The following re-orders the newly added code sinking pass before
the last phiopt pass which performs hoisting of adjacent loads
with the intent to enable if-conversion on those.
I've added the aarch64 specific testcase from the PR.
2022-03-16 Richard Biener <rguenther@suse.de>
PR tree-optimization/102008
* passes.def: Move the added code sinking pass before the
preceeding phiopt pass.
* gcc.target/aarch64/pr102008.c: New testcase.
/* After late CD DCE we rewrite no longer addressed locals into SSA
form if possible. */
NEXT_PASS (pass_forwprop);
+ NEXT_PASS (pass_sink_code);
NEXT_PASS (pass_phiopt, false /* early_p */);
NEXT_PASS (pass_fold_builtins);
NEXT_PASS (pass_optimize_widening_mul);
- NEXT_PASS (pass_sink_code);
NEXT_PASS (pass_store_merging);
NEXT_PASS (pass_tail_calls);
/* If DCE is not run before checking for uninitialized uses,
--- /dev/null
+/* { dg-do compile } */
+/* { dg-options "-O2" } */
+
+struct Foo { int a; int b; };
+
+int test(int side, const struct Foo *foo) {
+ if (side == 1) return foo->a;
+ return foo->b;
+}
+
+/* We want to if-convert the load, not the address. */
+/* { dg-final { scan-assembler-not "add" } } */
+/* { dg-final { scan-assembler-times "csel" 1 } } */