[llvm] 4443b37 - [LAA] Pre-commit tests exercising different types (#151091)
via llvm-commits
llvm-commits at lists.llvm.org
Mon Aug 11 02:19:13 PDT 2025
Author: Ramkumar Ramachandra
Date: 2025-08-11T10:19:10+01:00
New Revision: 4443b3787703f848ee9943b7aa199f2658680eac
URL: https://github.com/llvm/llvm-project/commit/4443b3787703f848ee9943b7aa199f2658680eac
DIFF: https://github.com/llvm/llvm-project/commit/4443b3787703f848ee9943b7aa199f2658680eac.diff
LOG: [LAA] Pre-commit tests exercising different types (#151091)
Pre-commit tests exercising different types of source/sink in
depend_diff_types.ll, in preparation to weaken the HasSameSize check in
LoopAccessAnalysis.
Co-authored-by: Igor Kirillov <igor.kirillov at arm.com>
Added:
Modified:
llvm/test/Analysis/LoopAccessAnalysis/depend_diff_types.ll
Removed:
################################################################################
diff --git a/llvm/test/Analysis/LoopAccessAnalysis/depend_
diff _types.ll b/llvm/test/Analysis/LoopAccessAnalysis/depend_
diff _types.ll
index 1bf80489b1ea0..023a8c056968f 100644
--- a/llvm/test/Analysis/LoopAccessAnalysis/depend_
diff _types.ll
+++ b/llvm/test/Analysis/LoopAccessAnalysis/depend_
diff _types.ll
@@ -262,3 +262,301 @@ loop:
exit:
ret void
}
+
+; i16 i32
+; [ . . 0 0 . . 1 1] [ 1 1 0 0 . . 1 1 ]
+; ^~~^ gep i8 = 1
+; ^ ~~ ^ iv.2 = iv + 2
+; ^ ~~~~~ ^ dependence distance = 4
+; ^ ~~~~~~~~~~~~~~~~~ ^ 8
+; ^ ~~~~~~~~~~~~~~~~ ^ 8
+; ^ ~~~~~~~~~~~~~~~~ ^ iv.next = iv + 8
+;
+; Measurements are in bytes.
+;
+; TODO: Relax the HasSameSize check; the strided accesses are
+; independent, as determined by both the source size and the sink size.
+; This test should report no dependencies.
+define void @
diff erent_type_sizes_strided_accesses_independent(ptr %dst) {
+; CHECK-LABEL: '
diff erent_type_sizes_strided_accesses_independent'
+; CHECK-NEXT: loop:
+; CHECK-NEXT: Report: unsafe dependent memory operations in loop. Use #pragma clang loop distribute(enable) to allow loop distribution to attempt to isolate the offending operations into a separate loop
+; CHECK-NEXT: Unknown data dependence.
+; CHECK-NEXT: Dependences:
+; CHECK-NEXT: Unknown:
+; CHECK-NEXT: store i16 0, ptr %gep.iv, align 2 ->
+; CHECK-NEXT: store i32 1, ptr %gep.4.iv, align 4
+; CHECK-EMPTY:
+; CHECK-NEXT: Run-time memory checks:
+; CHECK-NEXT: Grouped accesses:
+; CHECK-EMPTY:
+; CHECK-NEXT: Non vectorizable stores to invariant address were not found in loop.
+; CHECK-NEXT: SCEV assumptions:
+; CHECK-EMPTY:
+; CHECK-NEXT: Expressions re-written:
+;
+entry:
+ %gep.4 = getelementptr nuw i8, ptr %dst, i64 4
+ br label %loop
+
+loop:
+ %iv = phi i64 [ 0, %entry ], [ %iv.next, %loop ]
+ %iv.2 = add nuw nsw i64 %iv, 2
+ %gep.iv = getelementptr i8, ptr %dst, i64 %iv.2
+ store i16 0, ptr %gep.iv
+ %gep.4.iv = getelementptr i8, ptr %gep.4, i64 %iv.2
+ store i32 1, ptr %gep.4.iv
+ %iv.next = add nuw nsw i64 %iv, 8
+ %ec = icmp eq i64 %iv.next, 64
+ br i1 %ec, label %exit, label %loop
+
+exit:
+ ret void
+}
+
+
+; i16 i64
+; [ . 0 0 . 1 1 1 1] [ 1 x x 1 1 1 1 1 ]
+; ^~~^ gep i8 = 1
+; ^~~^ iv.1 = iv + 1
+; ^ ~~ ^ dependence distance = 3
+; ^ ~~~~~~~~~~~~~~~~ ^ 8
+; ^ ~~~~~~~~~~~~~~~~ ^ 8
+; ^ ~~~~~~~~~~~~~~~~ ^ iv.next = iv + 8
+;
+; TODO: Relax the HasSameSize check; this test should report a backward
+; loop-carried dependence.
