Juneyoung Lee bef5114d08 [AssumeBundles] offset should be added to correctly calculate align ... This is a patch to fix the bug in alignment calculation (see https://reviews.llvm.org/D90529#2619492). Consider this code: ``` call void @llvm.assume(i1 true) ["align"(i32* %a, i32 32, i32 28)] %arrayidx = getelementptr inbounds i32, i32* %a, i64 -1 ; aligment of %arrayidx? ``` The llvm.assume guarantees that `%a - 28` is 32-bytes aligned, meaning that `%a` is 32k + 28 for some k. Therefore `a - 4` cannot be 32-bytes aligned but the existing code was calculating the pointer as 32-bytes aligned. The reason why this happened is as follows. `DiffSCEV` stores `%arrayidx - %a` which is -4. `OffSCEV` stores the offset value of “align”, which is 28. `DiffSCEV` + `OffSCEV` = 24 should be used for `a - 4`'s offset from 32k, but `DiffSCEV` - `OffSCEV` = 32 was being used instead. Reviewed By: Tyker Differential Revision: https://reviews.llvm.org/D98759		2021-04-02 12:32:05 +09:00
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amdgpu-crash.ll
simple32.ll	[AssumeBundles] offset should be added to correctly calculate align	2021-04-02 12:32:05 +09:00
simple.ll	[AssumeBundles] offset should be added to correctly calculate align	2021-04-02 12:32:05 +09:00
start-unk.ll