forked from OSchip/llvm-project
89 lines
2.2 KiB
LLVM
89 lines
2.2 KiB
LLVM
; RUN: opt %loadPolly -polly-delicm -analyze < %s | FileCheck %s
|
|
;
|
|
; void func(double *A) {
|
|
; for (int j = 0; j < 2; j += 1) { /* outer */
|
|
; double phi = 0.0;
|
|
; for (int i = 0; i < 4; i += 1) /* reduction */
|
|
; if (phi < 0.0)
|
|
; A[j] = undef;
|
|
; phi += 4.2;
|
|
; A[j] = phi;
|
|
; }
|
|
; }
|
|
;
|
|
; The MAY_WRITE in reduction.for.true conflict with a write of %phi to
|
|
; A[j] if %phi would be mapped to it. Being a MAY_WRITE avoids being target
|
|
; of a mapping itself.
|
|
;
|
|
; TODO: There is actually no reason why these conflict. The MAY_WRITE is an
|
|
; explicit write, defined to occur always before all implicit writes as the
|
|
; write of %phi would be. There is currently no differentiation between
|
|
; implicit and explicit writes in Polly.
|
|
;
|
|
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]
|
|
%A_idx = getelementptr inbounds double, double* %A, i32 %j
|
|
%phi.cmp = fcmp ogt double %phi, 0.0
|
|
br i1 %phi.cmp, label %reduction.for.true, label %reduction.for.unconditional
|
|
|
|
reduction.for.true:
|
|
store double undef, double* %A_idx
|
|
br label %reduction.for.unconditional
|
|
|
|
reduction.for.unconditional:
|
|
%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:
|
|
store double %phi, 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
|