Rewrite pre-increment store patterns to use standard memory operands.

Currently, pre-increment store patterns are written to use two separate
operands to represent address base and displacement:

  stwu $rS, $ptroff($ptrreg)

This causes problems when implementing the assembler parser, so this
commit changes the patterns to use standard (complex) memory operands
like in all other memory access instruction patterns:

  stwu $rS, $dst

To still match those instructions against the appropriate pre_store
SelectionDAG nodes, the patch uses the new feature that allows a Pat
to match multiple DAG operands against a single (complex) instruction
operand.

Approved by Hal Finkel.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@177429 91177308-0d34-0410-b5e6-96231b3b80d8

3 files changed, 291 insertions, 151 deletions

diff --git a/lib/Target/PowerPC/PPCInstr64Bit.td b/lib/Target/PowerPC/PPCInstr64Bit.td
index c2fdba13d1..1cc1a5c3b6 100644
--- a/lib/Target/PowerPC/PPCInstr64Bit.td
+++ b/lib/Target/PowerPC/PPCInstr64Bit.td
@@ -814,78 +814,6 @@ def STDX  : XForm_8<31, 149, (outs), (ins G8RC:$rS, memrr:$dst),
                    "stdx $rS, $dst", LdStSTD,
                    [(store G8RC:$rS, xaddr:$dst)]>, isPPC64,
                    PPC970_DGroup_Cracked;
-}
-
-let PPC970_Unit = 2 in {
-
-def STBU8 : DForm_1a<39, (outs ptr_rc_nor0:$ea_res), (ins G8RC:$rS,
-                             symbolLo:$ptroff, ptr_rc_nor0:$ptrreg),
-                    "stbu $rS, $ptroff($ptrreg)", LdStStoreUpd,
-                    [(set ptr_rc_nor0:$ea_res,
-                          (pre_truncsti8 G8RC:$rS, ptr_rc_nor0:$ptrreg, 
-                                         iaddroff:$ptroff))]>,
-                    RegConstraint<"$ptrreg = $ea_res">, NoEncode<"$ea_res">;
-def STHU8 : DForm_1a<45, (outs ptr_rc_nor0:$ea_res), (ins G8RC:$rS,
-                             symbolLo:$ptroff, ptr_rc_nor0:$ptrreg),
-                    "sthu $rS, $ptroff($ptrreg)", LdStStoreUpd,
-                    [(set ptr_rc_nor0:$ea_res,
-                        (pre_truncsti16 G8RC:$rS, ptr_rc_nor0:$ptrreg, 
-                                        iaddroff:$ptroff))]>,
-                    RegConstraint<"$ptrreg = $ea_res">, NoEncode<"$ea_res">;
-
-def STWU8 : DForm_1a<37, (outs ptr_rc_nor0:$ea_res), (ins G8RC:$rS,
-                             symbolLo:$ptroff, ptr_rc_nor0:$ptrreg),
-                    "stwu $rS, $ptroff($ptrreg)", LdStStoreUpd,
-                    [(set ptr_rc_nor0:$ea_res,
-                          (pre_truncsti32 G8RC:$rS, ptr_rc_nor0:$ptrreg,
-                                          iaddroff:$ptroff))]>,
-                    RegConstraint<"$ptrreg = $ea_res">, NoEncode<"$ea_res">;
-
-def STDU : DSForm_1a<62, 1, (outs ptr_rc_nor0:$ea_res), (ins G8RC:$rS,
