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-rw-r--r--llvm/test/Transforms/SimplifyCFG/switch-on-const-select.ll191
1 files changed, 87 insertions, 104 deletions
diff --git a/llvm/test/Transforms/SimplifyCFG/switch-on-const-select.ll b/llvm/test/Transforms/SimplifyCFG/switch-on-const-select.ll
index 98c434a5a0e..165e5b264ae 100644
--- a/llvm/test/Transforms/SimplifyCFG/switch-on-const-select.ll
+++ b/llvm/test/Transforms/SimplifyCFG/switch-on-const-select.ll
@@ -1,158 +1,141 @@
-; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
; RUN: opt < %s -simplifycfg -S | FileCheck -enable-var-scope %s
; Test basic folding to a conditional branch.
define i32 @foo(i64 %x, i64 %y) nounwind {
; CHECK-LABEL: @foo(
-; CHECK-NEXT: entry:
-; CHECK-NEXT: [[EQ:%.*]] = icmp eq i64 [[X:%.*]], [[Y:%.*]]
-; CHECK-NEXT: br i1 [[EQ]], label [[B:%.*]], label [[SWITCH:%.*]]
-; CHECK: switch:
-; CHECK-NEXT: [[LT:%.*]] = icmp slt i64 [[X]], [[Y]]
-; CHECK-NEXT: br i1 [[LT]], label [[A:%.*]], label [[B]]
-; CHECK: a:
-; CHECK-NEXT: tail call void @bees.a() #0
-; CHECK-NEXT: ret i32 1
-; CHECK: b:
-; CHECK-NEXT: [[RETVAL:%.*]] = phi i32 [ 0, [[SWITCH]] ], [ 2, [[ENTRY:%.*]] ]
-; CHECK-NEXT: tail call void @bees.b() #0
-; CHECK-NEXT: ret i32 [[RETVAL]]
-;
entry:
- %eq = icmp eq i64 %x, %y
- br i1 %eq, label %b, label %switch
+ %eq = icmp eq i64 %x, %y
+ br i1 %eq, label %b, label %switch
switch:
- %lt = icmp slt i64 %x, %y
- %qux = select i1 %lt, i32 0, i32 2
- switch i32 %qux, label %bees [
- i32 0, label %a
- i32 1, label %b
- i32 2, label %b
- ]
+ %lt = icmp slt i64 %x, %y
+; CHECK: br i1 %lt, label %a, label %b
+ %qux = select i1 %lt, i32 0, i32 2
+ switch i32 %qux, label %bees [
+ i32 0, label %a
+ i32 1, label %b
+ i32 2, label %b
+ ]
a:
- tail call void @bees.a() nounwind
- ret i32 1
+ tail call void @bees.a() nounwind
+ ret i32 1
+; CHECK: b:
+; CHECK-NEXT: %retval = phi i32 [ 0, %switch ], [ 2, %entry ]
b:
- %retval = phi i32 [0, %switch], [0, %switch], [2, %entry]
- tail call void @bees.b() nounwind
- ret i32 %retval
+ %retval = phi i32 [0, %switch], [0, %switch], [2, %entry]
+ tail call void @bees.b() nounwind
+ ret i32 %retval
+; CHECK-NOT: bees:
bees:
- tail call void @llvm.trap() nounwind
- unreachable
+ tail call void @llvm.trap() nounwind
+ unreachable
}
; Test basic folding to an unconditional branch.
define i32 @bar(i64 %x, i64 %y) nounwind {
; CHECK-LABEL: @bar(
-; CHECK-NEXT: entry:
-; CHECK-NEXT: tail call void @bees.a() #0
-; CHECK-NEXT: ret i32 0
-;
entry:
- %lt = icmp slt i64 %x, %y
- %qux = select i1 %lt, i32 0, i32 2
- switch i32 %qux, label %bees [
- i32 0, label %a
- i32 1, label %b
- i32 2, label %a
- ]
+; CHECK-NEXT: entry:
+; CHECK-NEXT: tail call void @bees.a() [[$NUW:#[0-9]+]]
+; CHECK-NEXT: ret i32 0
+ %lt = icmp slt i64 %x, %y
+ %qux = select i1 %lt, i32 0, i32 2
+ switch i32 %qux, label %bees [
+ i32 0, label %a
+ i32 1, label %b
+ i32 2, label %a
+ ]
a:
- %retval = phi i32 [0, %entry], [0, %entry], [1, %b]
- tail call void @bees.a() nounwind
- ret i32 0
+ %retval = phi i32 [0, %entry], [0, %entry], [1, %b]
+ tail call void @bees.a() nounwind
+ ret i32 0
b:
- tail call void @bees.b() nounwind
- br label %a
+ tail call void @bees.b() nounwind
+ br label %a
bees:
- tail call void @llvm.trap() nounwind
- unreachable
+ tail call void @llvm.trap() nounwind
+ unreachable
}
; Test the edge case where both values from the select are the default case.
