overwritten.ll
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; RUN: opt %loadPolly -polly-stmt-granularity=bb -polly-simplify -analyze < %s | FileCheck -match-full-lines %s
;
; Remove a store that is overwritten by another store in the same statement.
;
; for (int j = 0; j < n; j += 1) {
; A[0] = 21.0;
; A[0] = 42.0;
; }
;
define void @overwritten(i32 %n, double* noalias nonnull %A) {
entry:
br label %for
for:
%j = phi i32 [0, %entry], [%j.inc, %inc]
%j.cmp = icmp slt i32 %j, %n
br i1 %j.cmp, label %body, label %exit
body:
store double 21.0, double* %A
store double 42.0, double* %A
br label %inc
inc:
%j.inc = add nuw nsw i32 %j, 1
br label %for
exit:
br label %return
return:
ret void
}
; CHECK: Statistics {
; CHECK: Overwrites removed: 1
; CHECK: }
; CHECK: After accesses {
; CHECK-NEXT: Stmt_body
; CHECK-NEXT: MustWriteAccess := [Reduction Type: NONE] [Scalar: 0]
; CHECK-NEXT: [n] -> { Stmt_body[i0] -> MemRef_A[0] };
; CHECK-NEXT: }