-                                        s16immX4:$ptroff, ptr_rc_nor0:$ptrreg),
-                    "stdu $rS, $ptroff($ptrreg)", LdStSTDU,
-                    [(set ptr_rc_nor0:$ea_res,
-                       (aligned4pre_store G8RC:$rS, ptr_rc_nor0:$ptrreg, 
-                                          iaddroff:$ptroff))]>,
-                    RegConstraint<"$ptrreg = $ea_res">, NoEncode<"$ea_res">,
-                    isPPC64;
-
-
-def STBUX8 : XForm_8<31, 247, (outs ptr_rc_nor0:$ea_res),
-                              (ins G8RC:$rS, ptr_rc_nor0:$ptroff, ptr_rc:$ptrreg),
-                    "stbux $rS, $ptroff, $ptrreg", LdStStoreUpd,
-                    [(set ptr_rc_nor0:$ea_res,
-                       (pre_truncsti8 G8RC:$rS,
-                                      ptr_rc:$ptrreg, xaddroff:$ptroff))]>,
-                    RegConstraint<"$ptroff = $ea_res">, NoEncode<"$ea_res">,
-                    PPC970_DGroup_Cracked;
-
-def STHUX8 : XForm_8<31, 439, (outs ptr_rc_nor0:$ea_res),
-                              (ins G8RC:$rS, ptr_rc_nor0:$ptroff, ptr_rc:$ptrreg),
-                    "sthux $rS, $ptroff, $ptrreg", LdStStoreUpd,
-                    [(set ptr_rc_nor0:$ea_res,
-                       (pre_truncsti16 G8RC:$rS,
-                                       ptr_rc:$ptrreg, xaddroff:$ptroff))]>,
-                    RegConstraint<"$ptroff = $ea_res">, NoEncode<"$ea_res">,
-                    PPC970_DGroup_Cracked;
-
-def STWUX8 : XForm_8<31, 183, (outs ptr_rc_nor0:$ea_res),
-                              (ins G8RC:$rS, ptr_rc_nor0:$ptroff, ptr_rc:$ptrreg),
-                    "stwux $rS, $ptroff, $ptrreg", LdStStoreUpd,
-                    [(set ptr_rc_nor0:$ea_res,
-                       (pre_truncsti32 G8RC:$rS,
-                                       ptr_rc:$ptrreg, xaddroff:$ptroff))]>,
-                    RegConstraint<"$ptroff = $ea_res">, NoEncode<"$ea_res">,
-                    PPC970_DGroup_Cracked;
-
-def STDUX : XForm_8<31, 181, (outs ptr_rc_nor0:$ea_res),
-                              (ins G8RC:$rS, ptr_rc_nor0:$ptroff, ptr_rc:$ptrreg),
-                    "stdux $rS, $ptroff, $ptrreg", LdStSTDU,
-                    [(set ptr_rc_nor0:$ea_res,
-                       (pre_store G8RC:$rS, ptr_rc:$ptrreg, xaddroff:$ptroff))]>,
-                    RegConstraint<"$ptroff = $ea_res">, NoEncode<"$ea_res">,
-                    PPC970_DGroup_Cracked, isPPC64;
-
 // STD_32/STDX_32 - Just like STD/STDX, but uses a '32-bit' input register.
 def STD_32  : DSForm_1<62, 0, (outs), (ins GPRC:$rT, memrix:$dst),
                        "std $rT, $dst", LdStSTD,
@@ -896,6 +824,60 @@ def STDX_32  : XForm_8<31, 149, (outs), (ins GPRC:$rT, memrr:$dst),
                        PPC970_DGroup_Cracked;
 }
 
