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-rw-r--r--test/Transforms/InstCombine/memchr.ll200
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diff --git a/test/Transforms/InstCombine/memchr.ll b/test/Transforms/InstCombine/memchr.ll
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+++ b/test/Transforms/InstCombine/memchr.ll
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+; 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: store i8* getelementptr inbounds ([14 x i8], [14 x i8]* @hello, i32 0, i32 6)
+; CHECK-NOT: call i8* @memchr
+; CHECK: 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: store i8* null, i8** @chp, align 4
+; CHECK-NOT: call i8* @memchr
+; CHECK: 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: store i8* getelementptr inbounds ([14 x i8], [14 x i8]* @hello, i32 0, i32 13)
+; CHECK-NOT: call i8* @memchr
+; CHECK: 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: call i8* @memchr
+; CHECK-NOT: call i8* @memchr
+; CHECK: 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: store i8* getelementptr inbounds ([14 x i8], [14 x i8]* @hello, i32 0, i32 13)
+; CHECK-NOT: call i8* @memchr
+; CHECK: 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: store i8* getelementptr inbounds ([14 x i8], [14 x i8]* @hello, i32 0, i32 6)
+; CHECK-NOT: call i8* @memchr
+; CHECK: 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: store i8* null, i8** @chp, align 4
+; CHECK-NOT: call i8* @memchr
+; CHECK: 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: store i8* getelementptr inbounds ([14 x i8], [14 x i8]* @hellonull, i32 0, i32 6)
+; CHECK-NOT: call i8* @memchr
+; CHECK: 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: store i8* getelementptr inbounds ([14 x i8], [14 x i8]* @hellonull, i32 0, i32 6)
+; CHECK-NOT: call i8* @memchr
+; CHECK: 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: store i8* null, i8** @chp, align 4
+; CHECK-NOT: call i8* @memchr
+; CHECK: 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: [[TRUNC:%.*]] = trunc i32 %C to i16
+; CHECK-NEXT: %memchr.bounds = icmp ult i16 [[TRUNC]], 16
+; CHECK-NEXT: [[SHL:%.*]] = shl i16 1, [[TRUNC]]
+; CHECK-NEXT: [[AND:%.*]] = and i16 [[SHL]], 9216
+; CHECK-NEXT: %memchr.bits = icmp ne i16 [[AND]], 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: %memchr.bounds = icmp ult i32 %C, 32
+; CHECK-NEXT: [[SHL:%.*]] = shl i32 1, %C
+; CHECK-NEXT: [[AND:%.*]] = and i32 [[SHL]], -2147483647
+; CHECK-NEXT: %memchr.bits = icmp ne i32 [[AND]], 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: icmp eq i32 %C, 31
+; CHECK-NEXT: ret
+
+ %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
+}
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