parallel-loop-md-merge.ll
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; RUN: opt -always-inline -globalopt -S < %s | FileCheck %s
;
; static void __attribute__((always_inline)) callee(long n, double A[static const restrict n], long i) {
; for (long j = 0; j < n; j += 1)
; A[i * n + j] = 42;
; }
;
; void caller(long n, double A[static const restrict n]) {
; for (long i = 0; i < n; i += 1)
; callee(n, A, i);
; }
;
; Check that the access groups (llvm.access.group) are correctly merged.
;
target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
define internal void @callee(i64 %n, double* noalias nonnull %A, i64 %i) #0 {
entry:
br label %for.cond
for.cond:
%j.0 = phi i64 [ 0, %entry ], [ %add1, %for.body ]
%cmp = icmp slt i64 %j.0, %n
br i1 %cmp, label %for.body, label %for.end
for.body:
%mul = mul nsw i64 %i, %n
%add = add nsw i64 %mul, %j.0
%arrayidx = getelementptr inbounds double, double* %A, i64 %add
store double 4.200000e+01, double* %arrayidx, align 8, !llvm.access.group !6
%add1 = add nuw nsw i64 %j.0, 1
br label %for.cond, !llvm.loop !7
for.end:
ret void
}
attributes #0 = { alwaysinline }
!6 = distinct !{} ; access group
!7 = distinct !{!7, !9} ; LoopID
!9 = !{!"llvm.loop.parallel_accesses", !6}
define void @caller(i64 %n, double* noalias nonnull %A) {
entry:
br label %for.cond
for.cond:
%i.0 = phi i64 [ 0, %entry ], [ %add, %for.body ]
%cmp = icmp slt i64 %i.0, %n
br i1 %cmp, label %for.body, label %for.end
for.body:
call void @callee(i64 %n, double* %A, i64 %i.0), !llvm.access.group !10
%add = add nuw nsw i64 %i.0, 1
br label %for.cond, !llvm.loop !11
for.end:
ret void
}
!10 = distinct !{} ; access group
!11 = distinct !{!11, !12} ; LoopID
!12 = !{!"llvm.loop.parallel_accesses", !10}
; CHECK: store double 4.200000e+01, {{.*}} !llvm.access.group ![[ACCESS_GROUP_LIST_3:[0-9]+]]
; CHECK: br label %for.cond.i, !llvm.loop ![[LOOP_INNER:[0-9]+]]
; CHECK: br label %for.cond, !llvm.loop ![[LOOP_OUTER:[0-9]+]]
; CHECK: ![[ACCESS_GROUP_LIST_3]] = !{![[ACCESS_GROUP_INNER:[0-9]+]], ![[ACCESS_GROUP_OUTER:[0-9]+]]}
; CHECK: ![[ACCESS_GROUP_INNER]] = distinct !{}
; CHECK: ![[ACCESS_GROUP_OUTER]] = distinct !{}
; CHECK: ![[LOOP_INNER]] = distinct !{![[LOOP_INNER]], ![[ACCESSES_INNER:[0-9]+]]}
; CHECK: ![[ACCESSES_INNER]] = !{!"llvm.loop.parallel_accesses", ![[ACCESS_GROUP_INNER]]}
; CHECK: ![[LOOP_OUTER]] = distinct !{![[LOOP_OUTER]], ![[ACCESSES_OUTER:[0-9]+]]}
; CHECK: ![[ACCESSES_OUTER]] = !{!"llvm.loop.parallel_accesses", ![[ACCESS_GROUP_OUTER]]}