[LAA] Tests with different strides where BTC can rule out dependence.

Tests to add support for different strides with isSafeDependenceDistance as follow-up to #88039.
llvm · Apr 25, 2024 · d5f2753 · d5f2753
1 parent 87ec4ab
commit d5f2753
Showing 1 changed file with 156 additions and 0 deletions.
diff --git a/...est/Analysis/LoopAccessAnalysis/different-strides-safe-dep-due-to-backedge-taken-count.ll b/...est/Analysis/LoopAccessAnalysis/different-strides-safe-dep-due-to-backedge-taken-count.ll
@@ -0,0 +1,156 @@
+; NOTE: Assertions have been autogenerated by utils/update_analyze_test_checks.py UTC_ARGS: --version 4
+; RUN: opt -passes='print<access-info>' -disable-output %s 2>&1 | FileCheck %s
+
+target datalayout = "e-m:o-i64:64-i128:128-n32:64-S128"
+
+define void @forward_dep_known_safe_due_to_backedge_taken_count(ptr %A) {
+; CHECK-LABEL: 'forward_dep_known_safe_due_to_backedge_taken_count'
+; 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:            %l = load i32, ptr %gep.mul.2, align 4 ->
+; CHECK-NEXT:            store i32 %add, ptr %gep, 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.511= getelementptr inbounds i32, ptr %A, i64 511
+  br label %loop
+
+loop:
+  %iv = phi i64 [ 0, %entry ], [ %iv.next, %loop ]
+  %iv.mul.2 = shl nuw nsw i64 %iv, 1
+  %gep.mul.2 = getelementptr inbounds i32, ptr %A.511, i64 %iv.mul.2
+  %l = load i32, ptr %gep.mul.2, align 4
+  %add = add nsw i32 %l, 5
+  %gep = getelementptr inbounds i32, ptr %A, i64 %iv
+  store i32 %add, ptr %gep, align 4
+  %iv.next = add nuw nsw i64 %iv, 1
+  %exitcond.not = icmp eq i64 %iv.next, 256
+  br i1 %exitcond.not, label %exit, label %loop
+
+exit:
+  ret void
+}
+
+define void @forward_dep_not_known_safe_due_to_backedge_taken_count(ptr %A) {
+; CHECK-LABEL: 'forward_dep_not_known_safe_due_to_backedge_taken_count'
+; 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:            %l = load i32, ptr %gep.mul.2, align 4 ->
+; CHECK-NEXT:            store i32 %add, ptr %gep, 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.510 = getelementptr inbounds i32, ptr %A, i64 510
+  br label %loop
+
+loop:
+  %iv = phi i64 [ 0, %entry ], [ %iv.next, %loop ]
+  %iv.mul.2 = shl nuw nsw i64 %iv, 1
+  %gep.mul.2 = getelementptr inbounds i32, ptr %A.510, i64 %iv.mul.2
+  %l = load i32, ptr %gep.mul.2, align 4
+  %add = add nsw i32 %l, 5
+  %gep = getelementptr inbounds i32, ptr %A, i64 %iv
+  store i32 %add, ptr %gep, align 4
+  %iv.next = add nuw nsw i64 %iv, 1
+  %exitcond.not = icmp eq i64 %iv.next, 256
+  br i1 %exitcond.not, label %exit, label %loop
+
+exit:
+  ret void
+}
+
+define void @unknown_dep_known_safe_due_to_backedge_taken_count(ptr %A) {
+; CHECK-LABEL: 'unknown_dep_known_safe_due_to_backedge_taken_count'
+; 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:            %l = load i32, ptr %gep, align 4 ->
+; CHECK-NEXT:            store i32 %add, ptr %gep.mul.2, 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.511 = getelementptr inbounds i32, ptr %A, i64 511
+  br label %loop
+
+loop:
+  %iv = phi i64 [ 0, %entry ], [ %iv.next, %loop ]
+  %iv.mul.2 = shl nuw nsw i64 %iv, 1
+  %gep = getelementptr inbounds i32, ptr %A, i64 %iv
+  %l = load i32, ptr %gep, align 4
+  %add = add nsw i32 %l, 5
+  %gep.mul.2 = getelementptr inbounds i32, ptr %A.511, i64 %iv.mul.2
+  store i32 %add, ptr %gep.mul.2, align 4
+  %iv.next = add nuw nsw i64 %iv, 1
+  %exitcond.not = icmp eq i64 %iv.next, 256
+  br i1 %exitcond.not, label %exit, label %loop
+
+exit:
+  ret void
+}
+
+define void @unknown_dep_not_known_safe_due_to_backedge_taken_count(ptr %A) {
+; CHECK-LABEL: 'unknown_dep_not_known_safe_due_to_backedge_taken_count'
+; 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:            %l = load i32, ptr %gep, align 4 ->
+; CHECK-NEXT:            store i32 %add, ptr %gep.mul.2, 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.510 = getelementptr inbounds i32, ptr %A, i64 510
+  br label %loop
+
+loop:
+  %iv = phi i64 [ 0, %entry ], [ %iv.next, %loop ]
+  %iv.mul.2 = shl nuw nsw i64 %iv, 1
+  %gep = getelementptr inbounds i32, ptr %A, i64 %iv
+  %l = load i32, ptr %gep, align 4
+  %add = add nsw i32 %l, 5
+  %gep.mul.2 = getelementptr inbounds i32, ptr %A.510, i64 %iv.mul.2
+  store i32 %add, ptr %gep.mul.2, align 4
+  %iv.next = add nuw nsw i64 %iv, 1
+  %exitcond.not = icmp eq i64 %iv.next, 256
+  br i1 %exitcond.not, label %exit, label %loop
+
+exit:
+  ret void
+}