+// Stores with Update (pre-inc).
+let PPC970_Unit = 2, mayStore = 1 in {
+def STBU8 : DForm_1<39, (outs ptr_rc_nor0:$ea_res), (ins G8RC:$rS, memri:$dst),
+                   "stbu $rS, $dst", LdStStoreUpd, []>,
+                   RegConstraint<"$dst.reg = $ea_res">, NoEncode<"$ea_res">;
+def STHU8 : DForm_1<45, (outs ptr_rc_nor0:$ea_res), (ins G8RC:$rS, memri:$dst),
+                   "sthu $rS, $dst", LdStStoreUpd, []>,
+                   RegConstraint<"$dst.reg = $ea_res">, NoEncode<"$ea_res">;
+def STWU8 : DForm_1<37, (outs ptr_rc_nor0:$ea_res), (ins G8RC:$rS, memri:$dst),
+                   "stwu $rS, $dst", LdStStoreUpd, []>,
+                   RegConstraint<"$dst.reg = $ea_res">, NoEncode<"$ea_res">;
+def STDU : DSForm_1<62, 1, (outs ptr_rc_nor0:$ea_res), (ins G8RC:$rS, memrix:$dst),
+                   "stdu $rS, $dst", LdStSTDU, []>,
+                   RegConstraint<"$dst.reg = $ea_res">, NoEncode<"$ea_res">,
+                   isPPC64;
+
+def STBUX8: XForm_8<31, 247, (outs ptr_rc_nor0:$ea_res), (ins G8RC:$rS, memrr:$dst),
+                    "stbux $rS, $dst", LdStStoreUpd, []>,
+                    RegConstraint<"$dst.offreg = $ea_res">, NoEncode<"$ea_res">,
+                    PPC970_DGroup_Cracked;
+def STHUX8: XForm_8<31, 439, (outs ptr_rc_nor0:$ea_res), (ins G8RC:$rS, memrr:$dst),
+                    "sthux $rS, $dst", LdStStoreUpd, []>,
+                    RegConstraint<"$dst.offreg = $ea_res">, NoEncode<"$ea_res">,
+                    PPC970_DGroup_Cracked;
+def STWUX8: XForm_8<31, 183, (outs ptr_rc_nor0:$ea_res), (ins G8RC:$rS, memrr:$dst),
+                    "stwux $rS, $dst", LdStStoreUpd, []>,
+                    RegConstraint<"$dst.offreg = $ea_res">, NoEncode<"$ea_res">,
+                    PPC970_DGroup_Cracked;
+def STDUX : XForm_8<31, 181, (outs ptr_rc_nor0:$ea_res), (ins G8RC:$rS, memrr:$dst),
+                    "stdux $rS, $dst", LdStSTDU, []>,
+                    RegConstraint<"$dst.offreg = $ea_res">, NoEncode<"$ea_res">,
+                    PPC970_DGroup_Cracked, isPPC64;
+}
+
+// Patterns to match the pre-inc stores.  We can't put the patterns on
+// the instruction definitions directly as ISel wants the address base
+// and offset to be separate operands, not a single complex operand.
+def : Pat<(pre_truncsti8 G8RC:$rS, ptr_rc_nor0:$ptrreg, iaddroff:$ptroff),
+          (STBU8 G8RC:$rS, iaddroff:$ptroff, ptr_rc_nor0:$ptrreg)>;
+def : Pat<(pre_truncsti16 G8RC:$rS, ptr_rc_nor0:$ptrreg, iaddroff:$ptroff),
+          (STHU8 G8RC:$rS, iaddroff:$ptroff, ptr_rc_nor0:$ptrreg)>;
+def : Pat<(pre_truncsti32 G8RC:$rS, ptr_rc_nor0:$ptrreg, iaddroff:$ptroff),
+          (STWU8 G8RC:$rS, iaddroff:$ptroff, ptr_rc_nor0:$ptrreg)>;
+def : Pat<(aligned4pre_store G8RC:$rS, ptr_rc_nor0:$ptrreg, iaddroff:$ptroff),
+          (STDU G8RC:$rS, iaddroff:$ptroff, ptr_rc_nor0:$ptrreg)>;
+
+def : Pat<(pre_truncsti8 G8RC:$rS, ptr_rc:$ptrreg, xaddroff:$ptroff),
+          (STBUX8 G8RC:$rS, xaddroff:$ptroff, ptr_rc:$ptrreg)>;
+def : Pat<(pre_truncsti16 G8RC:$rS, ptr_rc:$ptrreg, xaddroff:$ptroff),
+          (STHUX8 G8RC:$rS, xaddroff:$ptroff, ptr_rc:$ptrreg)>;
+def : Pat<(pre_truncsti32 G8RC:$rS, ptr_rc:$ptrreg, xaddroff:$ptroff),
+          (STWUX8 G8RC:$rS, xaddroff:$ptroff, ptr_rc:$ptrreg)>;
+def : Pat<(pre_store G8RC:$rS, ptr_rc:$ptrreg, xaddroff:$ptroff),
+          (STDUX G8RC:$rS, xaddroff:$ptroff, ptr_rc:$ptrreg)>;
 
