[llvm] 9e7782d - [LV,LAA] Add tests where RT checks are known false after expansion.
Florian Hahn via llvm-commits
llvm-commits at lists.llvm.org
Sat Jul 26 06:19:37 PDT 2025
Author: Florian Hahn
Date: 2025-07-26T14:17:35+01:00
New Revision: 9e7782db73c05c369053d44e4ffbbd2089328e8b
URL: https://github.com/llvm/llvm-project/commit/9e7782db73c05c369053d44e4ffbbd2089328e8b
DIFF: https://github.com/llvm/llvm-project/commit/9e7782db73c05c369053d44e4ffbbd2089328e8b.diff
LOG: [LV,LAA] Add tests where RT checks are known false after expansion.
Added:
llvm/test/Analysis/LoopAccessAnalysis/runtime-check-known-true.ll
llvm/test/Transforms/LoopVectorize/runtime-check-known-true.ll
Modified:
Removed:
################################################################################
diff --git a/llvm/test/Analysis/LoopAccessAnalysis/runtime-check-known-true.ll b/llvm/test/Analysis/LoopAccessAnalysis/runtime-check-known-true.ll
new file mode 100644
index 0000000000000..30c80880024bb
--- /dev/null
+++ b/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
+}
diff --git a/llvm/test/Transforms/LoopVectorize/runtime-check-known-true.ll b/llvm/test/Transforms/LoopVectorize/runtime-check-known-true.ll
new file mode 100644
index 0000000000000..fabd1d4d15f29
--- /dev/null
+++ b/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
+}
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