derek.holloway
7502bf64a4
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47 lines
1.2 KiB
LLVM
47 lines
1.2 KiB
LLVM
; RUN: opt -S -passes='require<profile-summary>,function(codegenprepare)' -mtriple=x86_64-linux < %s | FileCheck %s
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;
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; Ensure that blocks that only contain @llvm.assume are removed completely
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; during CodeGenPrepare.
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; CHECK-LABEL: @simple(
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; CHECK-NEXT: end:
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; CHECK-NEXT: ret void
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define void @simple(i64 %addr, i1 %assumption) {
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%cmp1 = icmp eq i64 %addr, 0
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br i1 %cmp1, label %do_assume, label %end
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do_assume:
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tail call void @llvm.assume(i1 %assumption)
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br label %end
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end:
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ret void
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}
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; CHECK-LABEL: @complex_assume(
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; CHECK-NEXT: end:
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; CHECK-NEXT: ret void
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define void @complex_assume(i64 %addr, i1 %assumption_a, i1 %assumption_b,
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i64 %val_a, i64 %val_b) {
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%cmp1 = icmp eq i64 %addr, 0
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br i1 %cmp1, label %do_assume, label %end
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do_assume:
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call void @llvm.assume(i1 %assumption_a)
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call void @llvm.assume(i1 %assumption_b)
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%val_xor = xor i64 %val_a, %val_b
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%val_shifted = lshr i64 %val_xor, 7
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%assumption_c = trunc i64 %val_shifted to i1
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call void @llvm.assume(i1 %assumption_c)
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%assumption_d = call i1 @readonly_func(i64 %val_b)
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call void @llvm.assume(i1 %assumption_d)
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br label %end
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end:
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ret void
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}
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declare void @llvm.assume(i1 noundef)
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declare i1 @readonly_func(i64) nounwind readonly willreturn;
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