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; NOTE: Assertions have been autogenerated by utils/update_analyze_test_checks.py UTC_ARGS: --version 6
; RUN: opt < %s -disable-output "-passes=print<da>" 2>&1 \
; RUN: | FileCheck %s --check-prefixes=CHECK,CHECK-ALL
; RUN: opt < %s -disable-output "-passes=print<da>" -da-enable-dependence-test=strong-siv 2>&1 \
; RUN: | FileCheck %s --check-prefixes=CHECK,CHECK-STRONG-SIV
; for (i = 0; i < (1LL << 62); i++) {
; if (0 <= 2*i - 2)
; A[2*i - 2] = 1;
;
; if (0 <= 2*i - 4)
; A[2*i - 4] = 2;
; }
;
; FIXME: DependenceAnalysis currently detects no dependency between the two
; stores, but it does exist. For example, each store will access A[0] when i
; is 1 and 2 respectively.
; The root cause is that the product of the BTC and the coefficient
; ((1LL << 62) - 1 and 2) overflows in a signed sense.
define void @strongsiv_const_ovfl(ptr %A) {
; CHECK-LABEL: 'strongsiv_const_ovfl'
; CHECK-NEXT: Src: store i8 1, ptr %gep.0, align 1 --> Dst: store i8 1, ptr %gep.0, align 1
; CHECK-NEXT: da analyze - none!
; CHECK-NEXT: Src: store i8 1, ptr %gep.0, align 1 --> Dst: store i8 2, ptr %gep.1, align 1
; CHECK-NEXT: da analyze - none!
; CHECK-NEXT: Src: store i8 2, ptr %gep.1, align 1 --> Dst: store i8 2, ptr %gep.1, align 1
; CHECK-NEXT: da analyze - none!
;
entry:
br label %loop.header
loop.header:
%i = phi i64 [ 0, %entry ], [ %i.inc, %loop.latch ]
%offset.0 = phi i64 [ -2, %entry ], [ %offset.0.next, %loop.latch ]
%offset.1 = phi i64 [ -4, %entry ], [ %offset.1.next, %loop.latch ]
%ec = icmp eq i64 %i, 4611686018427387904
br i1 %ec, label %exit, label %loop.body
loop.body:
%cond.0 = icmp sge i64 %offset.0, 0
%cond.1 = icmp sge i64 %offset.1, 0
br i1 %cond.0, label %if.then.0, label %loop.middle
if.then.0:
%gep.0 = getelementptr inbounds i8, ptr %A, i64 %offset.0
store i8 1, ptr %gep.0
br label %loop.middle
loop.middle:
br i1 %cond.1, label %if.then.1, label %loop.latch
if.then.1:
%gep.1 = getelementptr inbounds i8, ptr %A, i64 %offset.1
store i8 2, ptr %gep.1
br label %loop.latch
loop.latch:
%i.inc = add nuw nsw i64 %i, 1
%offset.0.next = add nsw i64 %offset.0, 2
%offset.1.next = add nsw i64 %offset.1, 2
br label %loop.header
exit:
ret void
}
;; NOTE: These prefixes are unused and the list is autogenerated. Do not add tests below this line:
; CHECK-ALL: {{.*}}
; CHECK-STRONG-SIV: {{.*}}
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