+define void @
diff erent_type_sizes_strided_accesses_dependent(ptr %dst) {
+; CHECK-LABEL: '
diff erent_type_sizes_strided_accesses_dependent'
+; CHECK-NEXT: loop:
+; CHECK-NEXT: Report: unsafe dependent memory operations in loop. Use #pragma clang loop distribute(enable) to allow loop distribution to attempt to isolate the offending operations into a separate loop
+; CHECK-NEXT: Unknown data dependence.
+; CHECK-NEXT: Dependences:
+; CHECK-NEXT: Unknown:
+; CHECK-NEXT: store i16 0, ptr %gep.iv, align 2 ->
+; CHECK-NEXT: store i64 1, ptr %gep.3.iv, align 4
+; CHECK-EMPTY:
+; CHECK-NEXT: Run-time memory checks:
+; CHECK-NEXT: Grouped accesses:
+; CHECK-EMPTY:
+; CHECK-NEXT: Non vectorizable stores to invariant address were not found in loop.
+; CHECK-NEXT: SCEV assumptions:
+; CHECK-EMPTY:
+; CHECK-NEXT: Expressions re-written:
+;
+entry:
+ %gep.3 = getelementptr nuw i8, ptr %dst, i64 3
+ br label %loop
+
+loop:
+ %iv = phi i64 [ 0, %entry ], [ %iv.next, %loop ]
+ %iv.1 = add nuw nsw i64 %iv, 1
+ %gep.iv = getelementptr i8, ptr %dst, i64 %iv.1
+ store i16 0, ptr %gep.iv
+ %gep.3.iv = getelementptr i8, ptr %gep.3, i64 %iv.1
+ store i64 1, ptr %gep.3.iv
+ %iv.next = add nuw nsw i64 %iv, 8
+ %ec = icmp eq i64 %iv.next, 64
+ br i1 %ec, label %exit, label %loop
+
+exit:
+ ret void
+}
+
+; Variant of the above, where the store size exceeds the dependence
+; distance.
+define void @
diff erent_type_sizes_strided_accesses_store_size_exceeds_depdist(ptr %dst) {
+; CHECK-LABEL: '
diff erent_type_sizes_strided_accesses_store_size_exceeds_depdist'
+; CHECK-NEXT: loop:
+; CHECK-NEXT: Report: unsafe dependent memory operations in loop. Use #pragma clang loop distribute(enable) to allow loop distribution to attempt to isolate the offending operations into a separate loop
+; CHECK-NEXT: Unsafe indirect dependence.
+; CHECK-NEXT: Dependences:
+; CHECK-NEXT: IndirectUnsafe:
+; CHECK-NEXT: store i16 0, ptr %gep.iv, align 2 ->
+; CHECK-NEXT: store i128 1, ptr %gep.10.iv, align 4
+; CHECK-EMPTY:
+; CHECK-NEXT: Run-time memory checks:
+; CHECK-NEXT: Grouped accesses:
+; CHECK-EMPTY:
+; CHECK-NEXT: Non vectorizable stores to invariant address were not found in loop.
