[InstCombine] minimize test case and use FileCheck

llvm-svn: 271805

llvm/test/Transforms/InstCombine/signed-comparison.ll

@@ -1,28 +1,14 @@
-; RUN: opt < %s -instcombine -S > %t
-; RUN: not grep zext %t
-; RUN: not grep slt %t
-; RUN: grep "icmp ult" %t
+; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
+; RUN: opt < %s -instcombine -S | FileCheck %s
 
-; Instcombine should convert the zext+slt into a simple ult.
+; Convert the zext+slt into a simple ult.
 
-define void @foo(double* %p) nounwind {
-entry:
-	br label %bb
-
-bb:
-	%indvar = phi i64 [ 0, %entry ], [ %indvar.next, %bb ]
-	%t0 = and i64 %indvar, 65535
-	%t1 = getelementptr double, double* %p, i64 %t0
-	%t2 = load double, double* %t1, align 8
-	%t3 = fmul double %t2, 2.2
-	store double %t3, double* %t1, align 8
-	%i.04 = trunc i64 %indvar to i16
-	%t4 = add i16 %i.04, 1
-	%t5 = zext i16 %t4 to i32
-	%t6 = icmp slt i32 %t5, 500
-	%indvar.next = add i64 %indvar, 1
-	br i1 %t6, label %bb, label %return
-
-return:
-	ret void
+define i1 @foo(i16 %t4) {
+; CHECK-LABEL: @foo(
+; CHECK-NEXT:    [[T6:%.*]] = icmp ult i16 %t4, 500
+; CHECK-NEXT:    ret i1 [[T6]]
+;
+  %t5 = zext i16 %t4 to i32
+  %t6 = icmp slt i32 %t5, 500
+  ret i1 %t6
 }