 
 //===----------------------------------------------------------------------===//
diff --git a/lib/Target/PowerPC/PPCInstrInfo.td b/lib/Target/PowerPC/PPCInstrInfo.td
index 52e112755b..6174036a3c 100644
--- a/lib/Target/PowerPC/PPCInstrInfo.td
+++ b/lib/Target/PowerPC/PPCInstrInfo.td
@@ -346,9 +346,6 @@ def s16imm  : Operand<i32> {
 def u16imm  : Operand<i32> {
   let PrintMethod = "printU16ImmOperand";
 }
-def s16immX4  : Operand<i32> {   // Multiply imm by 4 before printing.
-  let PrintMethod = "printS16X4ImmOperand";
-}
 def directbrtarget : Operand<OtherVT> {
   let PrintMethod = "printBranchOperand";
   let EncoderMethod = "getDirectBrEncoding";
@@ -870,44 +867,39 @@ def STFD : DForm_1<54, (outs), (ins F8RC:$rS, memri:$dst),
 }
 
 // Unindexed (r+i) Stores with Update (preinc).
-let PPC970_Unit = 2 in {
-def STBU  : DForm_1a<39, (outs ptr_rc_nor0:$ea_res), (ins GPRC:$rS,
-                             symbolLo:$ptroff, ptr_rc_nor0:$ptrreg),
-                    "stbu $rS, $ptroff($ptrreg)", LdStStoreUpd,
-                    [(set ptr_rc_nor0:$ea_res,
-                          (pre_truncsti8 GPRC:$rS, ptr_rc_nor0:$ptrreg, 
-                                         iaddroff:$ptroff))]>,
-                    RegConstraint<"$ptrreg = $ea_res">, NoEncode<"$ea_res">;
-def STHU  : DForm_1a<45, (outs ptr_rc_nor0:$ea_res), (ins GPRC:$rS,
-                             symbolLo:$ptroff, ptr_rc_nor0:$ptrreg),
-                    "sthu $rS, $ptroff($ptrreg)", LdStStoreUpd,
-                    [(set ptr_rc_nor0:$ea_res,
-                        (pre_truncsti16 GPRC:$rS, ptr_rc_nor0:$ptrreg, 
-                                        iaddroff:$ptroff))]>,
-                    RegConstraint<"$ptrreg = $ea_res">, NoEncode<"$ea_res">;
-def STWU  : DForm_1a<37, (outs ptr_rc_nor0:$ea_res), (ins GPRC:$rS,
-                             symbolLo:$ptroff, ptr_rc_nor0:$ptrreg),
-                    "stwu $rS, $ptroff($ptrreg)", LdStStoreUpd,
-                    [(set ptr_rc_nor0:$ea_res, (pre_store GPRC:$rS, ptr_rc_nor0:$ptrreg, 
-                                                     iaddroff:$ptroff))]>,
-                    RegConstraint<"$ptrreg = $ea_res">, NoEncode<"$ea_res">;
-def STFSU : DForm_1a<37, (outs ptr_rc_nor0:$ea_res), (ins F4RC:$rS,
-                             symbolLo:$ptroff, ptr_rc_nor0:$ptrreg),
-                    "stfsu $rS, $ptroff($ptrreg)", LdStSTFDU,
-                    [(set ptr_rc_nor0:$ea_res, (pre_store F4RC:$rS,  ptr_rc_nor0:$ptrreg, 
-                                          iaddroff:$ptroff))]>,
-                    RegConstraint<"$ptrreg = $ea_res">, NoEncode<"$ea_res">;
-def STFDU : DForm_1a<37, (outs ptr_rc_nor0:$ea_res), (ins F8RC:$rS,
-                             symbolLo:$ptroff, ptr_rc_nor0:$ptrreg),
-                    "stfdu $rS, $ptroff($ptrreg)", LdStSTFDU,
-                    [(set ptr_rc_nor0:$ea_res, (pre_store F8RC:$rS, ptr_rc_nor0:$ptrreg, 
-                                          iaddroff:$ptroff))]>,
-                    RegConstraint<"$ptrreg = $ea_res">, NoEncode<"$ea_res">;
+let PPC970_Unit = 2, mayStore = 1 in {
+def STBU  : DForm_1<39, (outs ptr_rc_nor0:$ea_res), (ins GPRC:$rS, memri:$dst),
+                    "stbu $rS, $dst", LdStStoreUpd, []>,
+                    RegConstraint<"$dst.reg = $ea_res">, NoEncode<"$ea_res">;
+def STHU  : DForm_1<45, (outs ptr_rc_nor0:$ea_res), (ins GPRC:$rS, memri:$dst),
+                    "sthu $rS, $dst", LdStStoreUpd, []>,
+                    RegConstraint<"$dst.reg = $ea_res">, NoEncode<"$ea_res">;
+def STWU  : DForm_1<37, (outs ptr_rc_nor0:$ea_res), (ins GPRC:$rS, memri:$dst),
+                    "stwu $rS, $dst", LdStStoreUpd, []>,
+                    RegConstraint<"$dst.reg = $ea_res">, NoEncode<"$ea_res">;
+def STFSU : DForm_1<37, (outs ptr_rc_nor0:$ea_res), (ins F4RC:$rS, memri:$dst),
+                    "stfsu $rS, $dst", LdStSTFDU, []>,
+                    RegConstraint<"$dst.reg = $ea_res">, NoEncode<"$ea_res">;
+def STFDU : DForm_1<37, (outs ptr_rc_nor0:$ea_res), (ins F8RC:$rS, memri:$dst),
+                    "stfdu $rS, $dst", LdStSTFDU, []>,
+                    RegConstraint<"$dst.reg = $ea_res">, NoEncode<"$ea_res">;
 }
 
