; RUN: opt -loop-accesses -analyze < %s | FileCheck %s
-; 3 reads and 3 writes should need 12 memchecks
-
target datalayout = "e-m:e-i64:64-i128:128-n32:64-S128"
target triple = "aarch64--linux-gnueabi"
+; 3 reads and 3 writes should need 12 memchecks
+; CHECK: function 'testf':
; CHECK: Memory dependences are safe with run-time checks
-; Memory dependecies have labels starting from 0, so in
+
+; Memory dependencies have labels starting from 0, so in
; order to verify that we have n checks, we look for
; (n-1): and not n:.
; CHECK: Run-time memory checks:
-; CHECK-NEXT: 0:
-; CHECK: 11:
-; CHECK-NOT: 12:
+; CHECK-NEXT: Check 0:
+; CHECK: Check 11:
+; CHECK-NOT: Check 12:
define void @testf(i16* %a,
i16* %b,
for.end: ; preds = %for.body
ret void
}
+
+; The following (testg and testh) check that we can group
+; memory checks of accesses which differ by a constant value.
+; Both tests are based on the following C code:
+;
+; void testh(short *a, short *b, short *c) {
+; unsigned long ind = 0;
+; for (unsigned long ind = 0; ind < 20; ++ind) {
+; c[2 * ind] = a[ind] * a[ind + 1];
+; c[2 * ind + 1] = a[ind] * a[ind + 1] * b[ind];
+; }
+; }
+;
+; It is sufficient to check the intervals
+; [a, a + 21], [b, b + 20] against [c, c + 41].
+
+; 3 reads and 2 writes - two of the reads can be merged,
+; and the writes can be merged as well. This gives us a
+; total of 2 memory checks.
+
+; CHECK: function 'testg':
+
+; CHECK: Run-time memory checks:
+; CHECK-NEXT: Check 0:
+; CHECK-NEXT: Comparing group 0:
+; CHECK-NEXT: %arrayidxA1 = getelementptr inbounds i16, i16* %a, i64 %add
+; CHECK-NEXT: %arrayidxA = getelementptr inbounds i16, i16* %a, i64 %ind
+; CHECK-NEXT: Against group 2:
+; CHECK-NEXT: %arrayidxC1 = getelementptr inbounds i16, i16* %c, i64 %store_ind_inc
+; CHECK-NEXT: %arrayidxC = getelementptr inbounds i16, i16* %c, i64 %store_ind
+; CHECK-NEXT: Check 1:
+; CHECK-NEXT: Comparing group 1:
+; CHECK-NEXT: %arrayidxB = getelementptr inbounds i16, i16* %b, i64 %ind
+; CHECK-NEXT: Against group 2:
+; CHECK-NEXT: %arrayidxC1 = getelementptr inbounds i16, i16* %c, i64 %store_ind_inc
+; CHECK-NEXT: %arrayidxC = getelementptr inbounds i16, i16* %c, i64 %store_ind
+; CHECK-NEXT: Grouped accesses:
+; CHECK-NEXT: Group 0:
+; CHECK-NEXT: (Low: %a High: (40 + %a))
+; CHECK-NEXT: Member: {(2 + %a),+,2}
+; CHECK-NEXT: Member: {%a,+,2}
+; CHECK-NEXT: Group 1:
+; CHECK-NEXT: (Low: %b High: (38 + %b))
+; CHECK-NEXT: Member: {%b,+,2}
+; CHECK-NEXT: Group 2:
+; CHECK-NEXT: (Low: %c High: (78 + %c))
+; CHECK-NEXT: Member: {(2 + %c),+,4}
+; CHECK-NEXT: Member: {%c,+,4}
+
+define void @testg(i16* %a,
+ i16* %b,
+ i16* %c) {
+entry:
+ br label %for.body
+
+for.body: ; preds = %for.body, %entry
+ %ind = phi i64 [ 0, %entry ], [ %add, %for.body ]
+ %store_ind = phi i64 [ 0, %entry ], [ %store_ind_next, %for.body ]
+
+ %add = add nuw nsw i64 %ind, 1
+ %store_ind_inc = add nuw nsw i64 %store_ind, 1
+ %store_ind_next = add nuw nsw i64 %store_ind_inc, 1
+
+ %arrayidxA = getelementptr inbounds i16, i16* %a, i64 %ind
+ %loadA = load i16, i16* %arrayidxA, align 2
+
+ %arrayidxA1 = getelementptr inbounds i16, i16* %a, i64 %add
+ %loadA1 = load i16, i16* %arrayidxA1, align 2
+
+ %arrayidxB = getelementptr inbounds i16, i16* %b, i64 %ind
+ %loadB = load i16, i16* %arrayidxB, align 2
+
+ %mul = mul i16 %loadA, %loadA1
+ %mul1 = mul i16 %mul, %loadB
+
+ %arrayidxC = getelementptr inbounds i16, i16* %c, i64 %store_ind
+ store i16 %mul1, i16* %arrayidxC, align 2
+
+ %arrayidxC1 = getelementptr inbounds i16, i16* %c, i64 %store_ind_inc
+ store i16 %mul, i16* %arrayidxC1, align 2
+
+ %exitcond = icmp eq i64 %add, 20
+ br i1 %exitcond, label %for.end, label %for.body
+
+for.end: ; preds = %for.body
+ ret void
+}
+
+; 3 reads and 2 writes - the writes can be merged into a single
+; group, but the GEPs used for the reads are not marked as inbounds.
