a1ba971cd8
This change introduces register re-mapping to avoid assignment hazards in binary expressions. Expressions that cause problems typically have the form y = x + (x = 4);. The problem occurs because the lhs value evaluates to the register holding x. The rhs updates that register and then applying the operation would use the new value as the lhs. By tracking loads and stores in binary expressions the generator is now able to detect when condition occurs and uses a temporary register for the rhs value. When the binary expression evaluation is complete the variable is updated with the latest temporary. A new bytecode Mov performs this update without touching the accumulator. BUG=v8:4280 LOG=N Review URL: https://codereview.chromium.org/1412683011 Cr-Commit-Position: refs/heads/master@{#32141} |
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| test-bytecode-generator.cc | ||
| test-interpreter.cc | ||