instcombine: Add more test cases for __strcpy_chk simplification

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@164799 91177308-0d34-0410-b5e6-96231b3b80d8

3 files changed, 109 insertions, 13 deletions

diff --git a/test/Transforms/InstCombine/strcpy_chk-1.ll b/test/Transforms/InstCombine/strcpy_chk-1.ll
new file mode 100644
index 0000000..c03e8a3
--- /dev/null
+++ b/test/Transforms/InstCombine/strcpy_chk-1.ll
@@ -0,0 +1,88 @@
+; Test lib call simplification of __strcpy_chk calls with various values
+; for src, dst, and slen.
+;
+; 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"
+
+@a = common global [60 x i8] zeroinitializer, align 1
+@b = common global [60 x i8] zeroinitializer, align 1
+@.str = private constant [8 x i8] c"abcdefg\00"
+
+; Check cases where slen >= strlen (src).
+
+define void @test_simplify1() {
+; CHECK: @test_simplify1
+  %dst = getelementptr inbounds [60 x i8]* @a, i32 0, i32 0
+  %src = getelementptr inbounds [8 x i8]* @.str, i32 0, i32 0
+
+; CHECK-NEXT: call i8* @strcpy
+  call i8* @__strcpy_chk(i8* %dst, i8* %src, i32 60)
+  ret void
+}
+
+define void @test_simplify2() {
+; CHECK: @test_simplify2
+  %dst = getelementptr inbounds [60 x i8]* @a, i32 0, i32 0
+  %src = getelementptr inbounds [8 x i8]* @.str, i32 0, i32 0
+
+; CHECK-NEXT: call i8* @strcpy
+  call i8* @__strcpy_chk(i8* %dst, i8* %src, i32 8)
+  ret void
+}
+
+define void @test_simplify3() {
+; CHECK: @test_simplify3
+  %dst = getelementptr inbounds [60 x i8]* @a, i32 0, i32 0
+  %src = getelementptr inbounds [8 x i8]* @.str, i32 0, i32 0
+
+; CHECK-NEXT: call i8* @strcpy
+  call i8* @__strcpy_chk(i8* %dst, i8* %src, i32 -1)
+  ret void
+}
+
+; Check cases where there are no string constants.
+
+define void @test_simplify4() {
+; CHECK: @test_simplify4
+  %dst = getelementptr inbounds [60 x i8]* @a, i32 0, i32 0
+  %src = getelementptr inbounds [60 x i8]* @b, i32 0, i32 0
+
+; CHECK-NEXT: call i8* @strcpy
+  call i8* @__strcpy_chk(i8* %dst, i8* %src, i32 -1)
+  ret void
+}
+
+define void @test_no_simplify1() {
+; CHECK: @test_no_simplify1
+  %dst = getelementptr inbounds [60 x i8]* @a, i32 0, i32 0
+  %src = getelementptr inbounds [60 x i8]* @b, i32 0, i32 0
+
+; CHECK-NEXT: call i8* @__strcpy_chk
+  call i8* @__strcpy_chk(i8* %dst, i8* %src, i32 8)
+  ret void
+}
+
+; Check case were slen < strlen (src).
+
+define void @test_no_simplify2() {
+; CHECK: @test_no_simplify2
+  %dst = getelementptr inbounds [60 x i8]* @a, i32 0, i32 0
+  %src = getelementptr inbounds [8 x i8]* @.str, i32 0, i32 0
+
+; CHECK-NEXT: call i8* @__strcpy_chk
+  call i8* @__strcpy_chk(i8* %dst, i8* %src, i32 3)
+  ret void
+}
+
+define void @test_no_simplify3() {
+; CHECK: @test_no_simplify3
+  %dst = getelementptr inbounds [60 x i8]* @a, i32 0, i32 0
+  %src = getelementptr inbounds [8 x i8]* @.str, i32 0, i32 0
+
+; CHECK-NEXT: call i8* @__strcpy_chk
+  call i8* @__strcpy_chk(i8* %dst, i8* %src, i32 0)
+  ret void
+}
+
+declare i8* @__strcpy_chk(i8*, i8*, i32) nounwind
diff --git a/test/Transforms/InstCombine/strcpy_chk-2.ll b/test/Transforms/InstCombine/strcpy_chk-2.ll
new file mode 100644
index 0000000..d76ea5d
--- /dev/null
+++ b/test/Transforms/InstCombine/strcpy_chk-2.ll
@@ -0,0 +1,21 @@
+; Test that lib call simplification doesn't simplify __strcpy_chk calls
+; with the wrong prototype.
+;
+; 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"
+
+@a = common global [60 x i16] zeroinitializer, align 1
+@.str = private constant [8 x i8] c"abcdefg\00"
+
+define void @test_no_simplify() {
+; CHECK: @test_no_simplify
+  %dst = getelementptr inbounds [60 x i16]* @a, i32 0, i32 0
+  %src = getelementptr inbounds [8 x i8]* @.str, i32 0, i32 0
+
+; CHECK-NEXT: call i16* @__strcpy_chk
+  call i16* @__strcpy_chk(i16* %dst, i8* %src, i32 8)
+  ret void
+}
+
+declare i16* @__strcpy_chk(i16*, i8*, i32)
diff --git a/test/Transforms/InstCombine/strcpy_chk.ll b/test/Transforms/InstCombine/strcpy_chk.ll
deleted file mode 100644
index 8835a0b..0000000
--- a/test/Transforms/InstCombine/strcpy_chk.ll
+++ /dev/null
@@ -1,13 +0,0 @@
-; 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"
-@a = common global [60 x i8] zeroinitializer, align 1 ; <[60 x i8]*> [#uses=1]
-@.str = private constant [8 x i8] c"abcdefg\00"   ; <[8 x i8]*> [#uses=1]
-
-define i8* @foo() nounwind {
-; CHECK: @foo
-; CHECK-NEXT: call i8* @strcpy
-  %call = call i8* @__strcpy_chk(i8* getelementptr inbounds ([60 x i8]* @a, i32 0, i32 0), i8* getelementptr inbounds ([8 x i8]* @.str, i32 0, i32 0), i32 60) ; <i8*> [#uses=1]
-  ret i8* %call
-}
-
-declare i8* @__strcpy_chk(i8*, i8*, i32) nounwind