https://codereview.chromium.org/863633002/diff/80001/src/arm/simulator-arm.cc
File src/arm/simulator-arm.cc (right):
https://codereview.chromium.org/863633002/diff/80001/src/arm/simulator-arm.cc#newcode1922
src/arm/simulator-arm.cc:1922: const uint64_t kDefaultNaN =
V8_UINT64_C(0x7FF8000000000000);
We already have kFP64DefaultNaN (in src/arm64/instructions-arm64.h).
https://codereview.chromium.org/863633002/diff/120001/src/arm64/lithium-codegen-arm64.cc
File src/arm64/lithium-codegen-arm64.cc (right):
https://codereview.chromium.org/863633002/diff/120001/src/arm64/lithium-codegen-arm64.cc#newcode3610
src/arm64/lithium-codegen-arm64.cc:3610: DeoptimizeIf(eq, instr,
"hole");
Untested suggestion:
__ Ldr(scratch, mem_op);
__ Eor(scratch, scratch, kHoleNaNInt64);
__ DeoptimizeIfZero(scratch, instr, "hole");
It should assemble to just three instructions, since kHoleNaNInt64 is
representable as a logical immediate:
ldr x16, [mem_op]
eor x16, x16, #0x7ff000007ff00000
cbz x16, deopt_label
https://codereview.chromium.org/863633002/
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