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288 lines
10 KiB
LLVM
288 lines
10 KiB
LLVM
; RUN: opt -loop-accesses -analyze < %s | FileCheck %s
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target datalayout = "e-m:e-i64:64-i128:128-n32:64-S128"
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target triple = "aarch64--linux-gnueabi"
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; 3 reads and 3 writes should need 12 memchecks
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; CHECK: function 'testf':
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; CHECK: Memory dependences are safe with run-time checks
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; Memory dependencies have labels starting from 0, so in
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; order to verify that we have n checks, we look for
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; (n-1): and not n:.
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; CHECK: Run-time memory checks:
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; CHECK-NEXT: Check 0:
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; CHECK: Check 11:
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; CHECK-NOT: Check 12:
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define void @testf(i16* %a,
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i16* %b,
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i16* %c,
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i16* %d,
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i16* %e,
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i16* %f) {
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entry:
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br label %for.body
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for.body: ; preds = %for.body, %entry
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%ind = phi i64 [ 0, %entry ], [ %add, %for.body ]
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%add = add nuw nsw i64 %ind, 1
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%arrayidxA = getelementptr inbounds i16, i16* %a, i64 %ind
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%loadA = load i16, i16* %arrayidxA, align 2
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%arrayidxB = getelementptr inbounds i16, i16* %b, i64 %ind
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%loadB = load i16, i16* %arrayidxB, align 2
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%arrayidxC = getelementptr inbounds i16, i16* %c, i64 %ind
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%loadC = load i16, i16* %arrayidxC, align 2
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%mul = mul i16 %loadB, %loadA
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%mul1 = mul i16 %mul, %loadC
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%arrayidxD = getelementptr inbounds i16, i16* %d, i64 %ind
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store i16 %mul1, i16* %arrayidxD, align 2
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%arrayidxE = getelementptr inbounds i16, i16* %e, i64 %ind
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store i16 %mul, i16* %arrayidxE, align 2
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%arrayidxF = getelementptr inbounds i16, i16* %f, i64 %ind
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store i16 %mul1, i16* %arrayidxF, align 2
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%exitcond = icmp eq i64 %add, 20
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br i1 %exitcond, label %for.end, label %for.body
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for.end: ; preds = %for.body
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ret void
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}
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; The following (testg and testh) check that we can group
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; memory checks of accesses which differ by a constant value.
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; Both tests are based on the following C code:
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;
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; void testh(short *a, short *b, short *c) {
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; unsigned long ind = 0;
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; for (unsigned long ind = 0; ind < 20; ++ind) {
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; c[2 * ind] = a[ind] * a[ind + 1];
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; c[2 * ind + 1] = a[ind] * a[ind + 1] * b[ind];
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; }
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; }
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;
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; It is sufficient to check the intervals
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; [a, a + 21], [b, b + 20] against [c, c + 41].
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; 3 reads and 2 writes - two of the reads can be merged,
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; and the writes can be merged as well. This gives us a
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; total of 2 memory checks.
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; CHECK: function 'testg':
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; CHECK: Run-time memory checks:
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; CHECK-NEXT: Check 0:
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; CHECK-NEXT: Comparing group ([[ZERO:.+]]):
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; CHECK-NEXT: %arrayidxC1 = getelementptr inbounds i16, i16* %c, i64 %store_ind_inc
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; CHECK-NEXT: %arrayidxC = getelementptr inbounds i16, i16* %c, i64 %store_ind
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; CHECK-NEXT: Against group ([[ONE:.+]]):
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; CHECK-NEXT: %arrayidxA1 = getelementptr inbounds i16, i16* %a, i64 %add
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; CHECK-NEXT: %arrayidxA = getelementptr inbounds i16, i16* %a, i64 %ind
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; CHECK-NEXT: Check 1:
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; CHECK-NEXT: Comparing group ({{.*}}[[ZERO]]):
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; CHECK-NEXT: %arrayidxC1 = getelementptr inbounds i16, i16* %c, i64 %store_ind_inc
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; CHECK-NEXT: %arrayidxC = getelementptr inbounds i16, i16* %c, i64 %store_ind
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; CHECK-NEXT: Against group ([[TWO:.+]]):
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; CHECK-NEXT: %arrayidxB = getelementptr inbounds i16, i16* %b, i64 %ind
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; CHECK-NEXT: Grouped accesses:
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; CHECK-NEXT: Group {{.*}}[[ZERO]]:
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; CHECK-NEXT: (Low: %c High: (78 + %c))
