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e6d781fd3c
This patch migrates the stpcpy optimizations from the simplify-libcalls pass into the instcombine library call simplifier. Note that the __stpcpy_chk simplifications were migrated in a previous commit. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@167083 91177308-0d34-0410-b5e6-96231b3b80d8
97 lines
3.0 KiB
LLVM
97 lines
3.0 KiB
LLVM
; Test lib call simplification of __stpcpy_chk calls with various values
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; for src, dst, and slen.
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;
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; RUN: opt < %s -instcombine -S | FileCheck %s
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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"
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@a = common global [60 x i8] zeroinitializer, align 1
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@b = common global [60 x i8] zeroinitializer, align 1
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@.str = private constant [12 x i8] c"abcdefghijk\00"
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; Check cases where slen >= strlen (src).
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define void @test_simplify1() {
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; CHECK: @test_simplify1
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%dst = getelementptr inbounds [60 x i8]* @a, i32 0, i32 0
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%src = getelementptr inbounds [12 x i8]* @.str, i32 0, i32 0
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; CHECK-NEXT: call void @llvm.memcpy.p0i8.p0i8.i32
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call i8* @__stpcpy_chk(i8* %dst, i8* %src, i32 60)
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ret void
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}
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define void @test_simplify2() {
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; CHECK: @test_simplify2
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%dst = getelementptr inbounds [60 x i8]* @a, i32 0, i32 0
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%src = getelementptr inbounds [12 x i8]* @.str, i32 0, i32 0
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; CHECK-NEXT: call void @llvm.memcpy.p0i8.p0i8.i32
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call i8* @__stpcpy_chk(i8* %dst, i8* %src, i32 12)
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ret void
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}
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define void @test_simplify3() {
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; CHECK: @test_simplify3
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%dst = getelementptr inbounds [60 x i8]* @a, i32 0, i32 0
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%src = getelementptr inbounds [12 x i8]* @.str, i32 0, i32 0
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; CHECK-NEXT: call void @llvm.memcpy.p0i8.p0i8.i32
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call i8* @__stpcpy_chk(i8* %dst, i8* %src, i32 -1)
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ret void
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}
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; Check cases where there are no string constants.
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define void @test_simplify4() {
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; CHECK: @test_simplify4
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%dst = getelementptr inbounds [60 x i8]* @a, i32 0, i32 0
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%src = getelementptr inbounds [60 x i8]* @b, i32 0, i32 0
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; CHECK-NEXT: call i8* @stpcpy
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call i8* @__stpcpy_chk(i8* %dst, i8* %src, i32 -1)
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ret void
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}
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; Check case where the string length is not constant.
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define i8* @test_simplify5() {
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; CHECK: @test_simplify5
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%dst = getelementptr inbounds [60 x i8]* @a, i32 0, i32 0
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%src = getelementptr inbounds [12 x i8]* @.str, i32 0, i32 0
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; CHECK: @__memcpy_chk
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%len = call i32 @llvm.objectsize.i32(i8* %dst, i1 false)
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%ret = call i8* @__stpcpy_chk(i8* %dst, i8* %src, i32 %len)
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; CHECK: ret i8* getelementptr inbounds ([60 x i8]* @a, i32 0, i32 11)
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ret i8* %ret
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}
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; Check case where the source and destination are the same.
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define i8* @test_simplify6() {
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; CHECK: @test_simplify6
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%dst = getelementptr inbounds [60 x i8]* @a, i32 0, i32 0
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; CHECK: [[LEN:%[a-z]+]] = call i32 @strlen
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; CHECK-NEXT: getelementptr inbounds [60 x i8]* @a, i32 0, i32 [[LEN]]
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%len = call i32 @llvm.objectsize.i32(i8* %dst, i1 false)
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%ret = call i8* @__stpcpy_chk(i8* %dst, i8* %dst, i32 %len)
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ret i8* %ret
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}
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; Check case where slen < strlen (src).
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define void @test_no_simplify1() {
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; CHECK: @test_no_simplify1
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%dst = getelementptr inbounds [60 x i8]* @a, i32 0, i32 0
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%src = getelementptr inbounds [60 x i8]* @b, i32 0, i32 0
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; CHECK-NEXT: call i8* @__stpcpy_chk
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call i8* @__stpcpy_chk(i8* %dst, i8* %src, i32 8)
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ret void
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}
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declare i8* @__stpcpy_chk(i8*, i8*, i32) nounwind
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declare i32 @llvm.objectsize.i32(i8*, i1) nounwind readonly
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