[LV,LAA] Add tests where RT checks are known false after expansion.

Author: fhahn

llvm/test/Analysis/LoopAccessAnalysis/runtime-check-known-true.ll

@@ -0,0 +1,50 @@
+; NOTE: Assertions have been autogenerated by utils/update_analyze_test_checks.py UTC_ARGS: --version 5
+; RUN: opt -passes='print<access-info>' -disable-output %s 2>&1 | FileCheck %s
+
+; TODO: Accesses are known completely before or after.
+define void @test_runtime_check_known_false_after_construction(ptr %start.1, ptr %start.2, ptr %end) {
+; CHECK-LABEL: 'test_runtime_check_known_false_after_construction'
+; CHECK-NEXT:    loop:
+; CHECK-NEXT:      Memory dependences are safe with run-time checks
+; CHECK-NEXT:      Dependences:
+; CHECK-NEXT:      Run-time memory checks:
+; CHECK-NEXT:      Check 0:
+; CHECK-NEXT:        Comparing group GRP0:
+; CHECK-NEXT:          %ptr.iv.1 = phi ptr [ %ptr.iv.1.next, %loop ], [ %start.1, %entry ]
+; CHECK-NEXT:        Against group GRP1:
+; CHECK-NEXT:          %ptr.iv.2 = phi ptr [ %ptr.iv.2.next, %loop ], [ %start.2.diff, %entry ]
+; CHECK-NEXT:      Grouped accesses:
+; CHECK-NEXT:        Group GRP0:
+; CHECK-NEXT:          (Low: ((-8 * ((2305843009213693951 * (8 + (-1 * (ptrtoint ptr %start.1 to i64)) + (ptrtoint ptr %end to i64))) /u 8)) + %start.1) High: (8 + %start.1))
+; CHECK-NEXT:            Member: {%start.1,+,-8}<%loop>
+; CHECK-NEXT:        Group GRP1:
+; CHECK-NEXT:          (Low: (-8 + (-8 * ((2305843009213693951 * (8 + (-1 * (ptrtoint ptr %start.1 to i64)) + (ptrtoint ptr %end to i64))) /u 8)) + (-1 * (ptrtoint ptr %start.2 to i64)) + (ptrtoint ptr %start.1 to i64) + %start.2) High: ((-1 * (ptrtoint ptr %start.2 to i64)) + (ptrtoint ptr %start.1 to i64) + %start.2))
+; CHECK-NEXT:            Member: {(-8 + (-1 * (ptrtoint ptr %start.2 to i64)) + (ptrtoint ptr %start.1 to i64) + %start.2),+,-8}<%loop>
+; CHECK-EMPTY:
+; CHECK-NEXT:      Non vectorizable stores to invariant address were not found in loop.
+; CHECK-NEXT:      SCEV assumptions:
+; CHECK-NEXT:      Equal predicate: (zext i3 ((trunc i64 (ptrtoint ptr %end to i64) to i3) + (-1 * (trunc i64 (ptrtoint ptr %start.1 to i64) to i3))) to i64) == 0
+; CHECK-EMPTY:
+; CHECK-NEXT:      Expressions re-written:
+;
+entry:
+  %gep.start.2 = getelementptr i8, ptr %start.2, i64 8
+  %start.1.int = ptrtoint ptr %start.1 to i64
+  %start.2.int = ptrtoint ptr %gep.start.2 to i64
+  %diff = sub i64 %start.1.int, %start.2.int
+  %start.2.diff = getelementptr i8, ptr %start.2, i64 %diff
+  br label %loop
+
+loop:
+  %ptr.iv.1 = phi ptr [ %ptr.iv.1.next, %loop ], [ %start.1, %entry ]
+  %ptr.iv.2 = phi ptr [ %ptr.iv.2.next, %loop ], [ %start.2.diff, %entry ]
+  %ptr.iv.2.next = getelementptr i8, ptr %ptr.iv.2, i64 -8
+  %ptr.iv.1.next = getelementptr i8, ptr %ptr.iv.1, i64 -8
+  %l = load i64, ptr %ptr.iv.2, align 8
+  store i64 %l, ptr %ptr.iv.1, align 8
+  %ec = icmp eq ptr %ptr.iv.2, %end
+  br i1 %ec, label %exit, label %loop
+
+exit:
+  ret void
+}

