forked from OSchip/llvm-project
[Tests] Add a few more tests for LoopPredication w/invariant loads
Making sure to cover an important legality cornercase. llvm-svn: 358439
This commit is contained in:
Philip Reames
parent
4f21f5f5ce
commit
af808ee2ee
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@ -65,8 +65,8 @@ exit:
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ret i32 %result
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}
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define i32 @invariant_load(i32* %array, i32* %length, i32 %n) {
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; CHECK-LABEL: @invariant_load(
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define i32 @invariant_load_guard_limit(i32* %array, i32* %length, i32 %n) {
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; CHECK-LABEL: @invariant_load_guard_limit(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: [[TMP5:%.*]] = icmp eq i32 [[N:%.*]], 0
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; CHECK-NEXT: br i1 [[TMP5]], label [[EXIT:%.*]], label [[LOOP_PREHEADER:%.*]]
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@ -124,6 +124,131 @@ exit:
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ret i32 %result
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}
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; This is a case where moving the load which provides the limit for the latch
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; would be invalid, so we can't preform the tempting transform. Loading the
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; latch limit may fault since we could always fail the guard.
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define i32 @neg_invariant_load_latch_limit(i32* %array, i32* %length, i32 %n) {
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; CHECK-LABEL: @neg_invariant_load_latch_limit(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: [[TMP5:%.*]] = icmp eq i32 [[N:%.*]], 0
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; CHECK-NEXT: br i1 [[TMP5]], label [[EXIT:%.*]], label [[LOOP_PREHEADER:%.*]]
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; CHECK: loop.preheader:
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; CHECK-NEXT: br label [[LOOP:%.*]]
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; CHECK: loop:
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; CHECK-NEXT: [[LOOP_ACC:%.*]] = phi i32 [ [[LOOP_ACC_NEXT:%.*]], [[LOOP]] ], [ 0, [[LOOP_PREHEADER]] ]
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; CHECK-NEXT: [[I:%.*]] = phi i32 [ [[I_NEXT:%.*]], [[LOOP]] ], [ 0, [[LOOP_PREHEADER]] ]
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; CHECK-NEXT: [[UNKNOWN:%.*]] = load volatile i1, i1* @UNKNOWN
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; CHECK-NEXT: call void (i1, ...) @llvm.experimental.guard(i1 [[UNKNOWN]]) [ "deopt"() ]
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; CHECK-NEXT: [[WITHIN_BOUNDS:%.*]] = icmp ult i32 [[I]], [[N]]
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; CHECK-NEXT: call void (i1, ...) @llvm.experimental.guard(i1 [[WITHIN_BOUNDS]], i32 9) [ "deopt"() ]
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; CHECK-NEXT: [[I_I64:%.*]] = zext i32 [[I]] to i64
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; CHECK-NEXT: [[ARRAY_I_PTR:%.*]] = getelementptr inbounds i32, i32* [[ARRAY:%.*]], i64 [[I_I64]]
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; CHECK-NEXT: [[ARRAY_I:%.*]] = load i32, i32* [[ARRAY_I_PTR]], align 4
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; CHECK-NEXT: [[LOOP_ACC_NEXT]] = add i32 [[LOOP_ACC]], [[ARRAY_I]]
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; CHECK-NEXT: [[I_NEXT]] = add nuw i32 [[I]], 1
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; CHECK-NEXT: [[LEN:%.*]] = load i32, i32* [[LENGTH:%.*]], align 4, !invariant.load !0
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; CHECK-NEXT: [[CONTINUE:%.*]] = icmp ult i32 [[I_NEXT]], [[LEN]]
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; CHECK-NEXT: br i1 [[CONTINUE]], label [[LOOP]], label [[EXIT_LOOPEXIT:%.*]]
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; CHECK: exit.loopexit:
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; CHECK-NEXT: [[LOOP_ACC_NEXT_LCSSA:%.*]] = phi i32 [ [[LOOP_ACC_NEXT]], [[LOOP]] ]
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; CHECK-NEXT: br label [[EXIT]]
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; CHECK: exit:
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; CHECK-NEXT: [[RESULT:%.*]] = phi i32 [ 0, [[ENTRY:%.*]] ], [ [[LOOP_ACC_NEXT_LCSSA]], [[EXIT_LOOPEXIT]] ]
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; CHECK-NEXT: ret i32 [[RESULT]]
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;
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entry:
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%tmp5 = icmp eq i32 %n, 0
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br i1 %tmp5, label %exit, label %loop.preheader
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loop.preheader:
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br label %loop
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loop:
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%loop.acc = phi i32 [ %loop.acc.next, %loop ], [ 0, %loop.preheader ]
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%i = phi i32 [ %i.next, %loop ], [ 0, %loop.preheader ]
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%unknown = load volatile i1, i1* @UNKNOWN
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call void (i1, ...) @llvm.experimental.guard(i1 %unknown) [ "deopt"() ]
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%within.bounds = icmp ult i32 %i, %n
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call void (i1, ...) @llvm.experimental.guard(i1 %within.bounds, i32 9) [ "deopt"() ]
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%i.i64 = zext i32 %i to i64
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%array.i.ptr = getelementptr inbounds i32, i32* %array, i64 %i.i64
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%array.i = load i32, i32* %array.i.ptr, align 4
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%loop.acc.next = add i32 %loop.acc, %array.i
