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Commit f084a571 by Karl Schimpf
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Add NOP to ARM IR lowering.

This change allows pnacl-sz to randomly insert NOPs into the generated code, as is already done with X86. BUG=None R=eholk@chromium.org, stichnot@chromium.org Review URL: https://codereview.chromium.org/1670413002 .
parent 00c30380
Showing with 117 additions and 4 deletions
src/IceInstARM32.cpp
......@@ -1221,6 +1221,12 @@ template <> void InstARM32Tst::emitIAS(const Cfg *Func) const {
emitUsingTextFixup(Func);
}
InstARM32Dmb::InstARM32Dmb(Cfg *Func)
: InstARM32Pred(Func, InstARM32::Dmb, 0, nullptr, CondARM32::AL) {}
InstARM32Nop::InstARM32Nop(Cfg *Func)
: InstARM32Pred(Func, InstARM32::Nop, 0, nullptr, CondARM32::AL) {}
InstARM32Vcmp::InstARM32Vcmp(Cfg *Func, Variable *Src0, Operand *Src1,
CondARM32::Cond Predicate)
: InstARM32Pred(Func, InstARM32::Vcmp, 2, nullptr, Predicate) {
......@@ -1240,9 +1246,6 @@ InstARM32Vabs::InstARM32Vabs(Cfg *Func, Variable *Dest, Variable *Src,
addSource(Src);
}
InstARM32Dmb::InstARM32Dmb(Cfg *Func)
: InstARM32Pred(Func, InstARM32::Dmb, 0, nullptr, CondARM32::AL) {}
// ======================== Dump routines ======================== //
// Two-addr ops
......@@ -2447,6 +2450,26 @@ void InstARM32Dmb::dump(const Cfg *Func) const {
"sy";
}
void InstARM32Nop::emit(const Cfg *Func) const {
if (!BuildDefs::dump())
return;
assert(getSrcSize() == 0);
Func->getContext()->getStrEmit() << "\t"
<< "nop";
}
void InstARM32Nop::emitIAS(const Cfg *Func) const {
assert(getSrcSize() == 0);
Func->getAssembler<ARM32::AssemblerARM32>()->nop();
}
void InstARM32Nop::dump(const Cfg *Func) const {
if (!BuildDefs::dump())
return;
assert(getSrcSize() == 0);
Func->getContext()->getStrDump() << "nop";
}
void OperandARM32Mem::emit(const Cfg *Func) const {
if (!BuildDefs::dump())
return;
......
src/IceInstARM32.h
......@@ -397,6 +397,7 @@ public:
Ldrex,
Lsl,
Lsr,
Nop,
Mla,
Mls,
Mov,
......@@ -1494,6 +1495,24 @@ private:
explicit InstARM32Dmb(Cfg *Func);
};
class InstARM32Nop final : public InstARM32Pred {
InstARM32Nop() = delete;
InstARM32Nop(const InstARM32Nop &) = delete;
InstARM32Nop &operator=(const InstARM32Nop &) = delete;
public:
static InstARM32Nop *create(Cfg *Func) {
return new (Func->allocate<InstARM32Nop>()) InstARM32Nop(Func);
}
void emit(const Cfg *Func) const override;
void emitIAS(const Cfg *Func) const override;
void dump(const Cfg *Func) const override;
static bool classof(const Inst *Instr) { return isClassof(Instr, Nop); }
private:
explicit InstARM32Nop(Cfg *Func);
};
// Declare partial template specializations of emit() methods that already have
// default implementations. Without this, there is the possibility of ODR
// violations and link errors.
......
src/IceTargetLoweringARM32.cpp
......@@ -5360,7 +5360,7 @@ void TargetARM32::randomlyInsertNop(float Probability,
RandomNumberGenerator &RNG) {
RandomNumberGeneratorWrapper RNGW(RNG);
if (RNGW.getTrueWithProbability(Probability)) {
UnimplementedError(Func->getContext()->getFlags());
_nop();
}
}
......
src/IceTargetLoweringARM32.h
......@@ -418,6 +418,8 @@ protected:
}
}
void _nop() { Context.insert<InstARM32Nop>(); }
// Generates a vmov instruction to extract the given index from a vector
// register.
void _extractelement(Variable *Dest, Variable *Src0, uint32_t Index,
......
