[AArch64] allow and-not-compare transform to form 'bics'

This target hook was added with D19087:
https://reviews.llvm.org/D19087

Differential Revision: https://reviews.llvm.org/D27221

llvm-svn: 288206

diff --git a/llvm/lib/Target/AArch64/AArch64ISelLowering.h b/llvm/lib/Target/AArch64/AArch64ISelLowering.h
index 7867d7c..054ccc3 100644 (file)
--- a/llvm/lib/Target/AArch64/AArch64ISelLowering.h
+++ b/llvm/lib/Target/AArch64/AArch64ISelLowering.h
@@ -412,6 +412,11 @@ public:
     return true;
   }
 
+  bool hasAndNotCompare(SDValue) const override {
+    // 'bics'
+    return true;
+  }
+
   bool hasBitPreservingFPLogic(EVT VT) const override {
     // FIXME: Is this always true? It should be true for vectors at least.
     return VT == MVT::f32 || VT == MVT::f64;

diff --git a/llvm/test/CodeGen/AArch64/bics.ll b/llvm/test/CodeGen/AArch64/bics.ll
index 1c0c079..53aa28a 100644 (file)
--- a/llvm/test/CodeGen/AArch64/bics.ll
+++ b/llvm/test/CodeGen/AArch64/bics.ll
@@ -13,13 +13,10 @@ define i1 @andn_cmp(i32 %x, i32 %y) {
   ret i1 %cmp
 }
 
-; FIXME: Recognize a disguised bics.
-
 define i1 @and_cmp(i32 %x, i32 %y) {
 ; CHECK-LABEL: and_cmp:
 ; CHECK:       // BB#0:
-; CHECK-NEXT:    and w8, w0, w1
-; CHECK-NEXT:    cmp w8, w1
+; CHECK-NEXT:    bics wzr, w1, w0
 ; CHECK-NEXT:    cset w0, eq
 ; CHECK-NEXT:    ret
 ;
@@ -32,8 +29,7 @@ define i1 @and_cmp_const(i32 %x) {
 ; CHECK-LABEL: and_cmp_const:
 ; CHECK:       // BB#0:
 ; CHECK-NEXT:    mov w8, #43
-; CHECK-NEXT:    and w8, w0, w8
-; CHECK-NEXT:    cmp w8, #43
+; CHECK-NEXT:    bics wzr, w8, w0
 ; CHECK-NEXT:    cset w0, eq
 ; CHECK-NEXT:    ret
 ;