define void @bazz(i64 %x, i64 %y) nounwind {
; CHECK-LABEL: @bazz(
-; CHECK-NEXT: entry:
-; CHECK-NEXT: tail call void @bees.b() #0
-; CHECK-NEXT: ret void
-;
entry:
- %lt = icmp slt i64 %x, %y
- %qux = select i1 %lt, i32 10, i32 12
- switch i32 %qux, label %b [
- i32 0, label %a
- i32 1, label %bees
- i32 2, label %bees
- ]
+; CHECK-NEXT: entry:
+; CHECK-NEXT: tail call void @bees.b() [[$NUW]]
+; CHECK-NEXT: ret void
+ %lt = icmp slt i64 %x, %y
+ %qux = select i1 %lt, i32 10, i32 12
+ switch i32 %qux, label %b [
+ i32 0, label %a
+ i32 1, label %bees
+ i32 2, label %bees
+ ]
a:
- tail call void @bees.a() nounwind
- ret void
+ tail call void @bees.a() nounwind
+ ret void
b:
- tail call void @bees.b() nounwind
- ret void
+ tail call void @bees.b() nounwind
+ ret void
bees:
- tail call void @llvm.trap()
- unreachable
+ tail call void @llvm.trap()
+ unreachable
}
; Test the edge case where both values from the select are equal.
define void @quux(i64 %x, i64 %y) nounwind {
; CHECK-LABEL: @quux(
-; CHECK-NEXT: entry:
-; CHECK-NEXT: tail call void @bees.a() #0
-; CHECK-NEXT: ret void
-;
entry:
- %lt = icmp slt i64 %x, %y
- %qux = select i1 %lt, i32 0, i32 0
- switch i32 %qux, label %b [
- i32 0, label %a
- i32 1, label %bees
- i32 2, label %bees
- ]
+; CHECK-NEXT: entry:
+; CHECK-NEXT: tail call void @bees.a() [[$NUW]]
+; CHECK-NEXT: ret void
+ %lt = icmp slt i64 %x, %y
+ %qux = select i1 %lt, i32 0, i32 0
+ switch i32 %qux, label %b [
+ i32 0, label %a
+ i32 1, label %bees
+ i32 2, label %bees
+ ]
a:
- tail call void @bees.a() nounwind
- ret void
+ tail call void @bees.a() nounwind
+ ret void
b:
- tail call void @bees.b() nounwind
- ret void
+ tail call void @bees.b() nounwind
+ ret void
bees:
- tail call void @llvm.trap()
- unreachable
+ tail call void @llvm.trap()
+ unreachable
}
; A final test, for phi node munging.
define i32 @xyzzy(i64 %x, i64 %y) {
; CHECK-LABEL: @xyzzy(
-; CHECK-NEXT: entry:
-; CHECK-NEXT: [[EQ:%.*]] = icmp eq i64 [[X:%.*]], [[Y:%.*]]
-; CHECK-NEXT: [[LT:%.*]] = icmp slt i64 [[X]], [[Y]]
-; CHECK-NEXT: [[SPEC_SELECT:%.*]] = select i1 [[LT]], i32 -1, i32 1
-; CHECK-NEXT: [[VAL:%.*]] = select i1 [[EQ]], i32 0, i32 [[SPEC_SELECT]]
-; CHECK-NEXT: ret i32 [[VAL]]
-;
entry:
- %eq = icmp eq i64 %x, %y
- br i1 %eq, label %r, label %cont
+ %eq = icmp eq i64 %x, %y
+ br i1 %eq, label %r, label %cont
cont:
- %lt = icmp slt i64 %x, %y
- %qux = select i1 %lt, i32 0, i32 2
- switch i32 %qux, label %bees [
- i32 0, label %a
- i32 1, label %r
- i32 2, label %r
- ]
+; CHECK: %lt = icmp slt i64 %x, %y
+ %lt = icmp slt i64 %x, %y
+; CHECK-NEXT: select i1 %lt, i32 -1, i32 1
+ %qux = select i1 %lt, i32 0, i32 2
+ switch i32 %qux, label %bees [
+ i32 0, label %a
+ i32 1, label %r
+ i32 2, label %r
+ ]
r:
- %val = phi i32 [0, %entry], [1, %cont], [1, %cont]
- ret i32 %val
+ %val = phi i32 [0, %entry], [1, %cont], [1, %cont]
+ ret i32 %val
a:
- ret i32 -1
+ ret i32 -1
+; CHECK-NOT: bees:
bees:
- tail call void @llvm.trap()
- unreachable
+ tail call void @llvm.trap()
+ unreachable
}
declare void @llvm.trap() nounwind noreturn
declare void @bees.a() nounwind
declare void @bees.b() nounwind
+; CHECK: attributes [[$NUW]] = { nounwind }
; CHECK: attributes #1 = { cold noreturn nounwind }
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