[InstCombine][NFC] add tests for printf("%s", str) --> puts(str)/noop transformation.

[yurai007]

Summary

Split off from D100724.

[thakis]

Looks like this breaks tests: http://45.33.8.238/linux/44909/step_12.txt

Please take a look, and if it takes a while to fix please revert for now.

[xbolva00]

In D101149#2711942, @thakis wrote:

Looks like this breaks tests: http://45.33.8.238/linux/44909/step_12.txt

Please take a look, and if it takes a while to fix please revert for now.

Regenerated. SHould be fixed now. @yurai007 you have old version of "opt" on your system. For the next time: Fetch latest sources of LLVM & run ninja -j8 && ninja install. Then you can use update scripts.

[yurai007]

@xbolva00: Ok.

llvm/test/Transforms/InstCombine/printf-2.ll

 ; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --check-globals
 ; Test that the printf library call simplifier works correctly.
 ;
 ; RUN: opt < %s -instcombine -S | FileCheck %s
 
 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"
 @percent_s = constant [4 x i8] c"%s\0A\00"
 @format_str = constant [3 x i8] c"%s\00"
 @charstr = constant [2 x i8] c"a\00"
+@empty = constant [1 x i8] c"\00"
 
 declare void @printf(i8*, ...)
 
 ; Check simplification of printf with void return type.
 
 ;.
 ; CHECK: @[[HELLO_WORLD:[a-zA-Z0-9_$"\\.-]+]] = constant [13 x i8] c"hello world\0A\00"
 ; CHECK: @[[H:[a-zA-Z0-9_$"\\.-]+]] = constant [2 x i8] c"h\00"
 ; CHECK: @[[PERCENT_S:[a-zA-Z0-9_$"\\.-]+]] = constant [4 x i8] c"%s\0A\00"
 ; CHECK: @[[FORMAT_STR:[a-zA-Z0-9_$"\\.-]+]] = constant [3 x i8] c"%s\00"
 ; CHECK: @[[CHARSTR:[a-zA-Z0-9_$"\\.-]+]] = constant [2 x i8] c"a\00"
+; CHECK: @[[EMPTY:[a-zA-Z0-9_$"\\.-]+]] = constant [1 x i8] zeroinitializer
 ; CHECK: @[[STR:[a-zA-Z0-9_$"\\.-]+]] = private unnamed_addr constant [12 x i8] c"hello world\00", align 1
 ;.
 define void @test_simplify1() {
 ; CHECK-LABEL: @test_simplify1(
 ; CHECK-NEXT:    [[PUTCHAR:%.*]] = call i32 @putchar(i32 104)
 ; CHECK-NEXT:    ret void
 ;
   %fmt = getelementptr [2 x i8], [2 x i8]* @h, i32 0, i32 0

 ; CHECK-NEXT:    [[PUTCHAR:%.*]] = call i32 @putchar(i32 97)
 ; CHECK-NEXT:    ret void
 ;
   %fmt = getelementptr [3 x i8], [3 x i8]* @format_str, i32 0, i32 0
   %str = getelementptr [2 x i8], [2 x i8]* @charstr, i32 0, i32 0
   call void (i8*, ...) @printf(i8* %fmt, i8* %str)
   ret void
 }
+
+define void @test_simplify8() {
+; CHECK-LABEL: @test_simplify8(
+; CHECK-NEXT:    call void (i8*, ...) @printf(i8* nonnull dereferenceable(1) getelementptr inbounds ([3 x i8], [3 x i8]* @format_str, i32 0, i32 0), i8* getelementptr inbounds ([1 x i8], [1 x i8]* @empty, i32 0, i32 0))
+; CHECK-NEXT:    ret void
+;
+  %fmt = getelementptr [3 x i8], [3 x i8]* @format_str, i32 0, i32 0
+  %str = getelementptr [1 x i8], [1 x i8]* @empty, i32 0, i32 0
+  call void (i8*, ...) @printf(i8* %fmt, i8* %str)
+  ret void
+}
+
+define void @test_simplify9() {
+; CHECK-LABEL: @test_simplify9(
+; CHECK-NEXT:    call void (i8*, ...) @printf(i8* nonnull dereferenceable(1) getelementptr inbounds ([3 x i8], [3 x i8]* @format_str, i32 0, i32 0), i8* getelementptr inbounds ([13 x i8], [13 x i8]* @hello_world, i32 0, i32 0))
+; CHECK-NEXT:    ret void
+;
+  %fmt = getelementptr [3 x i8], [3 x i8]* @format_str, i32 0, i32 0
+  %str = getelementptr [13 x i8], [13 x i8]* @hello_world, i32 0, i32 0
+  call void (i8*, ...) @printf(i8* %fmt, i8* %str)
+  ret void
+}
+
+define void @test_simplify10() {
+; CHECK-LABEL: @test_simplify10(
+; CHECK-NEXT:    call void (i8*, ...) @printf(i8* nonnull dereferenceable(1) getelementptr inbounds ([3 x i8], [3 x i8]* @format_str, i32 0, i32 0), i8* getelementptr inbounds ([1 x i8], [1 x i8]* @empty, i32 0, i32 0), i32 42, double 0x40091EB860000000)
+; CHECK-NEXT:    [[PUTCHAR:%.*]] = call i32 @putchar(i32 97)
+; CHECK-NEXT:    call void (i8*, ...) @printf(i8* nonnull dereferenceable(1) getelementptr inbounds ([3 x i8], [3 x i8]* @format_str, i32 0, i32 0), i8* getelementptr inbounds ([13 x i8], [13 x i8]* @hello_world, i32 0, i32 0), i32 42, double 0x40091EB860000000)
+; CHECK-NEXT:    ret void
+;
+  %fmt = getelementptr [3 x i8], [3 x i8]* @format_str, i32 0, i32 0
+  %str1 = getelementptr [1 x i8], [1 x i8]* @empty, i32 0, i32 0
+  call void (i8*, ...) @printf(i8* %fmt, i8* %str1, i32 42, double 0x40091EB860000000)
+  %str2 = getelementptr [2 x i8], [2 x i8]* @charstr, i32 0, i32 0
+  call void (i8*, ...) @printf(i8* %fmt, i8* %str2, i32 42, double 0x40091EB860000000)
+  %str3 = getelementptr [13 x i8], [13 x i8]* @hello_world, i32 0, i32 0
+  call void (i8*, ...) @printf(i8* %fmt, i8* %str3, i32 42, double 0x40091EB860000000)
+  ret void
+}
 ;.
 ; CHECK: attributes #[[ATTR0:[0-9]+]] = { nofree nounwind }
 ;.