winch: Save state before emitting br_if
#8886
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Fixes: bytecodealliance#8848 Similar to all the control instructions, any state must be explicitly saved before emitting the code for `br_if`. This commit ensures that live locals and registers are explicilty saved before emitting the code for `br_if`. Prior to this commit, live locals and registers were not saved every time causing incorrect behavior in cases where the calculation of the conditional argument didn't trigger a spill. This change introduces the explicit spill after calculating the branch condition argument to minimize memory traffic in case the conditional is already in a register.
br_ifbr_if
fitzgen
approved these changes
Jun 28, 2024
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Fixes: #8848
Similar to all the control instructions, any state must be explicitly saved before emitting the code for
br_if.This commit ensures that live locals and registers are explicilty saved before emitting the code for
br_if. Prior to this commit, live locals and registers were not saved every time causing incorrect behavior in cases where the calculation of the conditional argument didn't trigger a spill.This change introduces the explicit spill after calculating the branch condition argument to minimize memory traffic in case the conditional is already in a register.