Commiteb4e18f

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py: Add compiler optimisation for conditions in parenthesis.

Optimises: if () -> if False if (x,...) -> if True if (a and b) -> if a and b

1 parent15d2fe8 commiteb4e18fCopy full SHA for eb4e18f

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+17

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Lines changed: 17 additions & 0 deletions

Original file line number	Diff line number	Diff line change
`@@ -713,6 +713,23 @@ STATIC void c_if_cond(compiler_t *comp, mp_parse_node_t pn, bool jump_if, int la`
`713`	`713`	`}elseif (MP_PARSE_NODE_STRUCT_KIND(pns)==PN_not_test_2) {`
`714`	`714`	`c_if_cond(comp,pns->nodes[0], !jump_if,label);`
`715`	`715`	`return;`
	`716`	`+ }elseif (MP_PARSE_NODE_STRUCT_KIND(pns)==PN_atom_paren) {`
	`717`	`+// cond is something in parenthesis`
	`718`	`+if (MP_PARSE_NODE_IS_NULL(pns->nodes[0])) {`
	`719`	`+// empty tuple, acts as false for the condition`
	`720`	`+if (jump_if== false) {`
	`721`	`+EMIT_ARG(jump,label);`
	`722`	`+ }`
	`723`	`+ }elseif (MP_PARSE_NODE_IS_STRUCT_KIND(pns->nodes[0],PN_testlist_comp)) {`
	`724`	`+// non-empty tuple, acts as true for the condition`
	`725`	`+if (jump_if== true) {`
	`726`	`+EMIT_ARG(jump,label);`
	`727`	`+ }`
	`728`	`+ }else {`
	`729`	`+// parenthesis around 1 item, is just that item`
	`730`	`+c_if_cond(comp,pns->nodes[0],jump_if,label);`
	`731`	`+ }`
	`732`	`+return;`
`716`	`733`	`}`
`717`	`734`	`}`
`718`	`735`

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