llvm/test/Transforms/LoopVectorize/runtime-check-known-true.ll

@@ -0,0 +1,94 @@
+; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --check-globals none --version 5
+; RUN: opt -p loop-vectorize -force-vector-width=4 -S %s | FileCheck %s
+
+define void @test_runtime_check_known_false_after_construction(ptr %start.1, ptr %start.2, ptr %end) {
+; CHECK-LABEL: define void @test_runtime_check_known_false_after_construction(
+; CHECK-SAME: ptr [[START_1:%.*]], ptr [[START_2:%.*]], ptr [[END:%.*]]) {
+; CHECK-NEXT:  [[ENTRY:.*]]:
+; CHECK-NEXT:    [[END1:%.*]] = ptrtoint ptr [[END]] to i64
+; CHECK-NEXT:    [[GEP_START_2:%.*]] = getelementptr i8, ptr [[START_2]], i64 8
+; CHECK-NEXT:    [[START_1_INT:%.*]] = ptrtoint ptr [[START_1]] to i64
+; CHECK-NEXT:    [[START_2_INT:%.*]] = ptrtoint ptr [[GEP_START_2]] to i64
+; CHECK-NEXT:    [[DIFF:%.*]] = sub i64 [[START_1_INT]], [[START_2_INT]]
+; CHECK-NEXT:    [[START_2_DIFF:%.*]] = getelementptr i8, ptr [[START_2]], i64 [[DIFF]]
+; CHECK-NEXT:    [[TMP0:%.*]] = add i64 [[END1]], 8
+; CHECK-NEXT:    [[TMP1:%.*]] = sub i64 [[TMP0]], [[START_1_INT]]
+; CHECK-NEXT:    [[TMP2:%.*]] = mul i64 [[TMP1]], 2305843009213693951
+; CHECK-NEXT:    [[TMP3:%.*]] = lshr i64 [[TMP2]], 3
+; CHECK-NEXT:    [[TMP4:%.*]] = add nuw nsw i64 [[TMP3]], 1
+; CHECK-NEXT:    [[MIN_ITERS_CHECK:%.*]] = icmp ult i64 [[TMP4]], 4
+; CHECK-NEXT:    br i1 [[MIN_ITERS_CHECK]], label %[[SCALAR_PH:.*]], label %[[VECTOR_SCEVCHECK:.*]]
+; CHECK:       [[VECTOR_SCEVCHECK]]:
+; CHECK-NEXT:    [[TMP5:%.*]] = trunc i64 [[END1]] to i3
+; CHECK-NEXT:    [[TMP6:%.*]] = trunc i64 [[START_1_INT]] to i3
+; CHECK-NEXT:    [[TMP7:%.*]] = sub i3 [[TMP5]], [[TMP6]]
+; CHECK-NEXT:    [[TMP8:%.*]] = zext i3 [[TMP7]] to i64
+; CHECK-NEXT:    [[IDENT_CHECK:%.*]] = icmp ne i64 [[TMP8]], 0
+; CHECK-NEXT:    br i1 [[IDENT_CHECK]], label %[[SCALAR_PH]], label %[[VECTOR_MEMCHECK:.*]]
+; CHECK:       [[VECTOR_MEMCHECK]]:
+; CHECK-NEXT:    br i1 false, label %[[SCALAR_PH]], label %[[VECTOR_PH:.*]]
+; CHECK:       [[VECTOR_PH]]:
+; CHECK-NEXT:    [[N_MOD_VF:%.*]] = urem i64 [[TMP4]], 4
+; CHECK-NEXT:    [[N_VEC:%.*]] = sub i64 [[TMP4]], [[N_MOD_VF]]
+; CHECK-NEXT:    [[TMP9:%.*]] = mul i64 [[N_VEC]], -8
+; CHECK-NEXT:    [[TMP10:%.*]] = getelementptr i8, ptr [[START_1]], i64 [[TMP9]]
+; CHECK-NEXT:    [[TMP11:%.*]] = mul i64 [[N_VEC]], -8
+; CHECK-NEXT:    [[TMP12:%.*]] = getelementptr i8, ptr [[START_2_DIFF]], i64 [[TMP11]]
+; CHECK-NEXT:    br label %[[VECTOR_BODY:.*]]
+; CHECK:       [[VECTOR_BODY]]:
+; CHECK-NEXT:    [[INDEX:%.*]] = phi i64 [ 0, %[[VECTOR_PH]] ], [ [[INDEX_NEXT:%.*]], %[[VECTOR_BODY]] ]
+; CHECK-NEXT:    [[OFFSET_IDX:%.*]] = mul i64 [[INDEX]], -8
+; CHECK-NEXT:    [[NEXT_GEP:%.*]] = getelementptr i8, ptr [[START_1]], i64 [[OFFSET_IDX]]
+; CHECK-NEXT:    [[OFFSET_IDX2:%.*]] = mul i64 [[INDEX]], -8
+; CHECK-NEXT:    [[NEXT_GEP3:%.*]] = getelementptr i8, ptr [[START_2_DIFF]], i64 [[OFFSET_IDX2]]
+; CHECK-NEXT:    [[TMP13:%.*]] = getelementptr i64, ptr [[NEXT_GEP3]], i32 0
