2dd82a1c04
Summary:
This fixes the memory leak in bec37c3fc7
and re-delivers the reverted patch.
In this patch the DDG DAG is sorted topologically to put the
nodes in the graph in the order that would satisfy all
dependencies. This helps transformations that would like to
generate code based on the DDG. Since the DDG is a DAG a
reverse-post-order traversal would give us the topological
ordering. This patch also sorts the basic blocks passed to
the builder based on program order to ensure that the
dependencies are computed in the correct direction.
Authored By: bmahjour
Reviewer: Meinersbur, fhahn, myhsu, xtian, dmgreen, kbarton, jdoerfert
Reviewed By: Meinersbur
Subscribers: ychen, arphaman, simoll, a.elovikov, mgorny, hiraditya, jfb, wuzish, llvm-commits, jsji, Whitney, etiotto, ppc-slack
Tags: #llvm
Differential Revision: https://reviews.llvm.org/D70609
50 lines
1.8 KiB
LLVM
50 lines
1.8 KiB
LLVM
; RUN: opt < %s -disable-output "-passes=print<ddg>" 2>&1 | FileCheck %s
|
|
|
|
; CHECK-LABEL: 'DDG' for loop 'test1.for.body':
|
|
|
|
; CHECK: Node Address:[[ROOT:0x[0-9a-f]*]]:root
|
|
; CHECK-NEXT: Edges:
|
|
; CHECK-NEXT: [rooted] to [[N1:0x[0-9a-f]*]]
|
|
; CHECK-NEXT: [rooted] to [[N2:0x[0-9a-f]*]]
|
|
|
|
; CHECK: Node Address:[[N2]]:pi-block
|
|
; CHECK: %i1.02 = phi i64 [ 0, %for.body.lr.ph ], [ %inc, %test1.for.body ]
|
|
|
|
; CHECK: Node Address:[[N1]]:pi-block
|
|
; CHECK: %i2.03 = phi i64 [ 0, %for.body.lr.ph ], [ %inc2, %test1.for.body ]
|
|
|
|
;; // Two separate components in the graph. Root node must link to both.
|
|
;; void test1(unsigned long n, float * restrict a, float * restrict b) {
|
|
;; for (unsigned long i1 = 0, i2 = 0; i1 < n; i1++, i2++) {
|
|
;; a[i1] = 1;
|
|
;; b[i2] = -1;
|
|
;; }
|
|
;; }
|
|
|
|
define void @test1(i64 %n, float* noalias %a, float* noalias %b) {
|
|
entry:
|
|
%cmp1 = icmp ult i64 0, %n
|
|
br i1 %cmp1, label %for.body.lr.ph, label %for.end
|
|
|
|
for.body.lr.ph: ; preds = %entry
|
|
br label %test1.for.body
|
|
|
|
test1.for.body: ; preds = %for.body.lr.ph, %test1.for.body
|
|
%i2.03 = phi i64 [ 0, %for.body.lr.ph ], [ %inc2, %test1.for.body ]
|
|
%i1.02 = phi i64 [ 0, %for.body.lr.ph ], [ %inc, %test1.for.body ]
|
|
%arrayidx = getelementptr inbounds float, float* %a, i64 %i1.02
|
|
store float 1.000000e+00, float* %arrayidx, align 4
|
|
%arrayidx1 = getelementptr inbounds float, float* %b, i64 %i2.03
|
|
store float -1.000000e+00, float* %arrayidx1, align 4
|
|
%inc = add i64 %i1.02, 1
|
|
%inc2 = add i64 %i2.03, 1
|
|
%cmp = icmp ult i64 %inc, %n
|
|
br i1 %cmp, label %test1.for.body, label %for.cond.for.end_crit_edge
|
|
|
|
for.cond.for.end_crit_edge: ; preds = %test1.for.body
|
|
br label %for.end
|
|
|
|
for.end: ; preds = %for.cond.for.end_crit_edge, %entry
|
|
ret void
|
|
}
|