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llvm-project/polly/test/ScopInfo/truncate-3.ll

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SCEVAffinator: pass parameter-only set to addRestriction if BB=nullptr Assumptions can either be added for a given basic block, in which case the set describing the assumptions is expected to match the dimensions of its domain. In case no basic block is provided a parameter-only set is expected to describe the assumption. The piecewise expressions that are generated by the SCEVAffinator sometimes have a zero-dimensional domain (e.g., [p] -> { [] : p <= -129 or p >= 128 }), which looks similar to a parameter-only domain, but is still a set domain. This change adds an assert that checks that we always pass parameter domains to addAssumptions if BB is empty to make mismatches here fail early. We also change visitTruncExpr to always convert to parameter sets, if BB is null. This change resolves http://llvm.org/PR30941 Another alternative to this change would have been to inspect all code to make sure we directly generate in the SCEV affinator parameter sets in case of empty domains. However, this would likely complicate the code which combines parameter and non-parameter domains when constructing a statement domain. We might still consider doing this at some point, but as this likely requires several non-local changes this should probably be done as a separate refactoring. Reported-by: Eli Friedman <efriedma@codeaurora.org> llvm-svn: 286444
2016-11-10 19:44:10 +08:00
; RUN: opt %loadPolly -polly-scops -pass-remarks-analysis="polly-scops" \
; RUN: -disable-output < %s 2>&1 | FileCheck %s
; CHECK: Signed-unsigned restriction: [p] -> { : p <= -129 or p >= 128 }
; Verify that this test case does not crash when we try to model it.
; At some point we tried to insert a restriction:
; [p] -> { : p <= -129 or p >= 128 }
; which resulted in a crash.
target datalayout = "e-m:e-p:32:32-i64:64-v128:64:128-a:0:32-n32-S64"
define void @wobble(i16* %A, i32 %p) {
bb:
%tmp1 = and i32 %p, 255
br label %bb4
bb4: ; preds = %bb4, %bb
%indvar = phi i16* [ %A, %bb ], [ %indvar.next, %bb4 ]
%val = load i16, i16* %indvar
%indvar.next = getelementptr inbounds i16, i16* %indvar, i32 %tmp1
br i1 false, label %bb4, label %bb9
bb9: ; preds = %bb4
ret void
}