blob: 40de1c2d0656e128b06ce32dae5f64c8feb5b1c4 [file] [log] [blame]
; RUN: opt %loadPolly -polly-dependences -analyze < %s | FileCheck %s
;
; Verify that the presence of a may-write (S1) between a read (S0) and a
; must-write (S2) does not block the generation of RAW dependences. This makes
; sure that we capture as many RAW dependences as possible.
;
; For this example, we want both (S0(Read) -> S1 (May-Write)) as well as
; (S0(Read) -> S2(Must-Write)).
;
; CHECK: WAR dependences:
; CHECK-NEXT: { Stmt_S0[i0] -> Stmt_if_end__TO__S2[i0] : 0 < i0 <= 2; Stmt_S0[i0] -> Stmt_S2[i0] : 0 < i0 <= 2 }
;
;
; static const int N = 3000;
;
; void f(int *sum, int *A, int *B, int *out) {
; for (int i = 0; i <= 2; i++) {
; if (i) {
; S0: *out += *sum;
; }
;
; if (i * i) {
; S1: *sum = *A;
; }
; S2: *sum = *B;
; }
; }
;
target datalayout = "e-m:o-i64:64-f80:128-n8:16:32:64-S128"
define void @f(i32* %sum, i32* %A, i32* %B, i32* %out) {
entry:
br label %for.cond
for.cond: ; preds = %for.inc, %entry
%i.0 = phi i32 [ 0, %entry ], [ %inc, %for.inc ]
%exitcond = icmp ne i32 %i.0, 3
br i1 %exitcond, label %for.body, label %for.end
for.body: ; preds = %for.cond
%tobool = icmp eq i32 %i.0, 0
br i1 %tobool, label %if.end, label %S0
S0: ; preds = %for.body
%tmp = load i32, i32* %sum, align 4
%tmp1 = load i32, i32* %out, align 4
%add = add nsw i32 %tmp1, %tmp
store i32 %add, i32* %out, align 4
br label %if.end
if.end: ; preds = %for.body, %S0
%mul = mul nsw i32 %i.0, %i.0
%tobool1 = icmp eq i32 %mul, 0
br i1 %tobool1, label %S2, label %S1
S1: ; preds = %if.end
%tmp2 = load i32, i32* %A, align 4
store i32 %tmp2, i32* %sum, align 4
br label %S2
S2: ; preds = %if.end, %S1
%tmp3 = load i32, i32* %B, align 4
store i32 %tmp3, i32* %sum, align 4
br label %for.inc
for.inc: ; preds = %S2
%inc = add nuw nsw i32 %i.0, 1
br label %for.cond
for.end: ; preds = %for.cond
ret void
}