198 lines
6.4 KiB
LLVM
198 lines
6.4 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
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; Test that the wcslen library call simplifier works correctly.
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;
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; RUN: opt < %s -instcombine -S | FileCheck %s
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target datalayout = "e-m:o-i64:64-f80:128-n8:16:32:64-S128"
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; Test behavior for wchar_size==2
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!llvm.module.flags = !{!0}
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!0 = !{i32 1, !"wchar_size", i32 2}
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declare i64 @wcslen(i16*)
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@hello = constant [6 x i16] [i16 104, i16 101, i16 108, i16 108, i16 111, i16 0]
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@longer = constant [7 x i16] [i16 108, i16 111, i16 110, i16 103, i16 101, i16 114, i16 0]
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@null = constant [1 x i16] zeroinitializer
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@null_hello = constant [7 x i16] [i16 0, i16 104, i16 101, i16 108, i16 108, i16 111, i16 0]
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@nullstring = constant i16 0
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@a = common global [32 x i16] zeroinitializer, align 1
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@null_hello_mid = constant [13 x i16] [i16 104, i16 101, i16 108, i16 108, i16 111, i16 32, i16 119, i16 111, i16 114, i16 0, i16 108, i16 100, i16 0]
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define i64 @test_simplify1() {
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; CHECK-LABEL: @test_simplify1(
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; CHECK-NEXT: ret i64 5
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;
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%hello_p = getelementptr [6 x i16], [6 x i16]* @hello, i64 0, i64 0
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%hello_l = call i64 @wcslen(i16* %hello_p)
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ret i64 %hello_l
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}
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define i64 @test_simplify2() {
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; CHECK-LABEL: @test_simplify2(
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; CHECK-NEXT: ret i64 0
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;
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%null_p = getelementptr [1 x i16], [1 x i16]* @null, i64 0, i64 0
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%null_l = call i64 @wcslen(i16* %null_p)
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ret i64 %null_l
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}
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define i64 @test_simplify3() {
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; CHECK-LABEL: @test_simplify3(
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; CHECK-NEXT: ret i64 0
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;
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%null_hello_p = getelementptr [7 x i16], [7 x i16]* @null_hello, i64 0, i64 0
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%null_hello_l = call i64 @wcslen(i16* %null_hello_p)
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ret i64 %null_hello_l
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}
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define i64 @test_simplify4() {
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; CHECK-LABEL: @test_simplify4(
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; CHECK-NEXT: ret i64 0
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;
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%len = tail call i64 @wcslen(i16* @nullstring) nounwind
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ret i64 %len
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}
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; Check wcslen(x) == 0 --> *x == 0.
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define i1 @test_simplify5() {
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; CHECK-LABEL: @test_simplify5(
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; CHECK-NEXT: ret i1 false
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;
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%hello_p = getelementptr [6 x i16], [6 x i16]* @hello, i64 0, i64 0
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%hello_l = call i64 @wcslen(i16* %hello_p)
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%eq_hello = icmp eq i64 %hello_l, 0
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ret i1 %eq_hello
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}
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define i1 @test_simplify6(i16* %str_p) {
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; CHECK-LABEL: @test_simplify6(
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; CHECK-NEXT: [[STRLENFIRST:%.*]] = load i16, i16* [[STR_P:%.*]], align 2
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; CHECK-NEXT: [[EQ_NULL:%.*]] = icmp eq i16 [[STRLENFIRST]], 0
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; CHECK-NEXT: ret i1 [[EQ_NULL]]
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;
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%str_l = call i64 @wcslen(i16* %str_p)
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%eq_null = icmp eq i64 %str_l, 0
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ret i1 %eq_null
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}
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; Check wcslen(x) != 0 --> *x != 0.
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define i1 @test_simplify7() {
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; CHECK-LABEL: @test_simplify7(
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; CHECK-NEXT: ret i1 true
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;
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%hello_p = getelementptr [6 x i16], [6 x i16]* @hello, i64 0, i64 0
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%hello_l = call i64 @wcslen(i16* %hello_p)
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%ne_hello = icmp ne i64 %hello_l, 0
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ret i1 %ne_hello
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}
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define i1 @test_simplify8(i16* %str_p) {
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; CHECK-LABEL: @test_simplify8(
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; CHECK-NEXT: [[STRLENFIRST:%.*]] = load i16, i16* [[STR_P:%.*]], align 2
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; CHECK-NEXT: [[NE_NULL:%.*]] = icmp ne i16 [[STRLENFIRST]], 0
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; CHECK-NEXT: ret i1 [[NE_NULL]]
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;
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%str_l = call i64 @wcslen(i16* %str_p)
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%ne_null = icmp ne i64 %str_l, 0
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ret i1 %ne_null
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}
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define i64 @test_simplify9(i1 %x) {
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; CHECK-LABEL: @test_simplify9(
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; CHECK-NEXT: [[TMP1:%.*]] = select i1 [[X:%.*]], i64 5, i64 6
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; CHECK-NEXT: ret i64 [[TMP1]]
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;
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%hello = getelementptr [6 x i16], [6 x i16]* @hello, i64 0, i64 0
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%longer = getelementptr [7 x i16], [7 x i16]* @longer, i64 0, i64 0
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%s = select i1 %x, i16* %hello, i16* %longer
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%l = call i64 @wcslen(i16* %s)
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ret i64 %l
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}
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; Check the case that should be simplified to a sub instruction.