+// Patterns to match the pre-inc stores.  We can't put the patterns on
+// the instruction definitions directly as ISel wants the address base
+// and offset to be separate operands, not a single complex operand.
+def : Pat<(pre_truncsti8 GPRC:$rS, ptr_rc_nor0:$ptrreg, iaddroff:$ptroff),
+          (STBU GPRC:$rS, iaddroff:$ptroff, ptr_rc_nor0:$ptrreg)>;
+def : Pat<(pre_truncsti16 GPRC:$rS, ptr_rc_nor0:$ptrreg, iaddroff:$ptroff),
+          (STHU GPRC:$rS, iaddroff:$ptroff, ptr_rc_nor0:$ptrreg)>;
+def : Pat<(pre_store GPRC:$rS, ptr_rc_nor0:$ptrreg, iaddroff:$ptroff),
+          (STWU GPRC:$rS, iaddroff:$ptroff, ptr_rc_nor0:$ptrreg)>;
+def : Pat<(pre_store F4RC:$rS, ptr_rc_nor0:$ptrreg, iaddroff:$ptroff),
+          (STFSU F4RC:$rS, iaddroff:$ptroff, ptr_rc_nor0:$ptrreg)>;
+def : Pat<(pre_store F8RC:$rS, ptr_rc_nor0:$ptrreg, iaddroff:$ptroff),
+          (STFDU F8RC:$rS, iaddroff:$ptroff, ptr_rc_nor0:$ptrreg)>;
 
 // Indexed (r+r) Stores.
-//
 let PPC970_Unit = 2 in {
 def STBX  : XForm_8<31, 215, (outs), (ins GPRC:$rS, memrr:$dst),
                    "stbx $rS, $dst", LdStStore,
@@ -922,48 +914,6 @@ def STWX  : XForm_8<31, 151, (outs), (ins GPRC:$rS, memrr:$dst),
                    [(store GPRC:$rS, xaddr:$dst)]>,
                    PPC970_DGroup_Cracked;
  
