SimplifyLibCalls: Add missing legalize check on various printf to puts and

putchar transforms, their return values are not compatible.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@125442 91177308-0d34-0410-b5e6-96231b3b80d8

test/Transforms/SimplifyLibCalls/Printf.ll

@@ -1,23 +1,36 @@
 ; RUN: opt < %s -simplify-libcalls -S -o %t
 ; RUN: FileCheck < %t %s
 
-; CHECK-NOT: call{{.*}}printf
-; CHECK: putchar
-
 @str = internal constant [13 x i8] c"hello world\0A\00"         ; <[13 x i8]*> [#uses=1]
 @str1 = internal constant [2 x i8] c"h\00"              ; <[2 x i8]*> [#uses=1]
 
-define void @foo() {
+declare i32 @printf(i8*, ...)
+
+; CHECK: define void @f0
+; CHECK-NOT: printf
+; CHECK: }
+define void @f0() {
 entry:
         %tmp1 = tail call i32 (i8*, ...)* @printf( i8* getelementptr ([13 x i8]* @str, i32 0, i32 0) )         ; <i32> [#uses=0]
         ret void
 }
 
-declare i32 @printf(i8*, ...)
-
-define void @bar() {
+; CHECK: define void @f1
+; CHECK-NOT: printf
+; CHECK: }
+define void @f1() {
 entry:
         %tmp1 = tail call i32 (i8*, ...)* @printf( i8* getelementptr ([2 x i8]* @str1, i32 0, i32 0) )         ; <i32> [#uses=0]
         ret void
 }
 
+; Verify that we don't turn this into a putchar call (thus changing the return
+; value).
+;
+; CHECK: define i32 @f2
+; CHECK: printf
+; CHECK: }
+define i32 @f2() {
+  %call = call i32 (i8*, ...)* @printf(i8* getelementptr inbounds ([2 x i8]* @str1, i32 0, i32 0))
+  ret i32 %call
+}