non-pure-function-calls-causes-dead-blocks.ll
4.55 KB
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; RUN: opt %loadPolly -polly-scops -analyze < %s | FileCheck %s
;
; Error blocks are skipped during SCoP detection. We skip them during
; SCoP formation too as they might contain instructions we can not handle.
; However statements / basic blocks that follow error blocks are modeled.
;
; void timer_start(void);
; void timer_stop(void);
; void kernel(int *A, int *B, int timeit, int N) {
;
; if (timeit) {
; timer_start();
; // split BB
; A[0] = 0; // Do not create a statement for this block
; }
;
; for (int i = 0; i < N; i++)
; A[i] += B[i];
;
; if (timeit) {
; timer_stop();
; if (invalid float branch) // Do not crash on the float branch
; timer_start();
; }
;
; for (int i = 0; i < N; i++)
; A[i] += B[i];
;
; if (timeit)
; timer_stop();
; }
;
; The assumed context should not be empty even though all statements are
; executed only if timeit != 0.
;
; CHECK: Region: %entry.split---%if.end.20
; CHECK: Assumed Context:
; CHECK-NEXT: [timeit, N] -> { : }
; CHECK: Invalid Context:
; CHECK-NEXT: [timeit, N] -> { : timeit < 0 or timeit > 0 }
; CHECK: Statements {
; CHECK-NOT: Stmt_if_then_split
; CHECK: Stmt_for_body
; CHECK: Stmt_for_body_9
; CHECK: }
;
target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
define void @kernel(i32* %A, i32* %B, i32 %timeit, i32 %N) {
entry:
br label %entry.split
entry.split:
%tobool = icmp eq i32 %timeit, 0
br i1 %tobool, label %for.cond.pre, label %if.then
if.then: ; preds = %entry
call void @timer_start()
br label %if.then.split
; Dead block if we assume if.then not to be executed because of the call
if.then.split: ; preds = %if.then
%A0 = getelementptr inbounds i32, i32* %A, i64 0
store i32 0, i32* %A0, align 4
br label %for.cond.pre
for.cond.pre:
%tmp = sext i32 %N to i64
br label %for.cond
for.cond: ; preds = %for.inc, %if.end
%indvars.iv1 = phi i64 [ %indvars.iv.next2, %for.inc ], [ 0, %for.cond.pre ]
%cmp = icmp slt i64 %indvars.iv1, %tmp
br i1 %cmp, label %for.body, label %for.end
for.body: ; preds = %for.cond
%arrayidx = getelementptr inbounds i32, i32* %B, i64 %indvars.iv1
%tmp3 = load i32, i32* %arrayidx, align 4
%arrayidx2 = getelementptr inbounds i32, i32* %A, i64 %indvars.iv1
%tmp4 = load i32, i32* %arrayidx2, align 4
%add = add nsw i32 %tmp4, %tmp3
store i32 %add, i32* %arrayidx2, align 4
br label %for.inc
for.inc: ; preds = %for.body
%indvars.iv.next2 = add nuw nsw i64 %indvars.iv1, 1
br label %for.cond
for.end: ; preds = %for.cond
%tobool3 = icmp eq i32 %timeit, 0
br i1 %tobool3, label %if.end.5, label %if.then.4
if.then.4: ; preds = %for.end
call void @timer_stop()
%na = fcmp one float 4.0, 5.0
br i1 %na, label %if.end.5, label %if.then.4.rem
if.then.4.rem: ; preds = %for.end
call void @timer_start()
br label %if.end.5
if.end.5: ; preds = %for.end, %if.then.4
%tmp5 = sext i32 %N to i64
br label %for.cond.7
for.cond.7: ; preds = %for.inc.15, %if.end.5
%indvars.iv = phi i64 [ %indvars.iv.next, %for.inc.15 ], [ 0, %if.end.5 ]
%cmp8 = icmp slt i64 %indvars.iv, %tmp5
br i1 %cmp8, label %for.body.9, label %for.end.17
for.body.9: ; preds = %for.cond.7
%arrayidx11 = getelementptr inbounds i32, i32* %B, i64 %indvars.iv
%tmp6 = load i32, i32* %arrayidx11, align 4
%arrayidx13 = getelementptr inbounds i32, i32* %A, i64 %indvars.iv
%tmp7 = load i32, i32* %arrayidx13, align 4
%add14 = add nsw i32 %tmp7, %tmp6
store i32 %add14, i32* %arrayidx13, align 4
br label %for.inc.15
for.inc.15: ; preds = %for.body.9
%indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
br label %for.cond.7
for.end.17: ; preds = %for.cond.7
%tobool18 = icmp eq i32 %timeit, 0
br i1 %tobool18, label %if.end.20, label %if.then.19
if.then.19: ; preds = %for.end.17
call void @timer_stop()
br label %if.end.20
if.end.20: ; preds = %for.end.17, %if.then.19
ret void
}
declare void @timer_start()
declare void @timer_stop()