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...nteract undesirable Ind Var transformations but it's not implemented at the moment? I think I've managed to come up with a small reproducer that can also exhibit similar problem on x86, here it is: https://godbolt.org/z/_wxzut<https://urldefense.proofpoint.com/v2/url?u=https-3A__godbolt.org_z_-5Fwxzut&d=DwMD-g&c=DPL6_X_6JkXFx7AXWqB0tg&r=VEV8gWVf26SDOqiMtTxnBloZmItAauQlSqznsCc0KxY&m=xzJTtah1fNUz56fRe1yh10OCSBFg7IbzUhFcn8BPyJk&s=-qhi7IRwOrqjcv_cxlhP6lbVWspNKWeDT4amCIHR1sU&e=> As you can see, when rewriteLoopExitValues is not disabled Clang generates worse code d...

...nteract undesirable Ind Var transformations but it's not implemented at the moment? I think I've managed to come up with a small reproducer that can also exhibit similar problem on x86, here it is: https://godbolt.org/z/_wxzut<https://urldefense.proofpoint.com/v2/url?u=https-3A__godbolt.org_z_-5Fwxzut&d=DwMD-g&c=DPL6_X_6JkXFx7AXWqB0tg&r=VEV8gWVf26SDOqiMtTxnBloZmItAauQlSqznsCc0KxY&m=xzJTtah1fNUz56fRe1yh10OCSBFg7IbzUhFcn8BPyJk&s=-qhi7IRwOrqjcv_cxlhP6lbVWspNKWeDT4amCIHR1sU&e=> As you can see, when rewriteLoopExitValues is not disabled Clang generates worse code d...

Hi Hal, I see. So LSR could theoretically counteract undesirable Ind Var transformations but it's not implemented at the moment? I think I've managed to come up with a small reproducer that can also exhibit similar problem on x86, here it is: https://godbolt.org/z/_wxzut As you can see, when rewriteLoopExitValues is not disabled Clang generates worse code due to additional spills,

So I've been narrowing down a very fun issue in our Burst compiler stack with respect to noalias support, and I've managed to basically boil this down to the following failure (see https://godbolt.org/z/-mdjPV): int called(int* __restrict__ a, int* b, int* c) { return *a + *b + *c; } int foo(int * x, int * y) { return *x + *y + called(x, x, y); } int bar(int * x, int * y) { return

...ters == funtimes So I've been narrowing down a very fun issue in our Burst compiler stack with respect to noalias support, and I've managed to basically boil this down to the following failure (see https://godbolt.org/z/-mdjPV<https://urldefense.proofpoint.com/v2/url?u=https-3A__godbolt.org_z_-2DmdjPV&d=DwMFaQ&c=DPL6_X_6JkXFx7AXWqB0tg&r=ELyOnT0WepII6UnFk-OSzxlGOXXSfAvOLT6E8iPwwJk&m=aOzDT5OLTyJR4khihblFI8hsLwAXqccKhWgUehiRiR4&s=XWkvlt9v4v-iBS_HFjm8-b3FQVTO3UCsgWPECbAPkX4&e=>): int called(int* __restrict__ a, int* b, int* c) { return *a + *b + *c; } int foo(int...