[AlignmentFromAssumptions] Don't divide by zero for unknown starting alignment

[oota-llvm.git] / test / Transforms / AlignmentFromAssumptions / start-unk.ll

diff --git a/test/Transforms/AlignmentFromAssumptions/start-unk.ll b/test/Transforms/AlignmentFromAssumptions/start-unk.ll
new file mode 100644 (file)
index 0000000..b7fe249
--- /dev/null
+++ b/test/Transforms/AlignmentFromAssumptions/start-unk.ll
@@ -0,0 +1,154 @@
+; RUN: opt -alignment-from-assumptions -S < %s | FileCheck %s
+target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
+target triple = "x86_64-unknown-linux-gnu"
+
+%type1 = type { %type2 }
+%type2 = type { [4 x i8] }
+
+; Function Attrs: nounwind
+declare void @llvm.assume(i1) #0
+
+; Function Attrs: nounwind readnone
+declare i32 @llvm.bswap.i32(i32) #1
+
+; Function Attrs: nounwind uwtable
+define void @test1() unnamed_addr #2 align 2 {
+
+; CHECK-LABEL: @test1
+
+entry:
+  br i1 undef, label %if.then, label %if.end
+
+if.then:                                          ; preds = %entry
+  unreachable
+
+if.end:                                           ; preds = %entry
+  br i1 undef, label %return, label %if.end8
+
+if.end8:                                          ; preds = %if.end
+  br i1 undef, label %if.then13, label %if.end14
+
+if.then13:                                        ; preds = %if.end8
+  unreachable
+
+if.end14:                                         ; preds = %if.end8
+  br i1 undef, label %cond.false.i129, label %cond.end.i136
+
+cond.false.i129:                                  ; preds = %if.end14
+  unreachable
+
+cond.end.i136:                                    ; preds = %if.end14
+  br i1 undef, label %land.lhs.true.i, label %if.end.i145
+
+land.lhs.true.i:                                  ; preds = %cond.end.i136
+  br i1 undef, label %if.end.i145, label %if.then.i137
+
+if.then.i137:                                     ; preds = %land.lhs.true.i
+  br i1 undef, label %cond.false8.i, label %cond.end9.i
+
+cond.false8.i:                                    ; preds = %if.then.i137
+  unreachable
+
+cond.end9.i:                                      ; preds = %if.then.i137
+  br i1 undef, label %if.then23, label %if.end24
+
+if.end.i145:                                      ; preds = %land.lhs.true.i, %cond.end.i136
+  unreachable
+
+if.then23:                                        ; preds = %cond.end9.i
+  unreachable
+
+if.end24:                                         ; preds = %cond.end9.i
+  br i1 undef, label %for.end, label %for.body.lr.ph
+
+for.body.lr.ph:                                   ; preds = %if.end24
+  unreachable
+
+for.end:                                          ; preds = %if.end24
+  br i1 undef, label %if.end123, label %if.then121
+
+if.then121:                                       ; preds = %for.end
+  unreachable
+
+if.end123:                                        ; preds = %for.end
+  br i1 undef, label %if.end150, label %if.then126
+
+if.then126:                                       ; preds = %if.end123
+  %ptrint.i.i185 = ptrtoint %type1* undef to i64
+  %maskedptr.i.i186 = and i64 %ptrint.i.i185, 1
+  %maskcond.i.i187 = icmp eq i64 %maskedptr.i.i186, 0
+  tail call void @llvm.assume(i1 %maskcond.i.i187) #0
+  %ret.0..sroa_cast.i.i188 = bitcast %type1* undef to i32*
+  %ret.0.copyload.i.i189 = load i32* %ret.0..sroa_cast.i.i188, align 2
+
+; CHECK: load {{.*}} align 2
+
+  %0 = tail call i32 @llvm.bswap.i32(i32 %ret.0.copyload.i.i189) #0
+  %conv131 = zext i32 %0 to i64
+  %add.ptr132 = getelementptr inbounds i8* undef, i64 %conv131
+  %1 = bitcast i8* %add.ptr132 to %type1*
+  br i1 undef, label %if.end150, label %if.end.i173
+
+if.end.i173:                                      ; preds = %if.then126
+  br i1 undef, label %test1.exit, label %cond.false.i.i.i.i174
+
+cond.false.i.i.i.i174:                            ; preds = %if.end.i173
+  unreachable
+
+test1.exit: ; preds = %if.end.i173
+  br i1 undef, label %test1a.exit, label %if.end.i124
+
+if.end.i124:                                      ; preds = %test1.exit
+  unreachable
+
+test1a.exit: ; preds = %test1.exit
+  br i1 undef, label %if.end150, label %for.body137.lr.ph
+
+for.body137.lr.ph:                                ; preds = %test1a.exit
+  br label %for.body137
+
+for.body137:                                      ; preds = %test1b.exit, %for.body137.lr.ph
+  %ShndxTable.0309 = phi %type1* [ %1, %for.body137.lr.ph ], [ %incdec.ptr, %test1b.exit ]
+  %ret.0..sroa_cast.i.i106 = bitcast %type1* %ShndxTable.0309 to i32*
+  br i1 undef, label %for.body137.if.end146_crit_edge, label %if.then140
+
+for.body137.if.end146_crit_edge:                  ; preds = %for.body137
+  %incdec.ptr = getelementptr inbounds %type1* %ShndxTable.0309, i64 1
+  br i1 undef, label %cond.false.i70, label %cond.end.i
+
+if.then140:                                       ; preds = %for.body137
+  %ret.0.copyload.i.i102 = load i32* %ret.0..sroa_cast.i.i106, align 2
+
+; CHECK: load {{.*}} align 2
+
+  unreachable
+
+cond.false.i70:                                   ; preds = %for.body137.if.end146_crit_edge
+  unreachable
+
+cond.end.i:                                       ; preds = %for.body137.if.end146_crit_edge
+  br i1 undef, label %test1b.exit, label %cond.false.i.i
+
+cond.false.i.i:                                   ; preds = %cond.end.i
+  unreachable
+
+test1b.exit: ; preds = %cond.end.i
+  br i1 undef, label %if.end150, label %for.body137
+
+if.end150:                                        ; preds = %test1b.exit, %test1a.exit, %if.then126, %if.end123
+  br i1 undef, label %for.end176, label %for.body155.lr.ph
+
+for.body155.lr.ph:                                ; preds = %if.end150
+  unreachable
+
+for.end176:                                       ; preds = %if.end150
+  unreachable
+
+return:                                           ; preds = %if.end
+  ret void
+}
+
+attributes #0 = { nounwind }
+attributes #1 = { nounwind readnone }
+attributes #2 = { nounwind uwtable }
+