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; CHECK-NEXT: Member: {(2 + %c),+,4}
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; CHECK-NEXT: Member: {%c,+,4}
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; CHECK-NEXT: Group {{.*}}[[ONE]]:
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; CHECK-NEXT: (Low: %a High: (40 + %a))
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; CHECK-NEXT: Member: {(2 + %a),+,2}
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; CHECK-NEXT: Member: {%a,+,2}
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; CHECK-NEXT: Group {{.*}}[[TWO]]:
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; CHECK-NEXT: (Low: %b High: (38 + %b))
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; CHECK-NEXT: Member: {%b,+,2}
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define void @testg(i16* %a,
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i16* %b,
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i16* %c) {
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entry:
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br label %for.body
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for.body: ; preds = %for.body, %entry
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%ind = phi i64 [ 0, %entry ], [ %add, %for.body ]
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%store_ind = phi i64 [ 0, %entry ], [ %store_ind_next, %for.body ]
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%add = add nuw nsw i64 %ind, 1
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%store_ind_inc = add nuw nsw i64 %store_ind, 1
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%store_ind_next = add nuw nsw i64 %store_ind_inc, 1
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%arrayidxA = getelementptr inbounds i16, i16* %a, i64 %ind
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%loadA = load i16, i16* %arrayidxA, align 2
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%arrayidxA1 = getelementptr inbounds i16, i16* %a, i64 %add
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%loadA1 = load i16, i16* %arrayidxA1, align 2
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%arrayidxB = getelementptr inbounds i16, i16* %b, i64 %ind
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%loadB = load i16, i16* %arrayidxB, align 2
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%mul = mul i16 %loadA, %loadA1
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%mul1 = mul i16 %mul, %loadB
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%arrayidxC = getelementptr inbounds i16, i16* %c, i64 %store_ind
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store i16 %mul1, i16* %arrayidxC, align 2
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%arrayidxC1 = getelementptr inbounds i16, i16* %c, i64 %store_ind_inc
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store i16 %mul, i16* %arrayidxC1, align 2
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%exitcond = icmp eq i64 %add, 20
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br i1 %exitcond, label %for.end, label %for.body
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for.end: ; preds = %for.body
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ret void
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}
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; 3 reads and 2 writes - the writes can be merged into a single
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; group, but the GEPs used for the reads are not marked as inbounds.
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; We can still merge them because we are using a unit stride for
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; accesses, so we cannot overflow the GEPs.
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; CHECK: function 'testh':
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; CHECK: Run-time memory checks:
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; CHECK-NEXT: Check 0:
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; CHECK-NEXT: Comparing group ([[ZERO:.+]]):
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; CHECK-NEXT: %arrayidxC1 = getelementptr inbounds i16, i16* %c, i64 %store_ind_inc
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; CHECK-NEXT: %arrayidxC = getelementptr inbounds i16, i16* %c, i64 %store_ind
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; CHECK-NEXT: Against group ([[ONE:.+]]):
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; CHECK-NEXT: %arrayidxA1 = getelementptr i16, i16* %a, i64 %add
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; CHECK-NEXT: %arrayidxA = getelementptr i16, i16* %a, i64 %ind
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; CHECK-NEXT: Check 1:
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; CHECK-NEXT: Comparing group ({{.*}}[[ZERO]]):
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; CHECK-NEXT: %arrayidxC1 = getelementptr inbounds i16, i16* %c, i64 %store_ind_inc
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; CHECK-NEXT: %arrayidxC = getelementptr inbounds i16, i16* %c, i64 %store_ind
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; CHECK-NEXT: Against group ([[TWO:.+]]):
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; CHECK-NEXT: %arrayidxB = getelementptr i16, i16* %b, i64 %ind
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; CHECK-NEXT: Grouped accesses:
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; CHECK-NEXT: Group {{.*}}[[ZERO]]:
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; CHECK-NEXT: (Low: %c High: (78 + %c))
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; CHECK-NEXT: Member: {(2 + %c),+,4}
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; CHECK-NEXT: Member: {%c,+,4}
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; CHECK-NEXT: Group {{.*}}[[ONE]]:
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; CHECK-NEXT: (Low: %a High: (40 + %a))
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; CHECK-NEXT: Member: {(2 + %a),+,2}
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; CHECK-NEXT: Member: {%a,+,2}
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; CHECK-NEXT: Group {{.*}}[[TWO]]:
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; CHECK-NEXT: (Low: %b High: (38 + %b))
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; CHECK-NEXT: Member: {%b,+,2}
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define void @testh(i16* %a,
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i16* %b,
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i16* %c) {
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entry:
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br label %for.body
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for.body: ; preds = %for.body, %entry
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%ind = phi i64 [ 0, %entry ], [ %add, %for.body ]
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%store_ind = phi i64 [ 0, %entry ], [ %store_ind_next, %for.body ]
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%add = add nuw nsw i64 %ind, 1
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%store_ind_inc = add nuw nsw i64 %store_ind, 1
