[PATCH] D20905: Only attempt to detect AVG if SSE2 is available

[Dimitry Andric via llvm-commits]

dim updated this revision to Diff 59378.
dim added a comment.

- Removed else after return
- More test case minimization, and added FileCheck


http://reviews.llvm.org/D20905

Files:
  lib/Target/X86/X86ISelLowering.cpp
  test/CodeGen/X86/pr27973.ll

Index: test/CodeGen/X86/pr27973.ll
===================================================================
--- /dev/null
+++ test/CodeGen/X86/pr27973.ll
@@ -0,0 +1,32 @@
+; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
+; REQUIRES: asserts
+; RUN: llc < %s -mtriple=x86_64-unknown-unknown -mattr=-sse2 | FileCheck %s
+
+define <16 x i8> @fn1() {
+; CHECK-LABEL: fn1:
+; CHECK:       # BB#0:
+; CHECK-NEXT:    movb $0, 15(%rdi)
+; CHECK-NEXT:    movb $0, 14(%rdi)
+; CHECK-NEXT:    movb $0, 13(%rdi)
+; CHECK-NEXT:    movb $0, 12(%rdi)
+; CHECK-NEXT:    movb $0, 11(%rdi)
+; CHECK-NEXT:    movb $0, 10(%rdi)
+; CHECK-NEXT:    movb $0, 9(%rdi)
+; CHECK-NEXT:    movb $0, 8(%rdi)
+; CHECK-NEXT:    movb $0, 7(%rdi)
+; CHECK-NEXT:    movb $0, 6(%rdi)
+; CHECK-NEXT:    movb $0, 5(%rdi)
+; CHECK-NEXT:    movb $0, 4(%rdi)
+; CHECK-NEXT:    movb $0, 3(%rdi)
+; CHECK-NEXT:    movb $0, 2(%rdi)
+; CHECK-NEXT:    movb $0, 1(%rdi)
+; CHECK-NEXT:    movb $0, (%rdi)
+; CHECK-NEXT:    movq %rdi, %rax
+; CHECK-NEXT:    retq
+;
+  %t0 = zext <16 x i8> zeroinitializer to <16 x i32>
+  %t1 = add nuw nsw <16 x i32> %t0, <i32 1, i32 1, i32 1, i32 1, i32 1, i32 1, i32 1, i32 1, i32 1, i32 1, i32 1, i32 1, i32 1, i32 1, i32 1, i32 1>
+  %t2 = lshr <16 x i32> %t1, <i32 1, i32 1, i32 1, i32 1, i32 1, i32 1, i32 1, i32 1, i32 1, i32 1, i32 1, i32 1, i32 1, i32 1, i32 1, i32 1>
+  %t3 = trunc <16 x i32> %t2 to <16 x i8>
+  ret <16 x i8> %t3
+}
Index: lib/Target/X86/X86ISelLowering.cpp
===================================================================
--- lib/Target/X86/X86ISelLowering.cpp
+++ lib/Target/X86/X86ISelLowering.cpp
@@ -27842,6 +27842,8 @@
   if (InScalarVT.getSizeInBits() <= ScalarVT.getSizeInBits())
     return SDValue();
 
+  if (!Subtarget.hasSSE2())
+    return SDValue();
   if (Subtarget.hasAVX512()) {
     if (VT.getSizeInBits() > 512)
       return SDValue();


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