[PATCH] D11359: [AArch64] Change EON pattern to match more often.

[Geoff Berry]

gberry updated this revision to Diff 30177.
gberry added a comment.

Fix test CHECK-LABELs to be more discriminating.


http://reviews.llvm.org/D11359

Files:
  lib/Target/AArch64/AArch64InstrInfo.td
  test/CodeGen/AArch64/eon.ll

Index: test/CodeGen/AArch64/eon.ll
===================================================================
--- /dev/null
+++ test/CodeGen/AArch64/eon.ll
@@ -0,0 +1,30 @@
+; RUN: llc -mtriple=aarch64-none-linux-gnu < %s | FileCheck %s
+
+; Check that the eon instruction is generated instead of eor,movn
+define i64 @test1(i64 %a, i64 %b, i64 %c) {
+; CHECK-LABEL: test1:
+; CHECK: eon
+; CHECK: ret
+entry:
+  %shl = shl i64 %b, 4
+  %neg = xor i64 %a, -1
+  %xor = xor i64 %shl, %neg
+  ret i64 %xor
+}
+
+; Same check with mutliple uses of %neg
+define i64 @test2(i64 %a, i64 %b, i64 %c) {
+; CHECK-LABEL: test2:
+; CHECK: eon
+; CHECK: eon
+; CHECK: lsl
+; CHECK: ret
+entry:
+  %shl = shl i64 %b, 4
+  %neg = xor i64 %shl, -1
+  %xor = xor i64 %neg, %a
+  %xor1 = xor i64 %c, %neg
+  %shl2 = shl i64 %xor, %xor1
+  ret i64 %shl2
+}
+
Index: lib/Target/AArch64/AArch64InstrInfo.td
===================================================================
--- lib/Target/AArch64/AArch64InstrInfo.td
+++ lib/Target/AArch64/AArch64InstrInfo.td
@@ -841,7 +841,7 @@
 defm BIC  : LogicalReg<0b00, 1, "bic",
                        BinOpFrag<(and node:$LHS, (not node:$RHS))>>;
 defm EON  : LogicalReg<0b10, 1, "eon",
-                       BinOpFrag<(xor node:$LHS, (not node:$RHS))>>;
+                       BinOpFrag<(not (xor node:$LHS, node:$RHS))>>;
 defm EOR  : LogicalReg<0b10, 0, "eor", xor>;
 defm ORN  : LogicalReg<0b01, 1, "orn",
                        BinOpFrag<(or node:$LHS, (not node:$RHS))>>;


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