tree 35090f3191532c21e840ec395a938898ffdb16d7
parent 6bdbc4a6dfdc95a9479e4ebccc9f4c02e614fdb1
author James Price <jrprice@google.com> 1648765810 +0000
committer James Price <jrprice@google.com> 1648765810 +0000

Add ExpandCompoundAssignment transform

This transform converts compound assignment statements into regular
assignments, hoisting LHS expressions and converting for-loops and
else-if statements if necessary.

The vector-component case needs particular care, as we cannot take the
address of a vector component. We need to capture a pointer to the
whole vector and also the component index expression:

// Before
vector_array[foo()][bar()] *= 2.0;

// After:
let _vec = &vector_array[foo()];
let _idx = bar();
(*_vec)[_idx] = (*_vec)[_idx] * 2.0;

Bug: tint:1325
Change-Id: I8b9b31fc9ac4b3697f954100ceb4be24d063bca6
Reviewed-on: https://dawn-review.googlesource.com/c/tint/+/85282
Reviewed-by: Antonio Maiorano <amaiorano@google.com>
Kokoro: Kokoro <noreply+kokoro@google.com>