: '' }
+  - { id: 10, class: g8rc, preferred-register: '' }
+  - { id: 11, class: g8rc, preferred-register: '' }
+  - { id: 12, class: vsfrc, preferred-register: '' }
+  - { id: 13, class: vsfrc, preferred-register: '' }
+liveins:         
+  - { reg: '$x3', virtual-reg: '%0' }
+  - { reg: '$x4', virtual-reg: '%1' }
+body:             |
+  bb.0.entry:
+    liveins: $x3, $x4
+  
+    %1 = COPY $x4
+    %0 = COPY $x3
+    %2 = COPY %1.sub_32
+    %3 = ADDI %2, 1
+    %5 = IMPLICIT_DEF
+    %4 = INSERT_SUBREG %5, killed %3, 1
+    %6 = LI8 99
+    %7 = LXSDX %0, killed %6, implicit $rm
+    ; CHECK:  lfd [[REG1:[0-9]+]], 99(3)
+    %8 = ADDI %2, 2
+    %10 = IMPLICIT_DEF
+    %9 = INSERT_SUBREG %10, killed %8, 1
+    %11 = LI8 -120
+    %12 = LXSDX %0, killed %11, implicit $rm
+    ; CHECK-NEXT:  lfd [[REG2:[0-9]+]], -120(3)
+    %13 = XSADDDP killed %7, killed %12, implicit $rm
+    ; CHECK-NEXT:  xsadddp {{[0-9]+}}, [[REG1]], [[REG2]]
+    $f1 = COPY %13
+    BLR8 implicit $lr8, implicit $rm, implicit $f1
+...
+
+
+---
+name:            testSTXSSPX
+alignment:       4
+exposesReturnsTwice: false
+legalized:       false
+regBankSelected: false
+selected:        false
+tracksRegLiveness: true
+registers:
+  - { id: 0, class: g8rc_and_g8rc_nox0, preferred-register: '' }
+  - { id: 1, class: vssrc, preferred-register: '' }
+  - { id: 2, class: g8rc, preferred-register: '' }
+  - { id: 3, class: g8rc, preferred-register: '' }
+liveins:
+  - { reg: '$x3', virtual-reg: '%0' }
+  - { reg: '$f1', virtual-reg: '%1' }
+  - { reg: '$x5', virtual-reg: '%2' }
+body:             |
+  bb.0.entry:
+    liveins: $x3, $f1, $x5
+
+    %2 = COPY $x5
+    %1 = COPY $f1
+    %0 = COPY $x3
+    %3 = LI8 443
+    STXSSPX %1, %0, killed %3, implicit $rm
+    ; CHECK: stfs {{[0-9]+}}, 443(3)
+    BLR8 implicit $lr8, implicit $rm
+...
+
+
+---
+name:            testSTXSDX
+alignment:       4
+exposesReturnsTwice: false
+legalized:       false
+regBankSelected: false
+selected:        false
+tracksRegLiveness: true
+registers:
+  - { id: 0, class: g8rc_and_g8rc_nox0, preferred-register: '' }
+  - { id: 1, class: vsfrc, preferred-register: '' }
+  - { id: 2, class: g8rc, preferred-register: '' }
+  - { id: 3, class: g8rc, preferred-register: '' }
+liveins:
+  - { reg: '$x3', virtual-reg: '%0' }
+  - { reg: '$f1', virtual-reg: '%1' }
+  - { reg: '$x5', virtual-reg: '%2' }
+body:             |
+  bb.0.entry:
+    liveins: $x3, $f1, $x5
+
+    %2 = COPY $x5
+    %1 = COPY $f1
+    %0 = COPY $x3
+    %3 = LI8  7
+    STXSDX %1, %0, killed %3, implicit $rm
+    ; CHECK: stfd {{[0-9]+}}, 7(3)
+    BLR8 implicit $lr8, implicit $rm
+...