Optimize printf -> iprintf if there are no floating point arguments

and iprintf is available on the target. Currently iprintf is only
marked as being available on the XCore.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@126935 91177308-0d34-0410-b5e6-96231b3b80d8

test/Transforms/SimplifyLibCalls/iprintf.ll

@@ -0,0 +1,29 @@
+; RUN: opt < %s -simplify-libcalls -S -o %t
+; RUN: FileCheck < %t %s
+target datalayout = "e-p:32:32:32-i1:8:32-i8:8:32-i16:16:32-i32:32:32-i64:32:32-f32:32:32-f64:32:32-v64:64:64-v128:128:128-a0:0:32"
+target triple = "xcore-xmos-elf"
+
+@.str = internal constant [4 x i8] c"%f\0A\00"		; <[4 x i8]*> [#uses=1]
+@.str1 = internal constant [4 x i8] c"%d\0A\00"		; <[4 x i8]*> [#uses=1]
+
+; Verify printf with no floating point arguments is transformed to iprintf
+define i32 @f0(i32 %x) nounwind {
+entry:
+; CHECK: define i32 @f0
+; CHECK: @iprintf
+; CHECK: }
+	%0 = tail call i32 (i8*, ...)* @printf(i8* getelementptr ([4 x i8]* @.str1, i32 0, i32 0), i32 %x)		; <i32> [#uses=0]
+	ret i32 %0
+}
+
+; Verify we don't turn this into an iprintf call
+define void @f1(double %x) nounwind {
+entry:
+; CHECK: define void @f1
+; CHECK: @printf
+; CHECK: }
+	%0 = tail call i32 (i8*, ...)* @printf(i8* getelementptr ([4 x i8]* @.str, i32 0, i32 0), double %x) nounwind		; <i32> [#uses=0]
+	ret void
+}
+
+declare i32 @printf(i8* nocapture, ...) nounwind