From 05c912a439cc5ef0f76888e59188582f35fdc0bc Mon Sep 17 00:00:00 2001
From: Dawid Jurczak <dawid_jurek@vp.pl>
Date: Fri, 23 Apr 2021 14:24:19 +0200
Subject: [PATCH] [InstCombine][NFC] add tests for printf("%s", str) -->
 puts(str)/noop transformation.

Split off from D100724.

Reviewed By: xbolva00

Differential Revision: https://reviews.llvm.org/D101149
---
 llvm/test/Transforms/InstCombine/printf-2.ll | 41 ++++++++++++++++++++++++++++
 1 file changed, 41 insertions(+)

diff --git a/llvm/test/Transforms/InstCombine/printf-2.ll b/llvm/test/Transforms/InstCombine/printf-2.ll
index 16caf34..7c9d5bd 100644
--- a/llvm/test/Transforms/InstCombine/printf-2.ll
+++ b/llvm/test/Transforms/InstCombine/printf-2.ll
@@ -10,6 +10,7 @@ target datalayout = "e-p:32:32:32-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:32:64-f3
 @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*, ...)
 
@@ -21,6 +22,7 @@ declare void @printf(i8*, ...)
 ; 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() {
@@ -64,6 +66,45 @@ define void @test_simplify7() {
   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 }
 ;.
-- 
2.7.4