nomap_readonly.ll
1.64 KB
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; RUN: opt %loadPolly -polly-delicm -analyze < %s | FileCheck %s
;
; void func(double *A) {
; fsomeval = 21.0 + 21.0;
; for (int j = 0; j < 2; j += 1) { /* outer */
; double phi = 0.0;
; for (int i = 0; i < 4; i += 1) /* reduction */
; phi += 4.2;
; A[j] = fsomeval;
; }
; }
;
; Check that fsomeval is not mapped to A[j] because it is read-only.
; There is no advantage in mapping values not modified within the SCoP.
;
define void @func(double* noalias nonnull %A) {
entry:
%fsomeval = fadd double 21.0, 21.0
br label %outer.preheader
outer.preheader:
br label %outer.for
outer.for:
%j = phi i32 [0, %outer.preheader], [%j.inc, %outer.inc]
%j.cmp = icmp slt i32 %j, 2
br i1 %j.cmp, label %reduction.preheader, label %outer.exit
reduction.preheader:
br label %reduction.for
reduction.for:
%i = phi i32 [0, %reduction.preheader], [%i.inc, %reduction.inc]
%phi = phi double [0.0, %reduction.preheader], [%add, %reduction.inc]
%i.cmp = icmp slt i32 %i, 4
br i1 %i.cmp, label %body, label %reduction.exit
body:
%add = fadd double %phi, 4.2
br label %reduction.inc
reduction.inc:
%i.inc = add nuw nsw i32 %i, 1
br label %reduction.for
reduction.exit:
%A_idx = getelementptr inbounds double, double* %A, i32 %j
store double %fsomeval, double* %A_idx
br label %outer.inc
outer.inc:
%j.inc = add nuw nsw i32 %j, 1
br label %outer.for
outer.exit:
br label %return
return:
ret void
}
; CHECK: Statistics {
; CHECK: Compatible overwrites: 1
; CHECK: }
; CHECK: No modification has been made