Status: Accepted
Owner: ----
CC: [email protected], [email protected], [email protected],
[email protected], [email protected]
Labels: Type-Bug Priority-Medium
New issue 3149 by [email protected]: A64: lithium codegen should always
use the W registers when referring to 32 bit integers
http://code.google.com/p/v8/issues/detail?id=3149
The code generated for mjsunit/sin-cos in debug mode currently clobbers the
upper 32bit of the result register of the truncate-double-to-int-or-smi
step.
This causes a subsequent bounds-check step to fail. When I fix this step,
the subsequent load-keyed-external step crashes, because it uses the X
register as index (consisting of the actual index in the W part, and the
clobbered value in the upper 32 bit).
It appears that the invariant (32bit integer is always accessed via W
registers) doesn't hold everywhere.
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