[PowerPC] Remove LE patterns matching generic stores/loads to VSX permuting ops

This patch corresponds to:
https://reviews.llvm.org/D21409

The LXVD2X, LXVW4X, STXVD2X and STXVW4X instructions permute the two doublewords
in the vector register when in little-endian mode. Custom code ensures that the
necessary swaps are inserted for these. This patch simply removes the possibilty
that a load/store node will match one of these instructions in the SDAG as that
would not insert the necessary swaps.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@282144 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/lib/Target/PowerPC/PPCInstrVSX.td b/lib/Target/PowerPC/PPCInstrVSX.td
index 111d8fc..7d1cf8e 100644 (file)
--- a/lib/Target/PowerPC/PPCInstrVSX.td
+++ b/lib/Target/PowerPC/PPCInstrVSX.td
@@ -131,10 +131,12 @@ let Uses = [RM] in {
                         [(store f64:$XT, xoaddr:$dst)]>;
 
     let Predicates = [HasVSX, HasOnlySwappingMemOps] in {
+    // The behaviour of this instruction is endianness-specific so we provide no
+    // pattern to match it without considering endianness.
     def STXVD2X : XX1Form<31, 972,
                          (outs), (ins vsrc:$XT, memrr:$dst),
                          "stxvd2x $XT, $dst", IIC_LdStSTFD,
-                         [(store v2f64:$XT, xoaddr:$dst)]>;
+                         []>;
 
     def STXVW4X : XX1Form<31, 908,
                          (outs), (ins vsrc:$XT, memrr:$dst),
@@ -953,19 +955,22 @@ def : Pat<(v2f64 (PPCuvec2fp v4i32:$C, 1)),
 
 // Loads.
 let Predicates = [HasVSX, HasOnlySwappingMemOps] in {
-  def : Pat<(v2f64 (load xoaddr:$src)), (LXVD2X xoaddr:$src)>;
-  def : Pat<(v2i64 (load xoaddr:$src)), (LXVD2X xoaddr:$src)>;
-  def : Pat<(v4i32 (load xoaddr:$src)), (LXVW4X xoaddr:$src)>;
   def : Pat<(v2f64 (PPClxvd2x xoaddr:$src)), (LXVD2X xoaddr:$src)>;
 
   // Stores.
   def : Pat<(int_ppc_vsx_stxvd2x v2f64:$rS, xoaddr:$dst),
             (STXVD2X $rS, xoaddr:$dst)>;
-  def : Pat<(store v2i64:$rS, xoaddr:$dst), (STXVD2X $rS, xoaddr:$dst)>;
   def : Pat<(int_ppc_vsx_stxvw4x v4i32:$rS, xoaddr:$dst),
             (STXVW4X $rS, xoaddr:$dst)>;
   def : Pat<(PPCstxvd2x v2f64:$rS, xoaddr:$dst), (STXVD2X $rS, xoaddr:$dst)>;
 }
+let Predicates = [IsBigEndian, HasVSX, HasOnlySwappingMemOps] in {
+  def : Pat<(v2f64 (load xoaddr:$src)), (LXVD2X xoaddr:$src)>;
+  def : Pat<(v2i64 (load xoaddr:$src)), (LXVD2X xoaddr:$src)>;
+  def : Pat<(v4i32 (load xoaddr:$src)), (LXVW4X xoaddr:$src)>;
+  def : Pat<(store v2f64:$rS, xoaddr:$dst), (STXVD2X $rS, xoaddr:$dst)>;
+  def : Pat<(store v2i64:$rS, xoaddr:$dst), (STXVD2X $rS, xoaddr:$dst)>;
+}
 
 // Permutes.
 def : Pat<(v2f64 (PPCxxswapd v2f64:$src)), (XXPERMDI $src, $src, 2)>;