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[PowerPC] Fix the incorrect iterator inside peephole

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Instruction selection can insert nodes into the underlying list after the root
node so iterating will thereby miss it. We should NOT assume that, the root node
is the last element in the DAG nodelist.

Patch by: steven.zhang (Qing Shan Zhang)

Differential Revision: https://reviews.llvm.org/D47437

llvm-svn: 333415
This commit is contained in:
Lei Huang 2018-05-29 13:38:56 +00:00
parent 5077aac217
commit 843ab43bc4
2 changed files with 7 additions and 10 deletions
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9
lib/Target/PowerPC/PPCISelDAGToDAG.cpp
View File

@ -5169,8 +5169,7 @@ void PPCDAGToDAGISel::foldBoolExts(SDValue &Res, SDNode *&N) {
}
void PPCDAGToDAGISel::PreprocessISelDAG() {
SelectionDAG::allnodes_iterator Position(CurDAG->getRoot().getNode());
++Position;
SelectionDAG::allnodes_iterator Position = CurDAG->allnodes_end();
bool MadeChange = false;
while (Position != CurDAG->allnodes_begin()) {
@ -5858,8 +5857,7 @@ void PPCDAGToDAGISel::PeepholePPC64ZExt() {
// unnecessary. When that happens, we remove it here, and redefine the
// relevant 32-bit operation to be a 64-bit operation.
SelectionDAG::allnodes_iterator Position(CurDAG->getRoot().getNode());
++Position;
SelectionDAG::allnodes_iterator Position = CurDAG->allnodes_end();
bool MadeChange = false;
while (Position != CurDAG->allnodes_begin()) {
@ -6016,8 +6014,7 @@ void PPCDAGToDAGISel::PeepholePPC64() {
if (PPCSubTarget->isDarwin() || !PPCSubTarget->isPPC64())
return;
SelectionDAG::allnodes_iterator Position(CurDAG->getRoot().getNode());
++Position;
SelectionDAG::allnodes_iterator Position = CurDAG->allnodes_end();
while (Position != CurDAG->allnodes_begin()) {
SDNode *N = &*--Position;

8
test/CodeGen/PowerPC/ppcf128-endian.ll
View File

@ -43,10 +43,10 @@ entry:
; CHECK: .LCPI[[LC]]_1:
; CHECK: .long 0
; CHECK: @caller_const
; CHECK: addi [[REG0:[0-9]+]], {{[0-9]+}}, .LCPI[[LC]]_0
; CHECK: addi [[REG1:[0-9]+]], {{[0-9]+}}, .LCPI[[LC]]_1
; CHECK: lfs 1, 0([[REG0]])
; CHECK: lfs 2, 0([[REG1]])
; CHECK: addis [[REG0:[0-9]+]], 2, .LCPI[[LC]]_0@toc@ha
; CHECK: addis [[REG1:[0-9]+]], 2, .LCPI[[LC]]_1@toc@ha
; CHECK: lfs 1, .LCPI[[LC]]_0@toc@l([[REG0]])
; CHECK: lfs 2, .LCPI[[LC]]_1@toc@l([[REG1]])
; CHECK: bl test
define ppc_fp128 @result() {