When emitting SPIR-V code for frexp, avoid access
beyond the end of the operands vector. When constructing
the OpExtInst, construct a new arguments vector instead of
modifying the existing operands vector. In the case of OpFrexp,
well need that last operand later on to generate the store.
Fixes https://github.com/KhronosGroup/glslang/issues/110
Change-Id: Ibc380fadf5e600ac491932e9ecef7afe2d72fd7f
Structured control-flow rules allow leaving the middle of a construct through
a return, but not through a jump to a block that does a return.
Addresses issue #58.
This generally simplifies access chain generation, with far fewer type conversions.
It is particularly important to future SPIR-V changes where there is less aggregate
type uniqueness due to carrying different layout information with the type.
If this breaks your AST consumer, best is to modify it to test
against the enum values instead of doing string comparisons on
built-in function names. This is the reason the change was made.
If you need the old behavior, you should be able to get it back by changing
PureOperatorBuiltins to be false instead of true. This path will work for
a while, but is marked deprecated.
Also, the old behavior is tagged as release 2.4.
There will be subsequent commits to refine semantics, esp. version-specific semantics,
as well as I/O functionality and restrictions.
Note: I'm getting white-space differences in the preprocessor test results,
which I'm not checking in. I think they need to be tagged as binary or something.
The loop test is always emitted before the loop body.
For do-while loops, use a phi node to track whether we're
on the first loop iteration, and only check the loop test
on the second and subsequent iterations.
For do-while loops, the loop test branch no longer occurs
at the top of the loop, so it must get its own selection
merge instruction.
A block can't be the target of more than one merge instruction.
So when the loop test executes after the body (as in do-while in GLSL)
we need to introduce a dummy block to be the target of the selection
merge just before the loop test conditional branch.
The other arm of the branch exits the loop and hence is the
"break block" exception in the structured control flow rules.
