1 files changed, 204 insertions, 0 deletions
diff --git a/llvm/test/Transforms/InstCombine/memchr.ll b/llvm/test/Transforms/InstCombine/memchr.ll
new file mode 100644
index 00000000000..83073e20676
--- /dev/null
+++ b/llvm/test/Transforms/InstCombine/memchr.ll
@@ -0,0 +1,204 @@
+; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
+; Test that the memchr 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-n8:16:32"
+
+@hello = constant [14 x i8] c"hello world\5Cn\00"
+@hellonull = constant [14 x i8] c"hello\00world\5Cn\00"
+@null = constant [1 x i8] zeroinitializer
+@newlines = constant [3 x i8] c"\0D\0A\00"
+@single = constant [2 x i8] c"\1F\00"
+@spaces = constant [4 x i8] c" \0D\0A\00"
+@negative = constant [3 x i8] c"\FF\FE\00"
+@chp = global i8* zeroinitializer
+
+declare i8* @memchr(i8*, i32, i32)
+
+define void @test1() {
+; CHECK-LABEL: @test1(
+; CHECK-NEXT:    store i8* getelementptr inbounds ([14 x i8], [14 x i8]* @hello, i32 0, i32 6), i8** @chp, align 4
+; CHECK-NEXT:    ret void
+;
+  %str = getelementptr [14 x i8], [14 x i8]* @hello, i32 0, i32 0
+  %dst = call i8* @memchr(i8* %str, i32 119, i32 14)
+  store i8* %dst, i8** @chp
+  ret void
+}
+
+define void @test2() {
+; CHECK-LABEL: @test2(
+; CHECK-NEXT:    store i8* null, i8** @chp, align 4
+; CHECK-NEXT:    ret void
+;
+  %str = getelementptr [1 x i8], [1 x i8]* @null, i32 0, i32 0
+  %dst = call i8* @memchr(i8* %str, i32 119, i32 1)
+  store i8* %dst, i8** @chp
+  ret void
+}
+
+define void @test3() {
+; CHECK-LABEL: @test3(
+; CHECK-NEXT:    store i8* getelementptr inbounds ([14 x i8], [14 x i8]* @hello, i32 0, i32 13), i8** @chp, align 4
+; CHECK-NEXT:    ret void
+;
+  %src = getelementptr [14 x i8], [14 x i8]* @hello, i32 0, i32 0
+  %dst = call i8* @memchr(i8* %src, i32 0, i32 14)
+  store i8* %dst, i8** @chp
+  ret void
+}
+
+define void @test4(i32 %chr) {
+; CHECK-LABEL: @test4(
+; CHECK-NEXT:    [[DST:%.*]] = call i8* @memchr(i8* getelementptr inbounds ([14 x i8], [14 x i8]* @hello, i32 0, i32 0), i32 [[CHR:%.*]], i32 14)
+; CHECK-NEXT:    store i8* [[DST]], i8** @chp, align 4
+; CHECK-NEXT:    ret void
+;
+  %src = getelementptr [14 x i8], [14 x i8]* @hello, i32 0, i32 0
+  %dst = call i8* @memchr(i8* %src, i32 %chr, i32 14)
+  store i8* %dst, i8** @chp
+  ret void
+}
+
+define void @test5() {
+; CHECK-LABEL: @test5(
+; CHECK-NEXT:    store i8* getelementptr inbounds ([14 x i8], [14 x i8]* @hello, i32 0, i32 13), i8** @chp, align 4
+; CHECK-NEXT:    ret void
+;
+  %src = getelementptr [14 x i8], [14 x i8]* @hello, i32 0, i32 0
+  %dst = call i8* @memchr(i8* %src, i32 65280, i32 14)
+  store i8* %dst, i8** @chp
+  ret void
+}
+
+define void @test6() {
+; CHECK-LABEL: @test6(
+; CHECK-NEXT:    store i8* getelementptr inbounds ([14 x i8], [14 x i8]* @hello, i32 0, i32 6), i8** @chp, align 4
+; CHECK-NEXT:    ret void
+;
+  %src = getelementptr [14 x i8], [14 x i8]* @hello, i32 0, i32 0
+; Overflow, but we still find the right thing.