+; We can still merge them because we are using a unit stride for
+; accesses, so we cannot overflow the GEPs.
+
+; CHECK: function 'testh':
+; CHECK: Run-time memory checks:
+; CHECK-NEXT: Check 0:
+; CHECK-NEXT: Comparing group 0:
+; CHECK-NEXT: %arrayidxA1 = getelementptr i16, i16* %a, i64 %add
+; CHECK-NEXT: %arrayidxA = getelementptr i16, i16* %a, i64 %ind
+; CHECK-NEXT: Against group 2:
+; CHECK-NEXT: %arrayidxC1 = getelementptr inbounds i16, i16* %c, i64 %store_ind_inc
+; CHECK-NEXT: %arrayidxC = getelementptr inbounds i16, i16* %c, i64 %store_ind
+; CHECK-NEXT: Check 1:
+; CHECK-NEXT: Comparing group 1:
+; CHECK-NEXT: %arrayidxB = getelementptr i16, i16* %b, i64 %ind
+; CHECK-NEXT: Against group 2:
+; CHECK-NEXT: %arrayidxC1 = getelementptr inbounds i16, i16* %c, i64 %store_ind_inc
+; CHECK-NEXT: %arrayidxC = getelementptr inbounds i16, i16* %c, i64 %store_ind
+; CHECK-NEXT: Grouped accesses:
+; CHECK-NEXT: Group 0:
+; CHECK-NEXT: (Low: %a High: (40 + %a))
+; CHECK-NEXT: Member: {(2 + %a),+,2}
+; CHECK-NEXT: Member: {%a,+,2}
+; CHECK-NEXT: Group 1:
+; CHECK-NEXT: (Low: %b High: (38 + %b))
+; CHECK-NEXT: Member: {%b,+,2}
+; CHECK-NEXT: Group 2:
+; CHECK-NEXT: (Low: %c High: (78 + %c))
+; CHECK-NEXT: Member: {(2 + %c),+,4}
+; CHECK-NEXT: Member: {%c,+,4}
+
+define void @testh(i16* %a,
+ i16* %b,
+ i16* %c) {
+entry:
+ br label %for.body
+
+for.body: ; preds = %for.body, %entry
+ %ind = phi i64 [ 0, %entry ], [ %add, %for.body ]
+ %store_ind = phi i64 [ 0, %entry ], [ %store_ind_next, %for.body ]
+
+ %add = add nuw nsw i64 %ind, 1
+ %store_ind_inc = add nuw nsw i64 %store_ind, 1
+ %store_ind_next = add nuw nsw i64 %store_ind_inc, 1
+
+ %arrayidxA = getelementptr i16, i16* %a, i64 %ind
+ %loadA = load i16, i16* %arrayidxA, align 2
+
+ %arrayidxA1 = getelementptr i16, i16* %a, i64 %add
+ %loadA1 = load i16, i16* %arrayidxA1, align 2
+
+ %arrayidxB = getelementptr i16, i16* %b, i64 %ind
+ %loadB = load i16, i16* %arrayidxB, align 2
+
+ %mul = mul i16 %loadA, %loadA1
+ %mul1 = mul i16 %mul, %loadB
+
+ %arrayidxC = getelementptr inbounds i16, i16* %c, i64 %store_ind
+ store i16 %mul1, i16* %arrayidxC, align 2
+
+ %arrayidxC1 = getelementptr inbounds i16, i16* %c, i64 %store_ind_inc
+ store i16 %mul, i16* %arrayidxC1, align 2
+
+ %exitcond = icmp eq i64 %add, 20
+ br i1 %exitcond, label %for.end, label %for.body
+
+for.end: ; preds = %for.body
+ ret void
+}
projects / oota-llvm.git / blobdiff