-def STBUX : XForm_8<31, 247, (outs ptr_rc_nor0:$ea_res),
-                             (ins GPRC:$rS, ptr_rc_nor0:$ptroff, ptr_rc:$ptrreg),
-                   "stbux $rS, $ptroff, $ptrreg", LdStStoreUpd,
-                   [(set ptr_rc_nor0:$ea_res,
-                      (pre_truncsti8 GPRC:$rS,
-                                     ptr_rc:$ptrreg, xaddroff:$ptroff))]>,
-                   RegConstraint<"$ptroff = $ea_res">, NoEncode<"$ea_res">,
-                   PPC970_DGroup_Cracked;
- 
-def STHUX : XForm_8<31, 439, (outs ptr_rc_nor0:$ea_res),
-                             (ins GPRC:$rS, ptr_rc_nor0:$ptroff, ptr_rc:$ptrreg),
-                   "sthux $rS, $ptroff, $ptrreg", LdStStoreUpd,
-                   [(set ptr_rc_nor0:$ea_res,
-                      (pre_truncsti16 GPRC:$rS,
-                                      ptr_rc:$ptrreg, xaddroff:$ptroff))]>,
-                   RegConstraint<"$ptroff = $ea_res">, NoEncode<"$ea_res">,
-                   PPC970_DGroup_Cracked;
-                 
-def STWUX : XForm_8<31, 183, (outs ptr_rc_nor0:$ea_res),
-                             (ins GPRC:$rS, ptr_rc_nor0:$ptroff, ptr_rc:$ptrreg),
-                   "stwux $rS, $ptroff, $ptrreg", LdStStoreUpd,
-                   [(set ptr_rc_nor0:$ea_res,
-                      (pre_store GPRC:$rS, ptr_rc:$ptrreg, xaddroff:$ptroff))]>,
-                   RegConstraint<"$ptroff = $ea_res">, NoEncode<"$ea_res">,
-                   PPC970_DGroup_Cracked;
-
-def STFSUX : XForm_8<31, 695, (outs ptr_rc_nor0:$ea_res),
-                              (ins F4RC:$rS, ptr_rc_nor0:$ptroff, ptr_rc:$ptrreg),
-                    "stfsux $rS, $ptroff, $ptrreg", LdStSTFDU,
-                    [(set ptr_rc_nor0:$ea_res,
-                       (pre_store F4RC:$rS, ptr_rc:$ptrreg, xaddroff:$ptroff))]>,
-                    RegConstraint<"$ptroff = $ea_res">, NoEncode<"$ea_res">,
-                    PPC970_DGroup_Cracked;
-
-def STFDUX : XForm_8<31, 759, (outs ptr_rc_nor0:$ea_res),
-                              (ins F8RC:$rS, ptr_rc_nor0:$ptroff, ptr_rc:$ptrreg),
-                    "stfdux $rS, $ptroff, $ptrreg", LdStSTFDU,
-                    [(set ptr_rc_nor0:$ea_res,
-                       (pre_store F8RC:$rS, ptr_rc:$ptrreg, xaddroff:$ptroff))]>,
-                    RegConstraint<"$ptroff = $ea_res">, NoEncode<"$ea_res">,
-                    PPC970_DGroup_Cracked;
-
 def STHBRX: XForm_8<31, 918, (outs), (ins GPRC:$rS, memrr:$dst),
                    "sthbrx $rS, $dst", LdStStore,
                    [(PPCstbrx GPRC:$rS, xoaddr:$dst, i16)]>, 
@@ -985,6 +935,44 @@ def STFDX : XForm_28<31, 727, (outs), (ins F8RC:$frS, memrr:$dst),
                      [(store F8RC:$frS, xaddr:$dst)]>;
 }
 
