test/Transforms/InstCombine/printf-1.ll

; Test that the printf library call simplifier works correctly.
;
; RUN: opt < %s -instcombine -S | FileCheck %s
; RUN: opt < %s -mtriple xcore-xmos-elf -instcombine -S | FileCheck %s -check-prefix=CHECK-IPRINTF

target datalayout = "e-p:32:32:32-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:32:64-f32:32:32-f64:32:64-v64:64:64-v128:128:128-a0:0:64-f80:128:128"

@hello_world = constant [13 x i8] c"hello world\0A\00"
@h = constant [2 x i8] c"h\00"
@h2 = constant [3 x i8] c"%%\00"
@percent = constant [2 x i8] c"%\00"
@percent_c = constant [3 x i8] c"%c\00"
@percent_d = constant [3 x i8] c"%d\00"
@percent_f = constant [3 x i8] c"%f\00"
@percent_s = constant [4 x i8] c"%s\0A\00"
@empty = constant [1 x i8] c"\00"
; CHECK: [[$STR:@[a-z0-9]+]] = private unnamed_addr constant [12 x i8] c"hello world\00", align 1

declare i32 @printf(i8*, ...)

; Check printf("") -> noop.

define void @test_simplify1() {
; CHECK-LABEL: @test_simplify1(
  %fmt = getelementptr [1 x i8], [1 x i8]* @empty, i32 0, i32 0
  call i32 (i8*, ...) @printf(i8* %fmt)
  ret void
; CHECK-NEXT: ret void
}

; Check printf("x") -> putchar('x'), even for '%'.

define void @test_simplify2() {
; CHECK-LABEL: @test_simplify2(
  %fmt = getelementptr [2 x i8], [2 x i8]* @h, i32 0, i32 0
  call i32 (i8*, ...) @printf(i8* %fmt)
; CHECK-NEXT: call i32 @putchar(i32 104)
  ret void
; CHECK-NEXT: ret void
}

; Special case: printf("%%") -> putchar('%').

define void @test_simplify2b() {
; CHECK-LABEL: @test_simplify2b(
  %fmt = getelementptr [3 x i8], [3 x i8]* @h2, i32 0, i32 0
  call i32 (i8*, ...) @printf(i8* %fmt)
; CHECK-NEXT: call i32 @putchar(i32 37)
  ret void
; CHECK-NEXT: ret void
}

define void @test_simplify3() {
; CHECK-LABEL: @test_simplify3(
  %fmt = getelementptr [2 x i8], [2 x i8]* @percent, i32 0, i32 0
  call i32 (i8*, ...) @printf(i8* %fmt)
; CHECK-NEXT: call i32 @putchar(i32 37)
  ret void
; CHECK-NEXT: ret void
}

; Check printf("foo\n") -> puts("foo").

define void @test_simplify4() {
; CHECK-LABEL: @test_simplify4(
  %fmt = getelementptr [13 x i8], [13 x i8]* @hello_world, i32 0, i32 0
  call i32 (i8*, ...) @printf(i8* %fmt)
; CHECK-NEXT: call i32 @puts(i8* getelementptr inbounds ([12 x i8], [12 x i8]* [[$STR]], i32 0, i32 0))
  ret void
; CHECK-NEXT: ret void
}

; Check printf("%c", chr) -> putchar(chr).

define void @test_simplify5() {
; CHECK-LABEL: @test_simplify5(
  %fmt = getelementptr [3 x i8], [3 x i8]* @percent_c, i32 0, i32 0
  call i32 (i8*, ...) @printf(i8* %fmt, i8 104)
; CHECK-NEXT: call i32 @putchar(i32 104)
  ret void
; CHECK-NEXT: ret void
}

; Check printf("%s\n", str) -> puts(str).

define void @test_simplify6() {
; CHECK-LABEL: @test_simplify6(
  %fmt = getelementptr [4 x i8], [4 x i8]* @percent_s, i32 0, i32 0
  %str = getelementptr [13 x i8], [13 x i8]* @hello_world, i32 0, i32 0
  call i32 (i8*, ...) @printf(i8* %fmt, i8* %str)
; CHECK-NEXT: call i32 @puts(i8* getelementptr inbounds ([13 x i8], [13 x i8]* @hello_world, i32 0, i32 0))
  ret void
; CHECK-NEXT: ret void
}

; Check printf(format, ...) -> iprintf(format, ...) if no floating point.

define void @test_simplify7() {
; CHECK-IPRINTF-LABEL: @test_simplify7(
  %fmt = getelementptr [3 x i8], [3 x i8]* @percent_d, i32 0, i32 0
  call i32 (i8*, ...) @printf(i8* %fmt, i32 187)
; CHECK-IPRINTF-NEXT: call i32 (i8*, ...) @iprintf(i8* getelementptr inbounds ([3 x i8], [3 x i8]* @percent_d, i32 0, i32 0), i32 187)
  ret void
; CHECK-IPRINTF-NEXT: ret void
}

define void @test_no_simplify1() {
; CHECK-IPRINTF-LABEL: @test_no_simplify1(
  %fmt = getelementptr [3 x i8], [3 x i8]* @percent_f, i32 0, i32 0
  call i32 (i8*, ...) @printf(i8* %fmt, double 1.87)
; CHECK-IPRINTF-NEXT: call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([3 x i8], [3 x i8]* @percent_f, i32 0, i32 0), double 1.870000e+00)
  ret void
; CHECK-IPRINTF-NEXT: ret void
}

define void @test_no_simplify2(i8* %fmt, double %d) {
; CHECK-LABEL: @test_no_simplify2(
  call i32 (i8*, ...) @printf(i8* %fmt, double %d)
; CHECK-NEXT: call i32 (i8*, ...) @printf(i8* %fmt, double %d)
  ret void
; CHECK-NEXT: ret void
}

define i32 @test_no_simplify3() {
; CHECK-LABEL: @test_no_simplify3(
  %fmt = getelementptr [2 x i8], [2 x i8]* @h, i32 0, i32 0
  %ret = call i32 (i8*, ...) @printf(i8* %fmt)
; CHECK-NEXT: call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([2 x i8], [2 x i8]* @h, i32 0, i32 0))
  ret i32 %ret
; CHECK-NEXT: ret i32 %ret
}