b569ec6de6
If the GEP is nusw/inbounds and has all-non-negative offsets infer nuw as well. This doesn't have measurable compile-time impact. Proof: https://alive2.llvm.org/ce/z/ihztLy
29 lines
914 B
LLVM
29 lines
914 B
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
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; RUN: opt -passes="cgscc(function(sccp,simplifycfg))" < %s -S | FileCheck %s
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define i32 @baz(i32 %y, i1 %b) {
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; CHECK-LABEL: @baz(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: br i1 [[B:%.*]], label [[LAB:%.*]], label [[FOR_COND:%.*]]
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; CHECK: for.cond:
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; CHECK-NEXT: [[P_0:%.*]] = phi ptr [ null, [[FOR_COND]] ], [ blockaddress(@baz, [[LAB]]), [[ENTRY:%.*]] ]
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; CHECK-NEXT: [[INCDEC_PTR:%.*]] = getelementptr inbounds nuw i8, ptr [[P_0]], i64 1
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; CHECK-NEXT: br label [[FOR_COND]]
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; CHECK: lab:
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; CHECK-NEXT: ret i32 0
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;
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entry:
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br i1 %b, label %lab, label %for.cond.preheader
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for.cond.preheader:
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br label %for.cond
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for.cond:
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%p.0 = phi ptr [ null, %for.cond ], [ blockaddress(@baz, %lab), %for.cond.preheader ]
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%incdec.ptr = getelementptr inbounds i8, ptr %p.0, i64 1
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br label %for.cond
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lab:
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ret i32 0
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}
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