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%i.next = add nuw i32 %i, 1
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%len = load i32, i32* %length, align 4, !invariant.load !{}
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%continue = icmp ult i32 %i.next, %len
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br i1 %continue, label %loop, label %exit
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exit:
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%result = phi i32 [ 0, %entry ], [ %loop.acc.next, %loop ]
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ret i32 %result
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}
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define i32 @invariant_load_latch_limit(i32* %array,
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; CHECK-LABEL: @invariant_load_latch_limit(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: [[TMP5:%.*]] = icmp eq i32 [[N:%.*]], 0
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; CHECK-NEXT: br i1 [[TMP5]], label [[EXIT:%.*]], label [[LOOP_PREHEADER:%.*]]
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; CHECK: loop.preheader:
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; CHECK-NEXT: br label [[LOOP:%.*]]
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; CHECK: loop:
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; CHECK-NEXT: [[LOOP_ACC:%.*]] = phi i32 [ [[LOOP_ACC_NEXT:%.*]], [[LOOP]] ], [ 0, [[LOOP_PREHEADER]] ]
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; CHECK-NEXT: [[I:%.*]] = phi i32 [ [[I_NEXT:%.*]], [[LOOP]] ], [ 0, [[LOOP_PREHEADER]] ]
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; CHECK-NEXT: [[UNKNOWN:%.*]] = load volatile i1, i1* @UNKNOWN
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; CHECK-NEXT: call void (i1, ...) @llvm.experimental.guard(i1 [[UNKNOWN]]) [ "deopt"() ]
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; CHECK-NEXT: [[WITHIN_BOUNDS:%.*]] = icmp ult i32 [[I]], [[N]]
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; CHECK-NEXT: call void (i1, ...) @llvm.experimental.guard(i1 [[WITHIN_BOUNDS]], i32 9) [ "deopt"() ]
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; CHECK-NEXT: [[I_I64:%.*]] = zext i32 [[I]] to i64
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; CHECK-NEXT: [[ARRAY_I_PTR:%.*]] = getelementptr inbounds i32, i32* [[ARRAY:%.*]], i64 [[I_I64]]
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; CHECK-NEXT: [[ARRAY_I:%.*]] = load i32, i32* [[ARRAY_I_PTR]], align 4
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; CHECK-NEXT: [[LOOP_ACC_NEXT]] = add i32 [[LOOP_ACC]], [[ARRAY_I]]
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; CHECK-NEXT: [[I_NEXT]] = add nuw i32 [[I]], 1
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; CHECK-NEXT: [[LEN:%.*]] = load i32, i32* [[LENGTH:%.*]], align 4, !invariant.load !0
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; CHECK-NEXT: [[CONTINUE:%.*]] = icmp ult i32 [[I_NEXT]], [[LEN]]
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; CHECK-NEXT: br i1 [[CONTINUE]], label [[LOOP]], label [[EXIT_LOOPEXIT:%.*]]
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; CHECK: exit.loopexit:
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; CHECK-NEXT: [[LOOP_ACC_NEXT_LCSSA:%.*]] = phi i32 [ [[LOOP_ACC_NEXT]], [[LOOP]] ]
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; CHECK-NEXT: br label [[EXIT]]
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; CHECK: exit:
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; CHECK-NEXT: [[RESULT:%.*]] = phi i32 [ 0, [[ENTRY:%.*]] ], [ [[LOOP_ACC_NEXT_LCSSA]], [[EXIT_LOOPEXIT]] ]
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; CHECK-NEXT: ret i32 [[RESULT]]
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;
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i32* dereferenceable(4) %length,
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i32 %n) {
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entry:
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%tmp5 = icmp eq i32 %n, 0
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br i1 %tmp5, label %exit, label %loop.preheader
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loop.preheader:
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br label %loop
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loop:
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%loop.acc = phi i32 [ %loop.acc.next, %loop ], [ 0, %loop.preheader ]
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%i = phi i32 [ %i.next, %loop ], [ 0, %loop.preheader ]
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%unknown = load volatile i1, i1* @UNKNOWN
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call void (i1, ...) @llvm.experimental.guard(i1 %unknown) [ "deopt"() ]
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%within.bounds = icmp ult i32 %i, %n
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call void (i1, ...) @llvm.experimental.guard(i1 %within.bounds, i32 9) [ "deopt"() ]
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%i.i64 = zext i32 %i to i64
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%array.i.ptr = getelementptr inbounds i32, i32* %array, i64 %i.i64
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%array.i = load i32, i32* %array.i.ptr, align 4
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%loop.acc.next = add i32 %loop.acc, %array.i
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%i.next = add nuw i32 %i, 1
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%len = load i32, i32* %length, align 4, !invariant.load !{}
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%continue = icmp ult i32 %i.next, %len
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br i1 %continue, label %loop, label %exit
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exit:
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%result = phi i32 [ 0, %entry ], [ %loop.acc.next, %loop ]
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ret i32 %result
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}
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@Length = external constant i32
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define i32 @constant_memory(i32* %array, i32 %n) {
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