[SimplifyCFG] NFC, update Switch tests to better examine successive patches

Also add baseline tests to show effect of later patches.

There were a couple of regressions here that were never caught,
but my patch set that this is a preparation to will fix them.

Differential Revision: https://reviews.llvm.org/D61150

llvm-svn: 363226

1 files changed, 78 insertions, 75 deletions

diff --git a/llvm/test/Transforms/SimplifyCFG/switch_thread.ll b/llvm/test/Transforms/SimplifyCFG/switch_thread.ll
index 32e0325df7f..e38865699d2 100644
--- a/llvm/test/Transforms/SimplifyCFG/switch_thread.ll
+++ b/llvm/test/Transforms/SimplifyCFG/switch_thread.ll
@@ -1,3 +1,4 @@
+; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
 ; RUN: opt < %s -simplifycfg -S | FileCheck %s
 
 ; Test that we can thread a simple known condition through switch statements.
@@ -9,97 +10,70 @@ declare void @foo2()
 declare void @DEAD()
 
 define void @test1(i32 %V) {
-        switch i32 %V, label %A [
-                 i32 4, label %T
-                 i32 17, label %Done
-                 i32 1234, label %A
-        ]
-;; V == 4 if we get here.
-T:              ; preds = %0
-        call void @foo1( )
-        ;; This switch is always statically determined.
-        switch i32 %V, label %A2 [
-                 i32 4, label %B
-                 i32 17, label %C
-                 i32 42, label %C
-        ]
-A2:             ; preds = %T
-        call void @DEAD( )
-        call void @DEAD( )
-        ;; always true
-        %cond2 = icmp eq i32 %V, 4              ; <i1> [#uses=1]
-        br i1 %cond2, label %Done, label %C
-A:              ; preds = %0, %0
-        call void @foo1( )
-        ;; always true
-        %cond = icmp ne i32 %V, 4               ; <i1> [#uses=1]
-        br i1 %cond, label %Done, label %C
-Done:           ; preds = %B, %A, %A2, %0
-        ret void
-B:              ; preds = %T
-        call void @foo2( )
-        ;; always true
-        %cond3 = icmp eq i32 %V, 4              ; <i1> [#uses=1]
-        br i1 %cond3, label %Done, label %C
-C:              ; preds = %B, %A, %A2, %T, %T
-        call void @DEAD( )
-        ret void
-
 ; CHECK-LABEL: @test1(
-; CHECK-NEXT:    switch i32 %V, label %A [
-; CHECK-NEXT:    i32 4, label %T
-; CHECK-NEXT:    i32 17, label %Done
+; CHECK-NEXT:    switch i32 [[V:%.*]], label [[A:%.*]] [
+; CHECK-NEXT:    i32 4, label [[T:%.*]]
+; CHECK-NEXT:    i32 17, label [[DONE:%.*]]
 ; CHECK-NEXT:    ]
 ; CHECK:       T:
 ; CHECK-NEXT:    call void @foo1()
 ; CHECK-NEXT:    call void @foo2()
-; CHECK-NEXT:    br label %Done
+; CHECK-NEXT:    br label [[DONE]]
 ; CHECK:       A:
 ; CHECK-NEXT:    call void @foo1()
-; CHECK-NEXT:    br label %Done
+; CHECK-NEXT:    br label [[DONE]]
 ; CHECK:       Done:
 ; CHECK-NEXT:    ret void
+;
+  switch i32 %V, label %A [
+  i32 4, label %T
+  i32 17, label %Done
+  i32 1234, label %A
+  ]
+;; V == 4 if we get here.
+T:              ; preds = %0
+  call void @foo1( )
+  ;; This switch is always statically determined.
+  switch i32 %V, label %A2 [
+  i32 4, label %B
+  i32 17, label %C
+  i32 42, label %C
+  ]
+A2:             ; preds = %T
+  call void @DEAD( )
+  call void @DEAD( )
+  ;; always true
+  %cond2 = icmp eq i32 %V, 4              ; <i1> [#uses=1]
+  br i1 %cond2, label %Done, label %C
+A:              ; preds = %0, %0
+  call void @foo1( )
+  ;; always true
+  %cond = icmp ne i32 %V, 4               ; <i1> [#uses=1]
+  br i1 %cond, label %Done, label %C
+Done:           ; preds = %B, %A, %A2, %0
+  ret void
+B:              ; preds = %T
+  call void @foo2( )
+  ;; always true
+  %cond3 = icmp eq i32 %V, 4              ; <i1> [#uses=1]
+  br i1 %cond3, label %Done, label %C
+C:              ; preds = %B, %A, %A2, %T, %T
+  call void @DEAD( )
+  ret void
+
 }
 
 define void @test2(i32 %V) {
-        switch i32 %V, label %A [
-                 i32 4, label %T
-                 i32 17, label %D
-                 i32 1234, label %E
-        ]
-;; V != 4, 17, 1234 here.
-A:              ; preds = %0
-        call void @foo1( )
-        ;; This switch is always statically determined.
-        switch i32 %V, label %E [
-                 i32 4, label %C
-                 i32 17, label %C
-                 i32 42, label %D
-        ]
-;; unreacahble.
-C:              ; preds = %A, %A
-        call void @DEAD( )
-        ret void
-T:              ; preds = %0
-        call void @foo1( )
-        call void @foo1( )
-        ret void
-D:              ; preds = %A, %0
-        call void @foo1( )
-        ret void
-E:              ; preds = %A, %0
-        ret void
-
 ; CHECK-LABEL: @test2(
-; CHECK-NEXT:    switch i32 %V, label %A [
-; CHECK-NEXT:    i32 4, label %T
-; CHECK-NEXT:    i32 17, label %D
-; CHECK-NEXT:    i32 1234, label %E
+; CHECK-NEXT:    switch i32 [[V:%.*]], label [[A:%.*]] [
+; CHECK-NEXT:    i32 4, label [[T:%.*]]
+; CHECK-NEXT:    i32 17, label [[D:%.*]]
+; CHECK-NEXT:    i32 1234, label [[E:%.*]]
 ; CHECK-NEXT:    ]
 ; CHECK:       A:
 ; CHECK-NEXT:    call void @foo1()
-; CHECK-NEXT:    [[COND:%.*]] = icmp eq i32 %V, 42
-; CHECK-NEXT:    br i1 [[COND]], label %D, label %E
+; CHECK-NEXT:    [[COND:%.*]] = icmp eq i32 [[V]], 42
+; CHECK-NEXT:    br i1 [[COND]], label [[D]], label [[E]]
 ; CHECK:       T:
 ; CHECK-NEXT:    call void @foo1()
 ; CHECK-NEXT:    call void @foo1()
@@ -109,5 +83,34 @@ E:              ; preds = %A, %0
 ; CHECK-NEXT:    ret void
 ; CHECK:       E:
 ; CHECK-NEXT:    ret void
+;
+  switch i32 %V, label %A [
+  i32 4, label %T
+  i32 17, label %D
+  i32 1234, label %E
+  ]
+;; V != 4, 17, 1234 here.
+A:              ; preds = %0
+  call void @foo1( )
+  ;; This switch is always statically determined.
+  switch i32 %V, label %E [
+  i32 4, label %C
+  i32 17, label %C
+  i32 42, label %D
+  ]
+;; unreacahble.
+C:              ; preds = %A, %A
+  call void @DEAD( )
+  ret void
+T:              ; preds = %0
+  call void @foo1( )
+  call void @foo1( )
+  ret void
+D:              ; preds = %A, %0
+  call void @foo1( )
+  ret void
+E:              ; preds = %A, %0
+  ret void
+
 }