+  %dst = call i8* @memchr(i8* %src, i32 119, i32 100)
+  store i8* %dst, i8** @chp
+  ret void
+}
+
+define void @test7() {
+; CHECK-LABEL: @test7(
+; CHECK-NEXT:    store i8* null, i8** @chp, align 4
+; CHECK-NEXT:    ret void
+;
+  %src = getelementptr [14 x i8], [14 x i8]* @hello, i32 0, i32 0
+; Overflow
+  %dst = call i8* @memchr(i8* %src, i32 120, i32 100)
+  store i8* %dst, i8** @chp
+  ret void
+}
+
+define void @test8() {
+; CHECK-LABEL: @test8(
+; CHECK-NEXT:    store i8* getelementptr inbounds ([14 x i8], [14 x i8]* @hellonull, i32 0, i32 6), i8** @chp, align 4
+; CHECK-NEXT:    ret void
+;
+  %str = getelementptr [14 x i8], [14 x i8]* @hellonull, i32 0, i32 0
+  %dst = call i8* @memchr(i8* %str, i32 119, i32 14)
+  store i8* %dst, i8** @chp
+  ret void
+}
+
+define void @test9() {
+; CHECK-LABEL: @test9(
+; CHECK-NEXT:    store i8* getelementptr inbounds ([14 x i8], [14 x i8]* @hellonull, i32 0, i32 6), i8** @chp, align 4
+; CHECK-NEXT:    ret void
+;
+  %str = getelementptr [14 x i8], [14 x i8]* @hellonull, i32 0, i32 2
+  %dst = call i8* @memchr(i8* %str, i32 119, i32 12)
+  store i8* %dst, i8** @chp
+  ret void
+}
+
+define void @test10() {
+; CHECK-LABEL: @test10(
+; CHECK-NEXT:    store i8* null, i8** @chp, align 4
+; CHECK-NEXT:    ret void
+;
+  %str = getelementptr [14 x i8], [14 x i8]* @hello, i32 0, i32 0
+  %dst = call i8* @memchr(i8* %str, i32 119, i32 6)
+  store i8* %dst, i8** @chp
+  ret void
+}
+
+; Check transformation memchr("\r\n", C, 2) != nullptr -> (C & 9216) != 0
+define i1 @test11(i32 %C) {
+; CHECK-LABEL: @test11(
+; CHECK-NEXT:    [[TMP1:%.*]] = trunc i32 [[C:%.*]] to i16
+; CHECK-NEXT:    [[TMP2:%.*]] = and i16 [[TMP1]], 255
+; CHECK-NEXT:    [[MEMCHR_BOUNDS:%.*]] = icmp ult i16 [[TMP2]], 16
+; CHECK-NEXT:    [[TMP3:%.*]] = shl i16 1, [[TMP2]]
+; CHECK-NEXT:    [[TMP4:%.*]] = and i16 [[TMP3]], 9216
+; CHECK-NEXT:    [[MEMCHR_BITS:%.*]] = icmp ne i16 [[TMP4]], 0
+; CHECK-NEXT:    [[MEMCHR:%.*]] = and i1 [[MEMCHR_BOUNDS]], [[MEMCHR_BITS]]
+; CHECK-NEXT:    ret i1 [[MEMCHR]]
+;
+  %dst = call i8* @memchr(i8* getelementptr inbounds ([3 x i8], [3 x i8]* @newlines, i64 0, i64 0), i32 %C, i32 2)
+  %cmp = icmp ne i8* %dst, null
+  ret i1 %cmp
+}
+
+; No 64 bits here