+; CHECK-NEXT: SCEV assumptions:
+; CHECK-EMPTY:
+; CHECK-NEXT: Expressions re-written:
+;
+entry:
+ %gep.10 = getelementptr nuw i8, ptr %dst, i64 10
+ br label %loop
+
+loop:
+ %iv = phi i64 [ 0, %entry ], [ %iv.next, %loop ]
+ %gep.iv = getelementptr i8, ptr %dst, i64 %iv
+ store i16 0, ptr %gep.iv
+ %gep.10.iv = getelementptr i8, ptr %gep.10, i64 %iv
+ store i128 1, ptr %gep.10.iv
+ %iv.next = add i64 %iv, 8
+ %ec = icmp eq i64 %iv.next, 64
+ br i1 %ec, label %exit, label %loop
+
+exit:
+ ret void
+}
+
+
+; Source type-size
diff ers from that of the sink, but when
+; determining backward dependence, only the source size
+; is relevant.
+; TODO: Relax the HasSameSize check; this test should report
+; BackwardVectorizable.
+define void @
diff erent_type_sizes_source_size_backwardvectorizible(ptr %dst) {
+; CHECK-LABEL: '
diff erent_type_sizes_source_size_backwardvectorizible'
+; CHECK-NEXT: loop:
+; CHECK-NEXT: Report: unsafe dependent memory operations in loop. Use #pragma clang loop distribute(enable) to allow loop distribution to attempt to isolate the offending operations into a separate loop
+; CHECK-NEXT: Unknown data dependence.
+; CHECK-NEXT: Dependences:
+; CHECK-NEXT: Unknown:
+; CHECK-NEXT: store i16 0, ptr %gep.iv, align 2 ->
+; CHECK-NEXT: store i32 1, ptr %gep.10.iv, align 4
+; CHECK-EMPTY:
+; CHECK-NEXT: Run-time memory checks:
+; CHECK-NEXT: Grouped accesses:
+; CHECK-EMPTY:
+; CHECK-NEXT: Non vectorizable stores to invariant address were not found in loop.
+; CHECK-NEXT: SCEV assumptions:
+; CHECK-EMPTY:
+; CHECK-NEXT: Expressions re-written:
+;
+entry:
+ %gep.10 = getelementptr nuw i8, ptr %dst, i64 10
+ br label %loop
+
+loop:
+ %iv = phi i64 [ 0, %entry ], [ %iv.next, %loop ]
+ %gep.iv = getelementptr i8, ptr %dst, i64 %iv
+ store i16 0, ptr %gep.iv
+ %gep.10.iv = getelementptr i8, ptr %gep.10, i64 %iv
+ store i32 1, ptr %gep.10.iv
+ %iv.next = add i64 %iv, 8
+ %ec = icmp eq i64 %iv.next, 64
+ br i1 %ec, label %exit, label %loop
+
+exit:
+ ret void
+}
+
+; Source type-size
diff ers from that of the sink, and when
+; determining forward dependence, the source size can
+; prevent forwarding.
+define void @
diff erent_type_sizes_forward(ptr %dst) {
+; CHECK-LABEL: '
diff erent_type_sizes_forward'
+; CHECK-NEXT: loop:
+; CHECK-NEXT: Memory dependences are safe
+; CHECK-NEXT: Dependences:
+; CHECK-NEXT: Forward:
+; CHECK-NEXT: store i32 0, ptr %gep.10.iv, align 4 ->
+; CHECK-NEXT: store i16 1, ptr %gep.iv, align 2
+; CHECK-EMPTY:
+; CHECK-NEXT: Run-time memory checks:
+; CHECK-NEXT: Grouped accesses:
+; CHECK-EMPTY:
+; CHECK-NEXT: Non vectorizable stores to invariant address were not found in loop.
+; CHECK-NEXT: SCEV assumptions:
+; CHECK-EMPTY:
+; CHECK-NEXT: Expressions re-written:
+;
+entry:
+ %gep.10 = getelementptr nuw i8, ptr %dst, i64 10
+ br label %loop
+
+loop:
+ %iv = phi i64 [ 0, %entry ], [ %iv.next, %loop ]
+ %gep.10.iv = getelementptr i8, ptr %gep.10, i64 %iv
+ store i32 0, ptr %gep.10.iv
+ %gep.iv = getelementptr i8, ptr %dst, i64 %iv
+ store i16 1, ptr %gep.iv
+ %iv.next = add i64 %iv, 8
+ %ec = icmp eq i64 %iv.next, 64
+ br i1 %ec, label %exit, label %loop
+
+exit:
+ ret void
+}
+
+; Same as the above, but here, the store size should not prevent
+; ld->st forwarding.
