[Webkit-unassigned] [Bug 149340] Implement type conversion instructions in WebAssembly
bugzilla-daemon at webkit.org
bugzilla-daemon at webkit.org
Fri Sep 18 10:09:02 PDT 2015
https://bugs.webkit.org/show_bug.cgi?id=149340
--- Comment #3 from Mark Lam <mark.lam at apple.com> ---
Comment on attachment 261498
--> https://bugs.webkit.org/attachment.cgi?id=261498
Patch
View in context: https://bugs.webkit.org/attachment.cgi?id=261498&action=review
> Source/JavaScriptCore/wasm/WASMFunctionCompiler.h:378
> + int buildConvertType(int, WASMExpressionType fromType, WASMExpressionType toType, WASMTypeConversion conversion)
Shouldn't the first argument and return type be of type ContextExpression?
> Source/JavaScriptCore/wasm/WASMFunctionCompiler.h:382
> + load32(temporaryAddress(m_tempStackTop - 1), GPRInfo::regT0);
Everything looks fine, but I'm unfamiliar with this expression of "temporaryAddress(m_tempStackTop - 1)". Just to make sure there is no bug here, can you explain what it means? Specifically,
1. why is it called a "temporary" address?
2. why is it referring to "m_tempStackTop - 1"? My interpretation is that you're operating on the operand at the top of the stack. Hence, my naive expectation is that you would want "m_tempStackTop" instead?
Can you please clarify? Thanks.
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