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; wcslen(@hello + x) --> 5 - x
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define i64 @test_simplify10(i16 %x) {
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; CHECK-LABEL: @test_simplify10(
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; CHECK-NEXT: [[TMP1:%.*]] = sext i16 [[X:%.*]] to i64
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; CHECK-NEXT: [[TMP2:%.*]] = sub nsw i64 5, [[TMP1]]
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; CHECK-NEXT: ret i64 [[TMP2]]
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;
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%hello_p = getelementptr inbounds [6 x i16], [6 x i16]* @hello, i16 0, i16 %x
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%hello_l = call i64 @wcslen(i16* %hello_p)
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ret i64 %hello_l
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}
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; wcslen(@null_hello_mid + (x & 7)) --> 9 - (x & 7)
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define i64 @test_simplify11(i16 %x) {
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; CHECK-LABEL: @test_simplify11(
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; CHECK-NEXT: [[AND:%.*]] = and i16 [[X:%.*]], 7
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; CHECK-NEXT: [[NARROW:%.*]] = sub nuw nsw i16 9, [[AND]]
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; CHECK-NEXT: [[TMP1:%.*]] = zext i16 [[NARROW]] to i64
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; CHECK-NEXT: ret i64 [[TMP1]]
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;
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%and = and i16 %x, 7
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%hello_p = getelementptr inbounds [13 x i16], [13 x i16]* @null_hello_mid, i16 0, i16 %and
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%hello_l = call i64 @wcslen(i16* %hello_p)
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ret i64 %hello_l
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}
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; Check cases that shouldn't be simplified.
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define i64 @test_no_simplify1() {
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; CHECK-LABEL: @test_no_simplify1(
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; CHECK-NEXT: [[A_L:%.*]] = call i64 @wcslen(i16* getelementptr inbounds ([32 x i16], [32 x i16]* @a, i64 0, i64 0))
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; CHECK-NEXT: ret i64 [[A_L]]
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;
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%a_p = getelementptr [32 x i16], [32 x i16]* @a, i64 0, i64 0
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%a_l = call i64 @wcslen(i16* %a_p)
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ret i64 %a_l
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}
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; wcslen(@null_hello + x) should not be simplified to a sub instruction.
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define i64 @test_no_simplify2(i16 %x) {
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; CHECK-LABEL: @test_no_simplify2(
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; CHECK-NEXT: [[TMP1:%.*]] = sext i16 [[X:%.*]] to i64
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; CHECK-NEXT: [[HELLO_P:%.*]] = getelementptr inbounds [7 x i16], [7 x i16]* @null_hello, i64 0, i64 [[TMP1]]
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; CHECK-NEXT: [[HELLO_L:%.*]] = call i64 @wcslen(i16* nonnull [[HELLO_P]])
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; CHECK-NEXT: ret i64 [[HELLO_L]]
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;
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%hello_p = getelementptr inbounds [7 x i16], [7 x i16]* @null_hello, i16 0, i16 %x
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%hello_l = call i64 @wcslen(i16* %hello_p)
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ret i64 %hello_l
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}
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; wcslen(@null_hello_mid + (x & 15)) should not be simplified to a sub instruction.
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define i64 @test_no_simplify3(i16 %x) {
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; CHECK-LABEL: @test_no_simplify3(
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; CHECK-NEXT: [[AND:%.*]] = and i16 [[X:%.*]], 15
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; CHECK-NEXT: [[TMP1:%.*]] = zext i16 [[AND]] to i64
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; CHECK-NEXT: [[HELLO_P:%.*]] = getelementptr inbounds [13 x i16], [13 x i16]* @null_hello_mid, i64 0, i64 [[TMP1]]
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; CHECK-NEXT: [[HELLO_L:%.*]] = call i64 @wcslen(i16* nonnull [[HELLO_P]])
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; CHECK-NEXT: ret i64 [[HELLO_L]]
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;
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%and = and i16 %x, 15
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%hello_p = getelementptr inbounds [13 x i16], [13 x i16]* @null_hello_mid, i16 0, i16 %and
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%hello_l = call i64 @wcslen(i16* %hello_p)
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ret i64 %hello_l
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}
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@str32 = constant [1 x i32] [i32 0]
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; This could in principle be simplified, but the current implementation bails on
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; type mismatches.
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define i64 @test_no_simplify4() {
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; CHECK-LABEL: @test_no_simplify4(
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; CHECK-NEXT: [[L:%.*]] = call i64 @wcslen(i16* bitcast ([1 x i32]* @str32 to i16*))
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; CHECK-NEXT: ret i64 [[L]]
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;
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%l = call i64 @wcslen(i16* bitcast ([1 x i32]* @str32 to i16*))
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ret i64 %l
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}
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