+; CHECK-NEXT:    [[TMP14:%.*]] = getelementptr i64, ptr [[TMP13]], i32 -3
+; CHECK-NEXT:    [[WIDE_LOAD:%.*]] = load <4 x i64>, ptr [[TMP14]], align 8
+; CHECK-NEXT:    [[REVERSE:%.*]] = shufflevector <4 x i64> [[WIDE_LOAD]], <4 x i64> poison, <4 x i32> <i32 3, i32 2, i32 1, i32 0>
+; CHECK-NEXT:    [[TMP15:%.*]] = getelementptr i64, ptr [[NEXT_GEP]], i32 0
+; CHECK-NEXT:    [[TMP16:%.*]] = getelementptr i64, ptr [[TMP15]], i32 -3
+; CHECK-NEXT:    [[REVERSE4:%.*]] = shufflevector <4 x i64> [[REVERSE]], <4 x i64> poison, <4 x i32> <i32 3, i32 2, i32 1, i32 0>
+; CHECK-NEXT:    store <4 x i64> [[REVERSE4]], ptr [[TMP16]], align 8
+; CHECK-NEXT:    [[INDEX_NEXT]] = add nuw i64 [[INDEX]], 4
+; CHECK-NEXT:    [[TMP17:%.*]] = icmp eq i64 [[INDEX_NEXT]], [[N_VEC]]
+; CHECK-NEXT:    br i1 [[TMP17]], label %[[MIDDLE_BLOCK:.*]], label %[[VECTOR_BODY]], !llvm.loop [[LOOP0:![0-9]+]]
+; CHECK:       [[MIDDLE_BLOCK]]:
+; CHECK-NEXT:    [[CMP_N:%.*]] = icmp eq i64 [[TMP4]], [[N_VEC]]
+; CHECK-NEXT:    br i1 [[CMP_N]], label %[[EXIT:.*]], label %[[SCALAR_PH]]
+; CHECK:       [[SCALAR_PH]]:
+; CHECK-NEXT:    [[BC_RESUME_VAL:%.*]] = phi ptr [ [[TMP10]], %[[MIDDLE_BLOCK]] ], [ [[START_1]], %[[ENTRY]] ], [ [[START_1]], %[[VECTOR_SCEVCHECK]] ], [ [[START_1]], %[[VECTOR_MEMCHECK]] ]
+; CHECK-NEXT:    [[BC_RESUME_VAL5:%.*]] = phi ptr [ [[TMP12]], %[[MIDDLE_BLOCK]] ], [ [[START_2_DIFF]], %[[ENTRY]] ], [ [[START_2_DIFF]], %[[VECTOR_SCEVCHECK]] ], [ [[START_2_DIFF]], %[[VECTOR_MEMCHECK]] ]
+; CHECK-NEXT:    br label %[[LOOP:.*]]
+; CHECK:       [[LOOP]]:
+; CHECK-NEXT:    [[PTR_IV_1:%.*]] = phi ptr [ [[PTR_IV_1_NEXT:%.*]], %[[LOOP]] ], [ [[BC_RESUME_VAL]], %[[SCALAR_PH]] ]
+; CHECK-NEXT:    [[PTR_IV_2:%.*]] = phi ptr [ [[PTR_IV_2_NEXT:%.*]], %[[LOOP]] ], [ [[BC_RESUME_VAL5]], %[[SCALAR_PH]] ]
+; CHECK-NEXT:    [[PTR_IV_2_NEXT]] = getelementptr i8, ptr [[PTR_IV_2]], i64 -8
+; CHECK-NEXT:    [[PTR_IV_1_NEXT]] = getelementptr i8, ptr [[PTR_IV_1]], i64 -8
+; CHECK-NEXT:    [[L:%.*]] = load i64, ptr [[PTR_IV_2]], align 8
+; CHECK-NEXT:    store i64 [[L]], ptr [[PTR_IV_1]], align 8
+; CHECK-NEXT:    [[EC:%.*]] = icmp eq ptr [[PTR_IV_2]], [[END]]
+; CHECK-NEXT:    br i1 [[EC]], label %[[EXIT]], label %[[LOOP]], !llvm.loop [[LOOP3:![0-9]+]]
+; CHECK:       [[EXIT]]:
+; CHECK-NEXT:    ret void
+;
+entry:
+  %gep.start.2 = getelementptr i8, ptr %start.2, i64 8
+  %start.1.int = ptrtoint ptr %start.1 to i64
+  %start.2.int = ptrtoint ptr %gep.start.2 to i64
+  %diff = sub i64 %start.1.int, %start.2.int
+  %start.2.diff = getelementptr i8, ptr %start.2, i64 %diff
+  br label %loop
+
+loop:
+  %ptr.iv.1 = phi ptr [ %ptr.iv.1.next, %loop ], [ %start.1, %entry ]
+  %ptr.iv.2 = phi ptr [ %ptr.iv.2.next, %loop ], [ %start.2.diff, %entry ]
+  %ptr.iv.2.next = getelementptr i8, ptr %ptr.iv.2, i64 -8
+  %ptr.iv.1.next = getelementptr i8, ptr %ptr.iv.1, i64 -8
+  %l = load i64, ptr %ptr.iv.2, align 8
+  store i64 %l, ptr %ptr.iv.1, align 8
+  %ec = icmp eq ptr %ptr.iv.2, %end
+  br i1 %ec, label %exit, label %loop
+
+exit:
+  ret void
+}