[Test] Simplify test by removing unneeded variable

Author: xortator

llvm/test/Transforms/IndVarSimplify/predicated_ranges.ll

@@ -3,48 +3,38 @@
 ; RUN: opt -passes=indvars -S < %s | FileCheck %s
 
 ; TODO: should be able to remove the range check basing on the following facts:
-; 0 <= len <= MAX_INT, start ult len, therefore
-;   0 <= start < MAX_INT [1];
+; 0 <= len <= MAX_INT [1];
 ; iv starts from len and goes down stopping at zero and [1], therefore
 ;   0 <= iv <= len [2];
 ; 3. In range_check_block, iv != 0 and [2], therefore
 ;   1 <= iv <= len [3];
 ; 4. iv.next = iv - 1 and [3], therefore
 ;   0 <= iv.next < len.
-define void @test_predicated_simple(i32 %start, i32* %p, i32* %arr) {
+define void @test_predicated_simple(i32* %p, i32* %arr) {
 ; CHECK-LABEL: @test_predicated_simple(
-; CHECK-NEXT:  entry:
-; CHECK-NEXT:    [[LEN:%.*]] = load i32, i32* [[P:%.*]], align 4, !range !0
-; CHECK-NEXT:    [[GUARD_COND:%.*]] = icmp ult i32 [[START:%.*]], [[LEN]]
-; CHECK-NEXT:    br i1 [[GUARD_COND]], label [[PREHEADER:%.*]], label [[FAIL:%.*]]
-; CHECK:       preheader:
+; CHECK-NEXT:  preheader:
+; CHECK-NEXT:    [[LEN:%.*]] = load i32, i32* [[P:%.*]], align 4, [[RNG0:!range !.*]]
 ; CHECK-NEXT:    br label [[LOOP:%.*]]
 ; CHECK:       loop:
-; CHECK-NEXT:    [[IV:%.*]] = phi i32 [ [[LEN]], [[PREHEADER]] ], [ [[IV_NEXT:%.*]], [[BACKEDGE:%.*]] ]
+; CHECK-NEXT:    [[IV:%.*]] = phi i32 [ [[LEN]], [[PREHEADER:%.*]] ], [ [[IV_NEXT:%.*]], [[BACKEDGE:%.*]] ]
 ; CHECK-NEXT:    [[ZERO_COND:%.*]] = icmp eq i32 [[IV]], 0
 ; CHECK-NEXT:    br i1 [[ZERO_COND]], label [[EXIT:%.*]], label [[RANGE_CHECK_BLOCK:%.*]]
 ; CHECK:       range_check_block:
 ; CHECK-NEXT:    [[IV_NEXT]] = sub i32 [[IV]], 1
 ; CHECK-NEXT:    [[RANGE_CHECK:%.*]] = icmp ult i32 [[IV_NEXT]], [[LEN]]
-; CHECK-NEXT:    br i1 [[RANGE_CHECK]], label [[BACKEDGE]], label [[FAIL_LOOPEXIT:%.*]]
+; CHECK-NEXT:    br i1 [[RANGE_CHECK]], label [[BACKEDGE]], label [[FAIL:%.*]]
 ; CHECK:       backedge:
 ; CHECK-NEXT:    [[EL_PTR:%.*]] = getelementptr i32, i32* [[P]], i32 [[IV]]
 ; CHECK-NEXT:    [[EL:%.*]] = load i32, i32* [[EL_PTR]], align 4
 ; CHECK-NEXT:    [[LOOP_COND:%.*]] = icmp eq i32 [[EL]], 0
 ; CHECK-NEXT:    br i1 [[LOOP_COND]], label [[LOOP]], label [[EXIT]]
 ; CHECK:       exit:
 ; CHECK-NEXT:    ret void
-; CHECK:       fail.loopexit:
-; CHECK-NEXT:    br label [[FAIL]]
 ; CHECK:       fail:
 ; CHECK-NEXT:    unreachable
 ;
-entry:
-  %len = load i32, i32* %p, !range !0
-  %guard_cond = icmp ult i32 %start, %len
-  br i1 %guard_cond, label %preheader, label %fail
-
 preheader:
+  %len = load i32, i32* %p, !range !0
   br label %loop
 
 loop: