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[Hexagon] Allow non-returning calls in hardware loops

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@278416 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Krzysztof Parzyszek 2016-08-11 21:14:25 +00:00
parent 4df81566d5
commit 4110644365
4 changed files with 72 additions and 2 deletions
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4
lib/Target/Hexagon/HexagonHardwareLoops.cpp
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@ -962,8 +962,8 @@ bool HexagonHardwareLoops::isInvalidLoopOperation(const MachineInstr *MI,
// Call is not allowed because the callee may use a hardware loop except for
// the case when the call never returns.
if (MI->getDesc().isCall() && MI->getOpcode() != Hexagon::CALLv3nr)
return true;
if (MI->getDesc().isCall())
return !TII->doesNotReturn(*MI);
// Check if the instruction defines a hardware loop register.
for (unsigned i = 0, e = MI->getNumOperands(); i != e; ++i) {

6
lib/Target/Hexagon/HexagonInstrInfo.cpp
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@ -2972,6 +2972,12 @@ bool HexagonInstrInfo::canExecuteInBundle(const MachineInstr &First,
}
bool HexagonInstrInfo::doesNotReturn(const MachineInstr &CallMI) const {
unsigned Opc = CallMI.getOpcode();
return Opc == Hexagon::CALLv3nr || Opc == Hexagon::CALLRv3nr;
}
bool HexagonInstrInfo::hasEHLabel(const MachineBasicBlock *B) const {
for (auto &I : *B)
if (I.isEHLabel())

1
lib/Target/Hexagon/HexagonInstrInfo.h
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@ -360,6 +360,7 @@ public:
const MachineInstr &MI2) const;
bool canExecuteInBundle(const MachineInstr &First,
const MachineInstr &Second) const;
bool doesNotReturn(const MachineInstr &CallMI) const;
bool hasEHLabel(const MachineBasicBlock *B) const;
bool hasNonExtEquivalent(const MachineInstr &MI) const;
bool hasPseudoInstrPair(const MachineInstr &MI) const;

63
test/CodeGen/Hexagon/hwloop-noreturn-call.ll Normal file
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@ -0,0 +1,63 @@
; RUN: llc -march=hexagon < %s | FileCheck %s
target triple = "hexagon"
; CHECK-LABEL: danny:
; CHECK-DAG: loop0
; CHECK-DAG: call trap
define void @danny(i32* %p, i32 %n, i32 %k) #0 {
entry:
br label %for.body
for.body: ; preds = %entry
%t0 = phi i32 [ 0, %entry ], [ %t1, %for.cont ]
%t1 = add i32 %t0, 1
%t2 = getelementptr i32, i32* %p, i32 %t0
store i32 %t1, i32* %t2, align 4
%c = icmp sgt i32 %t1, %k
br i1 %c, label %noret, label %for.cont
for.cont:
%cmp = icmp slt i32 %t0, %n
br i1 %cmp, label %for.body, label %for.end
for.end: ; preds = %for.cond
ret void
noret:
call void @trap() #1
br label %for.cont
}
; CHECK-LABEL: sammy:
; CHECK-DAG: loop0
; CHECK-DAG: callr
define void @sammy(i32* %p, i32 %n, i32 %k, void (...)* %f) #0 {
entry:
br label %for.body
for.body: ; preds = %entry
%t0 = phi i32 [ 0, %entry ], [ %t1, %for.cont ]
%t1 = add i32 %t0, 1
%t2 = getelementptr i32, i32* %p, i32 %t0
store i32 %t1, i32* %t2, align 4
%c = icmp sgt i32 %t1, %k
br i1 %c, label %noret, label %for.cont
for.cont:
%cmp = icmp slt i32 %t0, %n
br i1 %cmp, label %for.body, label %for.end
for.end: ; preds = %for.cond
ret void
noret:
call void (...) %f() #1
br label %for.cont
}
declare void @trap() #1
attributes #0 = { nounwind "target-cpu"="hexagonv60" "target-features"="+hvx,-hvx-double" }
attributes #1 = { nounwind noreturn }