Imported Upstream version 5.18.0.167

Former-commit-id: 289509151e0fee68a1b591a20c9f109c3c789d3a

external/llvm/test/Transforms/SimplifyCFG/2008-05-16-PHIBlockMerge.ll

@@ -1,131 +0,0 @@
-; RUN: opt < %s -simplifycfg -S > %t
-; RUN: not grep "^BB.tomerge" %t
-; RUN: grep "^BB.nomerge" %t | count 4
-
-; ModuleID = '<stdin>' 
-declare i1 @foo()
-
-declare i1 @bar(i32)
-
-; This function can't be merged
-define void @a() {
-entry:
-	br label %BB.nomerge
-
-BB.nomerge:		; preds = %Common, %entry
-        ; This phi has a conflicting value (0) with below phi (2), so blocks
-        ; can't be merged.
-	%a = phi i32 [ 1, %entry ], [ 0, %Common ]		; <i32> [#uses=1]
-	br label %Succ
-
-Succ:		; preds = %Common, %BB.nomerge
-	%b = phi i32 [ %a, %BB.nomerge ], [ 2, %Common ]		; <i32> [#uses=0]
-	%conde = call i1 @foo( )		; <i1> [#uses=1]
-	br i1 %conde, label %Common, label %Exit
-
-Common:		; preds = %Succ
-	%cond = call i1 @foo( )		; <i1> [#uses=1]
-	br i1 %cond, label %BB.nomerge, label %Succ
-
-Exit:		; preds = %Succ
-	ret void
-}
-
-; This function can't be merged
-define void @b() {
-entry:
-	br label %BB.nomerge
-
-BB.nomerge:		; preds = %Common, %entry
-	br label %Succ
-
-Succ:		; preds = %Common, %BB.nomerge
-        ; This phi has confliction values for Common and (through BB) Common,
-        ; blocks can't be merged
-	%b = phi i32 [ 1, %BB.nomerge ], [ 2, %Common ]		; <i32> [#uses=0]
-	%conde = call i1 @foo( )		; <i1> [#uses=1]
-	br i1 %conde, label %Common, label %Exit
-
-Common:		; preds = %Succ
-	%cond = call i1 @foo( )		; <i1> [#uses=1]
-	br i1 %cond, label %BB.nomerge, label %Succ
-
-Exit:		; preds = %Succ
-	ret void
-}
-
-; This function can't be merged (for keeping canonical loop structures)
-define void @c() {
-entry:
-	br label %BB.nomerge
-
-BB.nomerge:		; preds = %Common, %entry
-	br label %Succ
-
-Succ:		; preds = %Common, %BB.tomerge, %Pre-Exit
-        ; This phi has identical values for Common and (through BB) Common,
-        ; blocks can't be merged
-	%b = phi i32 [ 1, %BB.nomerge ], [ 1, %Common ], [ 2, %Pre-Exit ]
-	%conde = call i1 @foo( )		; <i1> [#uses=1]
-	br i1 %conde, label %Common, label %Pre-Exit
-
-Common:		; preds = %Succ
-	%cond = call i1 @foo( )		; <i1> [#uses=1]
-	br i1 %cond, label %BB.nomerge, label %Succ
-
-Pre-Exit:       ; preds = %Succ
-        ; This adds a backedge, so the %b phi node gets a third branch and is
-        ; not completely trivial
-	%cond2 = call i1 @foo( )		; <i1> [#uses=1]
-	br i1 %cond2, label %Succ, label %Exit
-        
-Exit:		; preds = %Pre-Exit
-	ret void
-}
-
-; This function can't be merged (for keeping canonical loop structures)
-define void @d() {
-entry:
-	br label %BB.nomerge
-
-BB.nomerge:		; preds = %Common, %entry
-        ; This phi has a matching value (0) with below phi (0), so blocks
-        ; can be merged.
-	%a = phi i32 [ 1, %entry ], [ 0, %Common ]		; <i32> [#uses=1]
-	br label %Succ
-
-Succ:		; preds = %Common, %BB.tomerge
-	%b = phi i32 [ %a, %BB.nomerge ], [ 0, %Common ]		; <i32> [#uses=0]
-	%conde = call i1 @foo( )		; <i1> [#uses=1]
-	br i1 %conde, label %Common, label %Exit
-
-Common:		; preds = %Succ
-	%cond = call i1 @foo( )		; <i1> [#uses=1]
-	br i1 %cond, label %BB.nomerge, label %Succ
-
-Exit:		; preds = %Succ
-	ret void
-}
-
-; This function can be merged
-define void @e() {
-entry:
-	br label %Succ
-
-Succ:		; preds = %Use, %entry
-        ; This phi is used somewhere else than Succ, but this should not prevent
-        ; merging this block
-	%a = phi i32 [ 1, %entry ], [ 0, %Use ]		; <i32> [#uses=1]
-	br label %BB.tomerge
-
-BB.tomerge:		; preds = %BB.tomerge
-	%conde = call i1 @foo( )		; <i1> [#uses=1]
-	br i1 %conde, label %Use, label %Exit
-
-Use:		; preds = %Succ
-	%cond = call i1 @bar( i32 %a )		; <i1> [#uses=1]
-	br i1 %cond, label %Succ, label %Exit
-
-Exit:		; preds = %Use, %Succ
-	ret void
-}