https://codereview.chromium.org/986643004/diff/1/src/arm/cpu-arm.cc
File src/arm/cpu-arm.cc (right):
https://codereview.chromium.org/986643004/diff/1/src/arm/cpu-arm.cc#newcode51
src/arm/cpu-arm.cc:51: register uint32_t scno asm("r7") =
__ARM_NR_cacheflush;
I don't think it's safe to assume that the compiler will actually load
the value into the register this way.
A peephole optimizer can't see into the asm block and won't realize that
the register is actually used. It may opt to remove the load.
https://codereview.chromium.org/986643004/
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