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