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ARM: Reduce amount of code generated for context save on deopt.

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BUG=none
TEST=none

Review URL: http://codereview.chromium.org//6930038

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@7873 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
This commit is contained in:
sgjesse@chromium.org 2011-05-12 13:33:14 +00:00
parent 89278730bb
commit b9c771c106
1 changed files with 35 additions and 18 deletions
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53
src/arm/deoptimizer-arm.cc
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@ -549,13 +549,21 @@ void Deoptimizer::EntryGenerator::Generate() {
const int kDoubleRegsSize =
kDoubleSize * DwVfpRegister::kNumAllocatableRegisters;
// Save all general purpose registers before messing with them.
__ sub(sp, sp, Operand(kDoubleRegsSize));
for (int i = 0; i < DwVfpRegister::kNumAllocatableRegisters; ++i) {
DwVfpRegister vfp_reg = DwVfpRegister::FromAllocationIndex(i);
int offset = i * kDoubleSize;
__ vstr(vfp_reg, sp, offset);
// Save all VFP registers before messing with them.
DwVfpRegister first = DwVfpRegister::FromAllocationIndex(0);
DwVfpRegister last =
DwVfpRegister::FromAllocationIndex(
DwVfpRegister::kNumAllocatableRegisters - 1);
ASSERT(last.code() > first.code());
ASSERT((last.code() - first.code()) ==
(DwVfpRegister::kNumAllocatableRegisters - 1));
#ifdef DEBUG
for (int i = 0; i <= (DwVfpRegister::kNumAllocatableRegisters - 1); i++) {
ASSERT((DwVfpRegister::FromAllocationIndex(i).code() <= last.code()) &&
(DwVfpRegister::FromAllocationIndex(i).code() >= first.code()));
}
#endif
__ vstm(db_w, sp, first, last);
// Push all 16 registers (needed to populate FrameDescription::registers_).
__ stm(db_w, sp, restored_regs | sp.bit() | lr.bit() | pc.bit());
@ -603,21 +611,30 @@ void Deoptimizer::EntryGenerator::Generate() {
// Copy core registers into FrameDescription::registers_[kNumRegisters].
ASSERT(Register::kNumRegisters == kNumberOfRegisters);
for (int i = 0; i < kNumberOfRegisters; i++) {
int offset = (i * kPointerSize) + FrameDescription::registers_offset();
__ ldr(r2, MemOperand(sp, i * kPointerSize));
__ str(r2, MemOperand(r1, offset));
}
ASSERT(kNumberOfRegisters % 2 == 0);
Label arm_loop;
__ add(r6, r1, Operand(FrameDescription::registers_offset()));
__ mov(r5, Operand(sp));
__ mov(r4, Operand(kNumberOfRegisters / 2));
__ bind(&arm_loop);
__ Ldrd(r2, r3, MemOperand(r5, kPointerSize * 2, PostIndex));
__ sub(r4, r4, Operand(1), SetCC);
__ Strd(r2, r3, MemOperand(r6, kPointerSize * 2, PostIndex));
__ b(gt, &arm_loop);
// Copy VFP registers to
// double_registers_[DoubleRegister::kNumAllocatableRegisters]
int double_regs_offset = FrameDescription::double_registers_offset();
for (int i = 0; i < DwVfpRegister::kNumAllocatableRegisters; ++i) {
int dst_offset = i * kDoubleSize + double_regs_offset;
int src_offset = i * kDoubleSize + kNumberOfRegisters * kPointerSize;
__ vldr(d0, sp, src_offset);
__ vstr(d0, r1, dst_offset);
}
Label vfp_loop;
__ add(r6, r1, Operand(FrameDescription::double_registers_offset()));
__ mov(r4, Operand(DwVfpRegister::kNumAllocatableRegisters));
__ bind(&vfp_loop);
__ Ldrd(r2, r3, MemOperand(r5, kDoubleSize, PostIndex));
__ sub(r4, r4, Operand(1), SetCC);
__ Strd(r2, r3, MemOperand(r6, kDoubleSize, PostIndex));
__ b(gt, &vfp_loop);
// Remove the bailout id, eventually return address, and the saved registers
// from the stack.