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Update IR.md #1

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Jul 12, 2019
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Update IR.md #1

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4 changes: 2 additions & 2 deletions doc/IR.md
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Expand Up @@ -476,7 +476,7 @@ SwitchInst | _
Description | The ‘switch‘ instruction is used to transfer control to one of different places.
Example | %0 = SwitchInst %input, %default, [%val0, %block0], [%val1, %block1] ..
Arguments | The instruction accepts an input, a default block, and one or more pairs of value-destination values. The value must be a primitive JS type, and the destination must be a basic block within the current function.
Semantics | The semantic of the instruction is identical to a squence of 'if' statements that compare the value of the input to each of the case statements. Repeating the same value is not allowed.
Semantics | The semantic of the instruction is identical to a sequence of 'if' statements that compare the value of the input to each of the case statements. Repeating the same value is not allowed.
Effects | May read and write memory.

### GetPNamesInst
Expand Down Expand Up @@ -505,7 +505,7 @@ CatchInst | _
Description | This instruction catches an exception, and returns that exception.
Example | %0 = CatchInst
Arguments | This instruction does not have arguments.
Sementics | This instruction will be generated for each catch block and for each finally block. The current exception will be returned. CatchInst can only show up at the beginning of a basic block. The coverage and depth inforamtion for the CatchInst will be constructed dynamically later during bytecode generation.
Semantics | This instruction will be generated for each catch block and for each finally block. The current exception will be returned. CatchInst can only show up at the beginning of a basic block. The coverage and depth information for the CatchInst will be constructed dynamically later during bytecode generation.
Effects | May read and write memory.

### ThrowInst
Expand Down