+// Indexed (r+r) Stores with Update (preinc).
+let PPC970_Unit = 2, mayStore = 1 in {
+def STBUX : XForm_8<31, 247, (outs ptr_rc_nor0:$ea_res), (ins GPRC:$rS, memrr:$dst),
+                    "stbux $rS, $dst", LdStStoreUpd, []>,
+                    RegConstraint<"$dst.offreg = $ea_res">, NoEncode<"$ea_res">,
+                    PPC970_DGroup_Cracked;
+def STHUX : XForm_8<31, 439, (outs ptr_rc_nor0:$ea_res), (ins GPRC:$rS, memrr:$dst),
+                    "sthux $rS, $dst", LdStStoreUpd, []>,
+                    RegConstraint<"$dst.offreg = $ea_res">, NoEncode<"$ea_res">,
+                    PPC970_DGroup_Cracked;
+def STWUX : XForm_8<31, 183, (outs ptr_rc_nor0:$ea_res), (ins GPRC:$rS, memrr:$dst),
+                    "stwux $rS, $dst", LdStStoreUpd, []>,
+                    RegConstraint<"$dst.offreg = $ea_res">, NoEncode<"$ea_res">,
+                    PPC970_DGroup_Cracked;
+def STFSUX: XForm_8<31, 695, (outs ptr_rc_nor0:$ea_res), (ins F4RC:$rS, memrr:$dst),
+                    "stfsux $rS, $dst", LdStSTFDU, []>,
+                    RegConstraint<"$dst.offreg = $ea_res">, NoEncode<"$ea_res">,
+                    PPC970_DGroup_Cracked;
+def STFDUX: XForm_8<31, 759, (outs ptr_rc_nor0:$ea_res), (ins F8RC:$rS, memrr:$dst),
+                    "stfdux $rS, $dst", LdStSTFDU, []>,
+                    RegConstraint<"$dst.offreg = $ea_res">, NoEncode<"$ea_res">,
+                    PPC970_DGroup_Cracked;
+}
+
+// Patterns to match the pre-inc stores.  We can't put the patterns on
+// the instruction definitions directly as ISel wants the address base
+// and offset to be separate operands, not a single complex operand.
+def : Pat<(pre_truncsti8 GPRC:$rS, ptr_rc:$ptrreg, xaddroff:$ptroff),
+          (STBUX GPRC:$rS, xaddroff:$ptroff, ptr_rc:$ptrreg)>;
+def : Pat<(pre_truncsti16 GPRC:$rS, ptr_rc:$ptrreg, xaddroff:$ptroff),
+          (STHUX GPRC:$rS, xaddroff:$ptroff, ptr_rc:$ptrreg)>;
+def : Pat<(pre_store GPRC:$rS, ptr_rc:$ptrreg, xaddroff:$ptroff),
+          (STWUX GPRC:$rS, xaddroff:$ptroff, ptr_rc:$ptrreg)>;
+def : Pat<(pre_store F4RC:$rS, ptr_rc:$ptrreg, xaddroff:$ptroff),
+          (STFSUX F4RC:$rS, xaddroff:$ptroff, ptr_rc:$ptrreg)>;
+def : Pat<(pre_store F8RC:$rS, ptr_rc:$ptrreg, xaddroff:$ptroff),
+          (STFDUX F8RC:$rS, xaddroff:$ptroff, ptr_rc:$ptrreg)>;
+
 def SYNC : XForm_24_sync<31, 598, (outs), (ins),
                         "sync", LdStSync,
                         [(int_ppc_sync)]>;
diff --git a/test/CodeGen/PowerPC/store-update.ll b/test/CodeGen/PowerPC/store-update.ll
new file mode 100644
index 0000000000..538ed24fbc
--- /dev/null
+++ b/test/CodeGen/PowerPC/store-update.ll
@@ -0,0 +1,170 @@
+; RUN: llc < %s | FileCheck %s
+
+target datalayout = "E-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-f128:128:128-v128:128:128-n32:64"
+target triple = "powerpc64-unknown-linux-gnu"
+
+define i8* @stbu(i8* %base, i8 zeroext %val) nounwind {
+entry:
+  %arrayidx = getelementptr inbounds i8* %base, i64 16
+  store i8 %val, i8* %arrayidx, align 1
+  ret i8* %arrayidx
+}
+; CHECK: @stbu
+; CHECK: %entry
+; CHECK-NEXT: stbu
+; CHECK-NEXT: blr
+
+define i8* @stbux(i8* %base, i8 zeroext %val, i64 %offset) nounwind {
+entry:
+  %arrayidx = getelementptr inbounds i8* %base, i64 %offset
+  store i8 %val, i8* %arrayidx, align 1
+  ret i8* %arrayidx
+}
+; CHECK: @stbux
+; CHECK: %entry
+; CHECK-NEXT: stbux
+; CHECK-NEXT: blr
+
+define i16* @sthu(i16* %base, i16 zeroext %val) nounwind {
+entry:
