[PATCH] D26713: [ppc] Legalize the load of MVT::v4i8 into VSX register

[Guozhi Wei via llvm-commits]

Carrot updated this revision to Diff 78424.
Carrot marked an inline comment as done.

https://reviews.llvm.org/D26713

Files:
  lib/Target/PowerPC/PPCISelLowering.cpp
  test/Transforms/LoopVectorize/PowerPC/pr30990.ll


Index: test/Transforms/LoopVectorize/PowerPC/pr30990.ll
===================================================================
--- test/Transforms/LoopVectorize/PowerPC/pr30990.ll
+++ test/Transforms/LoopVectorize/PowerPC/pr30990.ll
@@ -0,0 +1,36 @@
+; RUN: opt < %s -loop-vectorize -mcpu=pwr8 -mattr=+vsx -force-vector-interleave=1 -vectorizer-maximize-bandwidth=0 -S | FileCheck %s
+
+target triple = "powerpc64-unknown-linux-gnu"
+
+define signext i32 @foo(i8* readonly %ptr, i32 signext %l) {
+entry:
+  %idx.ext = sext i32 %l to i64
+  %add.ptr = getelementptr inbounds i8, i8* %ptr, i64 %idx.ext
+  %cmp7 = icmp sgt i32 %l, 0
+  br i1 %cmp7, label %while.body.preheader, label %while.end
+
+while.body.preheader:                             ; preds = %entry
+  br label %while.body
+
+while.body:                                       ; preds = %while.body.preheader, %while.body
+  %count.09 = phi i32 [ %add, %while.body ], [ 0, %while.body.preheader ]
+  %ptr.addr.08 = phi i8* [ %incdec.ptr, %while.body ], [ %ptr, %while.body.preheader ]
+  %0 = load i8, i8* %ptr.addr.08, align 1
+  %cmp1 = icmp slt i8 %0, -64
+  %cond = zext i1 %cmp1 to i32
+  %add = add nsw i32 %cond, %count.09
+  %incdec.ptr = getelementptr inbounds i8, i8* %ptr.addr.08, i64 1
+  %cmp = icmp ult i8* %incdec.ptr, %add.ptr
+  br i1 %cmp, label %while.body, label %while.end.loopexit
+
+while.end.loopexit:                               ; preds = %while.body
+  %add.lcssa = phi i32 [ %add, %while.body ]
+  br label %while.end
+
+while.end:                                        ; preds = %while.end.loopexit, %entry
+  %count.0.lcssa = phi i32 [ 0, %entry ], [ %add.lcssa, %while.end.loopexit ]
+  ret i32 %count.0.lcssa
+
+; CHECK: load <4 x i8>
+; CHECK: icmp slt <4 x i8>
+}
Index: lib/Target/PowerPC/PPCISelLowering.cpp
===================================================================
--- lib/Target/PowerPC/PPCISelLowering.cpp
+++ lib/Target/PowerPC/PPCISelLowering.cpp
@@ -676,6 +676,11 @@
       setOperationAction(ISD::FABS, MVT::v2f64, Legal);
 
       addRegisterClass(MVT::v2i64, &PPC::VSRCRegClass);
+
+      // Tell TTI that loading v4i8 in VSX is cheap.
+      // Legalization will eliminate the illegal type, and finally LXSIWAX can
+      // be generated.
+      setLoadExtAction(ISD::EXTLOAD, MVT::v16i8, MVT::v4i8, Custom);
     }
 
     if (Subtarget.hasP8Altivec()) {


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