tests_lit/llvm2ice_tests/nop-insertion.ll
......@@ -17,6 +17,10 @@
; RUN: %p2i -i %s --filetype=asm --sandbox -a -sz-seed=1 -nop-insertion \
; RUN: -nop-insertion-percentage=50 -max-nops-per-instruction=1 \
; RUN: | FileCheck %s --check-prefix=SANDBOX50
; RUN: %p2i -i %s --filetype=asm --sandbox --target=arm32 -a -sz-seed=1 \
; RUN: -nop-insertion -nop-insertion-percentage=110 \
; RUN: -max-nops-per-instruction=2 \
; RUN: | FileCheck %s --check-prefix=ARM110P2
define internal <4 x i32> @mul_v4i32(<4 x i32> %a, <4 x i32> %b) {
......@@ -137,4 +141,69 @@ entry:
; SANDBOX50: jmp *%ecx
; SANDBOX50: .bundle_unlock
; ARM110P2: mul_v4i32:
; ARM110P2-NEXT: .Lmul_v4i32$entry:
; ARM110P2-NEXT: .bundle_lock
; ARM110P2-NEXT: sub sp, sp, #48
; ARM110P2-NEXT: bic sp, sp, #3221225472
; ARM110P2-NEXT: .bundle_unlock
; ARM110P2-NEXT: nop
; ARM110P2-NEXT: nop
; ARM110P2-NEXT: .bundle_lock
; ARM110P2-NEXT: add ip, sp, #32
; ARM110P2-NEXT: bic ip, ip, #3221225472
; ARM110P2-NEXT: vst1.32 q0, [ip]
; ARM110P2-NEXT: .bundle_unlock
; ARM110P2-NEXT: nop
; ARM110P2-NEXT: nop
; ARM110P2-NEXT: # [sp, #32] = def.pseudo
; ARM110P2-NEXT: .bundle_lock
; ARM110P2-NEXT: add ip, sp, #16
; ARM110P2-NEXT: bic ip, ip, #3221225472
; ARM110P2-NEXT: vst1.32 q1, [ip]
; ARM110P2-NEXT: .bundle_unlock
; ARM110P2-NEXT: nop
; ARM110P2-NEXT: nop
; ARM110P2-NEXT: # [sp, #16] = def.pseudo
; ARM110P2-NEXT: .bundle_lock
; ARM110P2-NEXT: add ip, sp, #32
; ARM110P2-NEXT: bic ip, ip, #3221225472
; ARM110P2-NEXT: vld1.32 q0, [ip]
; ARM110P2-NEXT: .bundle_unlock
; ARM110P2-NEXT: nop
; ARM110P2-NEXT: nop
; ARM110P2-NEXT: .bundle_lock
; ARM110P2-NEXT: add ip, sp, #16
; ARM110P2-NEXT: bic ip, ip, #3221225472
; ARM110P2-NEXT: vld1.32 q1, [ip]
; ARM110P2-NEXT: .bundle_unlock
; ARM110P2-NEXT: nop
; ARM110P2-NEXT: nop
; ARM110P2-NEXT: vmul.i32 q0, q0, q1
; ARM110P2-NEXT: nop
; ARM110P2-NEXT: nop
; ARM110P2-NEXT: .bundle_lock
; ARM110P2-NEXT: vst1.32 q0, [sp]
; ARM110P2-NEXT: .bundle_unlock
; ARM110P2-NEXT: nop
; ARM110P2-NEXT: nop
; ARM110P2-NEXT: # [sp] = def.pseudo
; ARM110P2-NEXT: .bundle_lock
; ARM110P2-NEXT: vld1.32 q0, [sp]
; ARM110P2-NEXT: .bundle_unlock
; ARM110P2-NEXT: nop
; ARM110P2-NEXT: nop
; ARM110P2-NEXT: .bundle_lock
; ARM110P2-NEXT: add sp, sp, #48
; ARM110P2-NEXT: bic sp, sp, #3221225472
; ARM110P2-NEXT: .bundle_unlock
; ARM110P2-NEXT: nop
; ARM110P2-NEXT: nop
; ARM110P2-NEXT: .bundle_lock
; ARM110P2-NEXT: bic lr, lr, #3221225487
; ARM110P2-NEXT: bx lr
; ARM110P2-NEXT: .bundle_unlock
; ARM110P2-NEXT: nop
; ARM110P2-NEXT: nop
}
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