+  %arrayidx = getelementptr inbounds i16* %base, i64 16
+  store i16 %val, i16* %arrayidx, align 2
+  ret i16* %arrayidx
+}
+; CHECK: @sthu
+; CHECK: %entry
+; CHECK-NEXT: sthu
+; CHECK-NEXT: blr
+
+define i16* @sthux(i16* %base, i16 zeroext %val, i64 %offset) nounwind {
+entry:
+  %arrayidx = getelementptr inbounds i16* %base, i64 %offset
+  store i16 %val, i16* %arrayidx, align 2
+  ret i16* %arrayidx
+}
+; CHECK: @sthux
+; CHECK: %entry
+; CHECK-NEXT: sldi
+; CHECK-NEXT: sthux
+; CHECK-NEXT: blr
+
+define i32* @stwu(i32* %base, i32 zeroext %val) nounwind {
+entry:
+  %arrayidx = getelementptr inbounds i32* %base, i64 16
+  store i32 %val, i32* %arrayidx, align 4
+  ret i32* %arrayidx
+}
+; CHECK: @stwu
+; CHECK: %entry
+; CHECK-NEXT: stwu
+; CHECK-NEXT: blr
+
+define i32* @stwux(i32* %base, i32 zeroext %val, i64 %offset) nounwind {
+entry:
+  %arrayidx = getelementptr inbounds i32* %base, i64 %offset
+  store i32 %val, i32* %arrayidx, align 4
+  ret i32* %arrayidx
+}
+; CHECK: @stwux
+; CHECK: %entry
+; CHECK-NEXT: sldi
+; CHECK-NEXT: stwux
+; CHECK-NEXT: blr
+
+define i8* @stbu8(i8* %base, i64 %val) nounwind {
+entry:
+  %conv = trunc i64 %val to i8
+  %arrayidx = getelementptr inbounds i8* %base, i64 16
+  store i8 %conv, i8* %arrayidx, align 1
+  ret i8* %arrayidx
+}
+; CHECK: @stbu
+; CHECK: %entry
+; CHECK-NEXT: stbu
+; CHECK-NEXT: blr
+
+define i8* @stbux8(i8* %base, i64 %val, i64 %offset) nounwind {
+entry:
+  %conv = trunc i64 %val to i8
+  %arrayidx = getelementptr inbounds i8* %base, i64 %offset
+  store i8 %conv, i8* %arrayidx, align 1
+  ret i8* %arrayidx
+}
+; CHECK: @stbux
+; CHECK: %entry
+; CHECK-NEXT: stbux
+; CHECK-NEXT: blr
+
+define i16* @sthu8(i16* %base, i64 %val) nounwind {
+entry:
+  %conv = trunc i64 %val to i16
+  %arrayidx = getelementptr inbounds i16* %base, i64 16
+  store i16 %conv, i16* %arrayidx, align 2
+  ret i16* %arrayidx
+}
+; CHECK: @sthu
+; CHECK: %entry
+; CHECK-NEXT: sthu
+; CHECK-NEXT: blr
+
+define i16* @sthux8(i16* %base, i64 %val, i64 %offset) nounwind {
+entry:
+  %conv = trunc i64 %val to i16
+  %arrayidx = getelementptr inbounds i16* %base, i64 %offset
+  store i16 %conv, i16* %arrayidx, align 2
+  ret i16* %arrayidx
+}
+; CHECK: @sthux
+; CHECK: %entry
+; CHECK-NEXT: sldi
+; CHECK-NEXT: sthux
+; CHECK-NEXT: blr
+
+define i32* @stwu8(i32* %base, i64 %val) nounwind {
+entry:
+  %conv = trunc i64 %val to i32
+  %arrayidx = getelementptr inbounds i32* %base, i64 16
+  store i32 %conv, i32* %arrayidx, align 4
+  ret i32* %arrayidx
+}
+; CHECK: @stwu
+; CHECK: %entry
+; CHECK-NEXT: stwu
+; CHECK-NEXT: blr
+
+define i32* @stwux8(i32* %base, i64 %val, i64 %offset) nounwind {
+entry:
+  %conv = trunc i64 %val to i32
+  %arrayidx = getelementptr inbounds i32* %base, i64 %offset
+  store i32 %conv, i32* %arrayidx, align 4
+  ret i32* %arrayidx
+}
+; CHECK: @stwux
+; CHECK: %entry
+; CHECK-NEXT: sldi
+; CHECK-NEXT: stwux
+; CHECK-NEXT: blr
+
+define i64* @stdu(i64* %base, i64 %val) nounwind {
+entry:
+  %arrayidx = getelementptr inbounds i64* %base, i64 16
+  store i64 %val, i64* %arrayidx, align 8
+  ret i64* %arrayidx
+}
+; CHECK: @stdu
+; CHECK: %entry
+; CHECK-NEXT: stdu
+; CHECK-NEXT: blr
+
+define i64* @stdux(i64* %base, i64 %val, i64 %offset) nounwind {
+entry:
+  %arrayidx = getelementptr inbounds i64* %base, i64 %offset
+  store i64 %val, i64* %arrayidx, align 8
+  ret i64* %arrayidx
+}
+; CHECK: @stdux
+; CHECK: %entry
+; CHECK-NEXT: sldi
+; CHECK-NEXT: stdux
+; CHECK-NEXT: blr
+