+; TODO: Relax the HasSameSize check; this test should report a
+; forward dependence.
+define void @
diff erent_type_sizes_store_size_cannot_prevent_forwarding(ptr %A, ptr noalias %B) {
+; CHECK-LABEL: '
diff erent_type_sizes_store_size_cannot_prevent_forwarding'
+; CHECK-NEXT: loop:
+; CHECK-NEXT: Report: unsafe dependent memory operations in loop. Use #pragma clang loop distribute(enable) to allow loop distribution to attempt to isolate the offending operations into a separate loop
+; CHECK-NEXT: Forward loop carried data dependence that prevents store-to-load forwarding.
+; CHECK-NEXT: Dependences:
+; CHECK-NEXT: ForwardButPreventsForwarding:
+; CHECK-NEXT: store i32 0, ptr %gep.A, align 4 ->
+; CHECK-NEXT: %l = load i16, ptr %gep.A.1, align 2
+; CHECK-EMPTY:
+; CHECK-NEXT: Run-time memory checks:
+; CHECK-NEXT: Grouped accesses:
+; CHECK-EMPTY:
+; CHECK-NEXT: Non vectorizable stores to invariant address were not found in loop.
+; CHECK-NEXT: SCEV assumptions:
+; CHECK-EMPTY:
+; CHECK-NEXT: Expressions re-written:
+;
+entry:
+ %A.1 = getelementptr i32, ptr %A, i64 1
+ br label %loop
+
+loop:
+ %iv = phi i64 [ 1022, %entry ], [ %iv.next, %loop ]
+ %gep.A = getelementptr inbounds i32, ptr %A, i64 %iv
+ store i32 0, ptr %gep.A
+ %gep.A.1 = getelementptr i32, ptr %A.1, i64 %iv
+ %l = load i16, ptr %gep.A.1
+ store i16 %l, ptr %B
+ %iv.next = add nsw i64 %iv, -1
+ %cmp = icmp eq i64 %iv, 0
+ br i1 %cmp, label %exit, label %loop
+
+exit:
+ ret void
+}
+
+; Same as the above, but here, the load size prevents
+; ld->st forwarding.
+define void @
diff erent_type_sizes_load_size_prevents_forwarding(ptr %A, ptr noalias %B) {
+; CHECK-LABEL: '
diff erent_type_sizes_load_size_prevents_forwarding'
+; CHECK-NEXT: loop:
+; CHECK-NEXT: Report: unsafe dependent memory operations in loop. Use #pragma clang loop distribute(enable) to allow loop distribution to attempt to isolate the offending operations into a separate loop
+; CHECK-NEXT: Forward loop carried data dependence that prevents store-to-load forwarding.
+; CHECK-NEXT: Dependences:
+; CHECK-NEXT: ForwardButPreventsForwarding:
+; CHECK-NEXT: store i16 0, ptr %gep.A, align 2 ->
+; CHECK-NEXT: %l = load i32, ptr %gep.A.1, align 4
+; CHECK-EMPTY:
+; CHECK-NEXT: Run-time memory checks:
+; CHECK-NEXT: Grouped accesses:
+; CHECK-EMPTY:
+; CHECK-NEXT: Non vectorizable stores to invariant address were not found in loop.
+; CHECK-NEXT: SCEV assumptions:
+; CHECK-EMPTY:
+; CHECK-NEXT: Expressions re-written:
+;
+entry:
+ %A.1 = getelementptr i32, ptr %A, i64 1
+ br label %loop
+
+loop:
+ %iv = phi i64 [ 1022, %entry ], [ %iv.next, %loop ]
+ %gep.A = getelementptr inbounds i32, ptr %A, i64 %iv
+ store i16 0, ptr %gep.A
+ %gep.A.1 = getelementptr i32, ptr %A.1, i64 %iv
+ %l = load i32, ptr %gep.A.1
+ store i32 %l, ptr %B
+ %iv.next = add nsw i64 %iv, -1
+ %cmp = icmp eq i64 %iv, 0
+ br i1 %cmp, label %exit, label %loop
+
+exit:
+ ret void
+}
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