mirror of
https://github.com/c64scene-ar/llvm-6502.git
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0c41d57b09
This patch migrates the strcpy optimizations from the simplify-libcalls pass into the instcombine library call simplifier. Note also that StrCpyChkOpt has been updated with a few simplifications that were being done in the simplify-libcalls version of StrCpyOpt, but not in the migrated implementation of StrCpyOpt. There is no reason to overload StrCpyOpt with fortified and regular simplifications in the new model since there is already a dedicated simplifier for __strcpy_chk. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@166198 91177308-0d34-0410-b5e6-96231b3b80d8
95 lines
2.9 KiB
LLVM
95 lines
2.9 KiB
LLVM
; Test lib call simplification of __strcpy_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* @__strcpy_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* @__strcpy_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* @__strcpy_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* @strcpy
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call i8* @__strcpy_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 void @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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call i8* @__strcpy_chk(i8* %dst, i8* %src, i32 %len)
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ret void
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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: getelementptr inbounds ([60 x i8]* @a, i32 0, i32 0)
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%len = call i32 @llvm.objectsize.i32(i8* %dst, i1 false)
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%ret = call i8* @__strcpy_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* @__strcpy_chk
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call i8* @__strcpy_chk(i8* %dst, i8* %src, i32 8)
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ret void
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}
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declare i8* @__strcpy_chk(i8*, i8*, i32) nounwind
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declare i32 @llvm.objectsize.i32(i8*, i1) nounwind readonly
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