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%store_ind_next = add nuw nsw i64 %store_ind_inc, 1
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%arrayidxA = getelementptr i16, i16* %a, i64 %ind
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%loadA = load i16, i16* %arrayidxA, align 2
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%arrayidxA1 = getelementptr i16, i16* %a, i64 %add
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%loadA1 = load i16, i16* %arrayidxA1, align 2
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%arrayidxB = getelementptr i16, i16* %b, i64 %ind
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%loadB = load i16, i16* %arrayidxB, align 2
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%mul = mul i16 %loadA, %loadA1
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%mul1 = mul i16 %mul, %loadB
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%arrayidxC = getelementptr inbounds i16, i16* %c, i64 %store_ind
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store i16 %mul1, i16* %arrayidxC, align 2
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%arrayidxC1 = getelementptr inbounds i16, i16* %c, i64 %store_ind_inc
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store i16 %mul, i16* %arrayidxC1, align 2
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%exitcond = icmp eq i64 %add, 20
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br i1 %exitcond, label %for.end, label %for.body
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for.end: ; preds = %for.body
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ret void
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}
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; Don't merge pointers if we need to perform a check against a pointer
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; to the same underlying object (doing so would emit a check that could be
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; falsely invalidated) For example, in the following loop:
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;
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; for (i = 0; i < 5000; ++i)
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; a[i + offset] = a[i] + a[i + 10000]
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;
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; we should not merge the intervals associated with the reads (0,5000) and
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; (10000, 15000) into (0, 15000) as this will pottentially fail the check
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; against the interval associated with the write.
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;
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; We cannot have this check unless ShouldRetryWithRuntimeCheck is set,
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; and therefore the grouping algorithm would create a separate group for
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; each pointer.
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; CHECK: function 'testi':
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; CHECK: Run-time memory checks:
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; CHECK-NEXT: Check 0:
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; CHECK-NEXT: Comparing group ([[ZERO:.+]]):
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; CHECK-NEXT: %storeidx = getelementptr inbounds i16, i16* %a, i64 %store_ind
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; CHECK-NEXT: Against group ([[ONE:.+]]):
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; CHECK-NEXT: %arrayidxA1 = getelementptr i16, i16* %a, i64 %ind
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; CHECK-NEXT: Check 1:
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; CHECK-NEXT: Comparing group ({{.*}}[[ZERO]]):
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; CHECK-NEXT: %storeidx = getelementptr inbounds i16, i16* %a, i64 %store_ind
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; CHECK-NEXT: Against group ([[TWO:.+]]):
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; CHECK-NEXT: %arrayidxA2 = getelementptr i16, i16* %a, i64 %ind2
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; CHECK-NEXT: Grouped accesses:
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; CHECK-NEXT: Group {{.*}}[[ZERO]]:
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; CHECK-NEXT: (Low: ((2 * %offset) + %a) High: (9998 + (2 * %offset) + %a))
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; CHECK-NEXT: Member: {((2 * %offset) + %a),+,2}<nsw><%for.body>
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; CHECK-NEXT: Group {{.*}}[[ONE]]:
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; CHECK-NEXT: (Low: %a High: (9998 + %a))
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; CHECK-NEXT: Member: {%a,+,2}<%for.body>
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; CHECK-NEXT: Group {{.*}}[[TWO]]:
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; CHECK-NEXT: (Low: (20000 + %a) High: (29998 + %a))
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; CHECK-NEXT: Member: {(20000 + %a),+,2}<%for.body>
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define void @testi(i16* %a,
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i64 %offset) {
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entry:
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br label %for.body
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for.body: ; preds = %for.body, %entry
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%ind = phi i64 [ 0, %entry ], [ %add, %for.body ]
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%store_ind = phi i64 [ %offset, %entry ], [ %store_ind_inc, %for.body ]
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%add = add nuw nsw i64 %ind, 1
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%store_ind_inc = add nuw nsw i64 %store_ind, 1
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%arrayidxA1 = getelementptr i16, i16* %a, i64 %ind
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%ind2 = add nuw nsw i64 %ind, 10000
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%arrayidxA2 = getelementptr i16, i16* %a, i64 %ind2
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%loadA1 = load i16, i16* %arrayidxA1, align 2
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%loadA2 = load i16, i16* %arrayidxA2, align 2
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%addres = add i16 %loadA1, %loadA2
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%storeidx = getelementptr inbounds i16, i16* %a, i64 %store_ind
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store i16 %addres, i16* %storeidx, align 2
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%exitcond = icmp eq i64 %add, 5000
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br i1 %exitcond, label %for.end, label %for.body
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for.end: ; preds = %for.body
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ret void
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}
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