[PATCH] D103057: [SystemZ] Return true from preferZeroCompareBranch()

[Jonas Paulsson via Phabricator via llvm-commits]

This revision was automatically updated to reflect the committed changes.
Closed by commit rGe77cb4ae63e9: [SystemZ] Return true from preferZeroCompareBranch(). (authored by jonpa).

Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D103057/new/

https://reviews.llvm.org/D103057

Files:
  llvm/lib/Target/SystemZ/SystemZISelLowering.h
  llvm/test/CodeGen/SystemZ/codegenprepare-form-OF-ops.ll


Index: llvm/test/CodeGen/SystemZ/codegenprepare-form-OF-ops.ll
===================================================================
--- llvm/test/CodeGen/SystemZ/codegenprepare-form-OF-ops.ll
+++ llvm/test/CodeGen/SystemZ/codegenprepare-form-OF-ops.ll
@@ -52,3 +52,41 @@
   %tmp12 = select i1 %tmp10, i64 %tmp11, i64 %arg
   ret i64 %tmp12
 }
+
+define i32 @optbranch_32(i32 %Arg) {
+; CHECK-LABEL: optbranch_32:
+; CHECK:        alhsik	%r2, %r2, 1
+; CHECK-NEXT:   bler	%r14
+; CHECK-NEXT:   .LBB4_1:
+; CHECK-NEXT: 	lhi	%r2, -1
+; CHECK-NEXT: 	br	%r14
+bb:
+  %i1 = icmp eq i32 %Arg, -1
+  br i1 %i1, label %bb2, label %bb3
+
+bb2:
+  ret i32 -1
+
+bb3:
+  %i4 = add nuw i32 %Arg, 1
+  ret i32 %i4
+}
+
+define i64 @optbranch_64(i64 %Arg) {
+; CHECK-LABEL: optbranch_64:
+; CHECK:        alghsik	%r2, %r2, 1
+; CHECK-NEXT:   bler	%r14
+; CHECK-NEXT:   .LBB5_1:
+; CHECK-NEXT: 	lghi	%r2, -1
+; CHECK-NEXT: 	br	%r14
+bb:
+  %i1 = icmp eq i64 %Arg, -1
+  br i1 %i1, label %bb2, label %bb3
+
+bb2:
+  ret i64 -1
+
+bb3:
+  %i4 = add nuw i64 %Arg, 1
+  ret i64 %i4
+}
Index: llvm/lib/Target/SystemZ/SystemZISelLowering.h
===================================================================
--- llvm/lib/Target/SystemZ/SystemZISelLowering.h
+++ llvm/lib/Target/SystemZ/SystemZISelLowering.h
@@ -423,6 +423,7 @@
     return TargetLoweringBase::getPreferredVectorAction(VT);
   }
   bool isCheapToSpeculateCtlz() const override { return true; }
+  bool preferZeroCompareBranch() const override { return true; }
   EVT getSetCCResultType(const DataLayout &DL, LLVMContext &,
                          EVT) const override;
   bool isFMAFasterThanFMulAndFAdd(const MachineFunction &MF,


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