+define i1 @test12(i32 %C) {
+; CHECK-LABEL: @test12(
+; CHECK-NEXT:    [[DST:%.*]] = call i8* @memchr(i8* getelementptr inbounds ([4 x i8], [4 x i8]* @spaces, i32 0, i32 0), i32 [[C:%.*]], i32 3)
+; CHECK-NEXT:    [[CMP:%.*]] = icmp ne i8* [[DST]], null
+; CHECK-NEXT:    ret i1 [[CMP]]
+;
+  %dst = call i8* @memchr(i8* getelementptr inbounds ([4 x i8], [4 x i8]* @spaces, i64 0, i64 0), i32 %C, i32 3)
+  %cmp = icmp ne i8* %dst, null
+  ret i1 %cmp
+}
+
+define i1 @test13(i32 %C) {
+; CHECK-LABEL: @test13(
+; CHECK-NEXT:    [[TMP1:%.*]] = and i32 [[C:%.*]], 255
+; CHECK-NEXT:    [[MEMCHR_BOUNDS:%.*]] = icmp ult i32 [[TMP1]], 32
+; CHECK-NEXT:    [[TMP2:%.*]] = shl i32 1, [[TMP1]]
+; CHECK-NEXT:    [[TMP3:%.*]] = and i32 [[TMP2]], -2147483647
+; CHECK-NEXT:    [[MEMCHR_BITS:%.*]] = icmp ne i32 [[TMP3]], 0
+; CHECK-NEXT:    [[MEMCHR:%.*]] = and i1 [[MEMCHR_BOUNDS]], [[MEMCHR_BITS]]
+; CHECK-NEXT:    ret i1 [[MEMCHR]]
+;
+  %dst = call i8* @memchr(i8* getelementptr inbounds ([2 x i8], [2 x i8]* @single, i64 0, i64 0), i32 %C, i32 2)
+  %cmp = icmp ne i8* %dst, null
+  ret i1 %cmp
+}
+
+define i1 @test14(i32 %C) {
+; CHECK-LABEL: @test14(
+; CHECK-NEXT:    [[TMP1:%.*]] = and i32 [[C:%.*]], 255
+; CHECK-NEXT:    [[MEMCHR_BITS:%.*]] = icmp eq i32 [[TMP1]], 31
+; CHECK-NEXT:    ret i1 [[MEMCHR_BITS]]
+;
+  %dst = call i8* @memchr(i8* getelementptr inbounds ([2 x i8], [2 x i8]* @single, i64 0, i64 0), i32 %C, i32 1)
+  %cmp = icmp ne i8* %dst, null
+  ret i1 %cmp
+}
+
+define i1 @test15(i32 %C) {
+; CHECK-LABEL: @test15(
+; CHECK-NEXT:    [[DST:%.*]] = call i8* @memchr(i8* getelementptr inbounds ([3 x i8], [3 x i8]* @negative, i32 0, i32 0), i32 [[C:%.*]], i32 3)
+; CHECK-NEXT:    [[CMP:%.*]] = icmp ne i8* [[DST]], null
+; CHECK-NEXT:    ret i1 [[CMP]]
+;
+  %dst = call i8* @memchr(i8* getelementptr inbounds ([3 x i8], [3 x i8]* @negative, i64 0, i64 0), i32 %C, i32 3)
+  %cmp = icmp ne i8* %dst, null
+  ret i1 %cmp
+}
+
+@s = internal constant [1 x i8] [i8 0], align 1
+define i8* @pr32124() {
+; CHECK-LABEL: @pr32124(
+; CHECK-NEXT:    ret i8* getelementptr inbounds ([1 x i8], [1 x i8]* @s, i32 0, i32 0)
+;
+  %res = tail call i8* @memchr(i8* getelementptr ([1 x i8], [1 x i8]* @s, i64 0, i64 0), i32 0, i32 1)
+  ret i8* %res
+}