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llvm-project/llvm/test/Analysis/ScalarEvolution/pr22179.ll

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Fix PR22179. We were incorrectly inferring nsw for certain SCEVs. We can be more aggressive here (see Richard Smith's comment on http://llvm.org/bugs/show_bug.cgi?id=22179) but this change just focuses on correctness. Differential Revision: http://reviews.llvm.org/D6914 llvm-svn: 225591
2015-01-11 07:41:24 +08:00
; RUN: opt -analyze -scalar-evolution < %s | FileCheck %s
%struct.anon = type { i8 }
%struct.S = type { i32 }
@a = common global %struct.anon zeroinitializer, align 1
@b = common global %struct.S zeroinitializer, align 4
; Function Attrs: nounwind ssp uwtable
define i32 @main() {
; CHECK-LABEL: Classifying expressions for: @main
store i8 0, i8* getelementptr inbounds (%struct.anon* @a, i64 0, i32 0), align 1
br label %loop
loop:
%storemerge1 = phi i8 [ 0, %0 ], [ %inc, %loop ]
[opaque pointer type] Add textual IR support for explicit type parameter to load instruction Essentially the same as the GEP change in r230786. A similar migration script can be used to update test cases, though a few more test case improvements/changes were required this time around: (r229269-r229278) import fileinput import sys import re pat = re.compile(r"((?:=|:|^)\s*load (?:atomic )?(?:volatile )?(.*?))(| addrspace\(\d+\) *)\*($| *(?:%|@|null|undef|blockaddress|getelementptr|addrspacecast|bitcast|inttoptr|\[\[[a-zA-Z]|\{\{).*$)") for line in sys.stdin: sys.stdout.write(re.sub(pat, r"\1, \2\3*\4", line)) Reviewers: rafael, dexonsmith, grosser Differential Revision: http://reviews.llvm.org/D7649 llvm-svn: 230794
2015-02-28 05:17:42 +08:00
%m = load volatile i32, i32* getelementptr inbounds (%struct.S* @b, i64 0, i32 0), align 4
Fix PR22179. We were incorrectly inferring nsw for certain SCEVs. We can be more aggressive here (see Richard Smith's comment on http://llvm.org/bugs/show_bug.cgi?id=22179) but this change just focuses on correctness. Differential Revision: http://reviews.llvm.org/D6914 llvm-svn: 225591
2015-01-11 07:41:24 +08:00
%inc = add nuw i8 %storemerge1, 1
; CHECK: %inc = add nuw i8 %storemerge1, 1
; CHECK-NEXT: --> {1,+,1}<nuw><%loop>
; CHECK-NOT: --> {1,+,1}<nuw><nsw><%loop>
%exitcond = icmp eq i8 %inc, -128
br i1 %exitcond, label %exit, label %loop
exit:
store i8 -128, i8* getelementptr inbounds (%struct.anon* @a, i64 0, i32 0), align 1
ret i32 0
}