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Unified Diff: src/ic/arm64/stub-cache-arm64.cc

Issue 2161153002: [ic] Fix megamorphic stub cache probing on some platforms. (Closed) Base URL: https://chromium.googlesource.com/v8/v8.git@master
Patch Set: Addressing comments Created 4 years, 5 months ago
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Index: src/ic/arm64/stub-cache-arm64.cc
diff --git a/src/ic/arm64/stub-cache-arm64.cc b/src/ic/arm64/stub-cache-arm64.cc
index bd219b0e33851d8735e69df1c77256ab99a49f1c..75369a3983de4e653c14923ac4cf306d79200c69 100644
--- a/src/ic/arm64/stub-cache-arm64.cc
+++ b/src/ic/arm64/stub-cache-arm64.cc
@@ -24,8 +24,11 @@ namespace internal {
// 'receiver', 'name' and 'offset' registers are preserved on miss.
static void ProbeTable(StubCache* stub_cache, MacroAssembler* masm,
Code::Flags flags, StubCache::Table table,
- Register receiver, Register name, Register offset,
- Register scratch, Register scratch2, Register scratch3) {
+ Register receiver, Register name,
+ // The offset is scaled by 4, based on
+ // kCacheIndexShift, which is two bits
+ Register offset, Register scratch, Register scratch2,
+ Register scratch3) {
// Some code below relies on the fact that the Entry struct contains
// 3 pointers (name, code, map).
STATIC_ASSERT(sizeof(StubCache::Entry) == (3 * kPointerSize));
@@ -48,7 +51,9 @@ static void ProbeTable(StubCache* stub_cache, MacroAssembler* masm,
// Calculate the base address of the entry.
__ Mov(scratch, key_offset);
- __ Add(scratch, scratch, Operand(scratch3, LSL, kPointerSizeLog2));
+ __ Add(
+ scratch, scratch,
+ Operand(scratch3, LSL, kPointerSizeLog2 - StubCache::kCacheIndexShift));
// Check that the key in the entry matches the name.
__ Ldr(scratch2, MemOperand(scratch));
@@ -128,22 +133,22 @@ void StubCache::GenerateProbe(MacroAssembler* masm, Register receiver,
__ JumpIfSmi(receiver, &miss);
// Compute the hash for primary table.
- __ Ldr(scratch, FieldMemOperand(name, Name::kHashFieldOffset));
+ __ Ldr(scratch.W(), FieldMemOperand(name, Name::kHashFieldOffset));
__ Ldr(extra, FieldMemOperand(receiver, HeapObject::kMapOffset));
__ Add(scratch, scratch, extra);
__ Eor(scratch, scratch, flags);
- // We shift out the last two bits because they are not part of the hash.
- __ Ubfx(scratch, scratch, kCacheIndexShift,
- CountTrailingZeros(kPrimaryTableSize, 64));
+ __ And(scratch, scratch,
+ Operand((kPrimaryTableSize - 1) << kCacheIndexShift));
// Probe the primary table.
ProbeTable(this, masm, flags, kPrimary, receiver, name, scratch, extra,
extra2, extra3);
// Primary miss: Compute hash for secondary table.
- __ Sub(scratch, scratch, Operand(name, LSR, kCacheIndexShift));
- __ Add(scratch, scratch, flags >> kCacheIndexShift);
- __ And(scratch, scratch, kSecondaryTableSize - 1);
+ __ Sub(scratch, scratch, Operand(name));
+ __ Add(scratch, scratch, Operand(flags));
+ __ And(scratch, scratch,
+ Operand((kSecondaryTableSize - 1) << kCacheIndexShift));
// Probe the secondary table.
ProbeTable(this, masm, flags, kSecondary, receiver, name, scratch, extra,
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