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BPF: emit an error message for unsupported signed division operation

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Signed-off-by: Yonghong Song <yhs@plumgrid.com>
Signed-off-by: Alexei Starovoitov <ast@fb.com>

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@263842 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Alexei Starovoitov 2016-03-18 22:02:47 +00:00
parent fd9f306bd8
commit 2462cfbd35
2 changed files with 21 additions and 0 deletions
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12
lib/Target/BPF/BPFISelDAGToDAG.cpp
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@ -130,6 +130,18 @@ SDNode *BPFDAGToDAGISel::Select(SDNode *Node) {
// tablegen selection should be handled here.
switch (Opcode) {
default: break;
case ISD::SDIV: {
DebugLoc Empty;
const DebugLoc &DL = Node->getDebugLoc();
if (DL != Empty)
errs() << "Error at line " << DL.getLine() << ": ";
else
errs() << "Error: ";
errs() << "Unsupport signed division for DAG: ";
Node->dump(CurDAG);
errs() << "Please convert to unsigned div/mod.\n";
break;
}
case ISD::INTRINSIC_W_CHAIN: {
unsigned IntNo = cast<ConstantSDNode>(Node->getOperand(1))->getZExtValue();
switch (IntNo) {

9
test/CodeGen/BPF/sdiv_error.ll Normal file
View File

@ -0,0 +1,9 @@
; RUN: not llc -march=bpf < %s 2> %t1
; RUN: FileCheck %s < %t1
; CHECK: Unsupport signed division
; Function Attrs: norecurse nounwind readnone
define i32 @test(i32 %len) #0 {
%1 = srem i32 %len, 15
ret i32 %1
}