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simplify-libcalls: fold strstr(a, b) == a -> strncmp(a, b, strlen(b)) == 0

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@106047 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Benjamin Kramer
2010-06-15 21:34:25 +00:00
parent 2bbaf4d06e
commit 386e918438
4 changed files with 72 additions and 0 deletions
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test/Transforms/SimplifyLibCalls/StrStr.ll
+12
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@@ -46,3 +46,15 @@ entry:
; CHECK: @test4
; CHECK: ret i8* %P
}
define i1 @test5(i8* %P, i8* %Q) nounwind readonly {
entry:
%call = tail call i8* @strstr(i8* %P, i8* %Q) nounwind ; <i8*> [#uses=1]
%cmp = icmp eq i8* %call, %P
ret i1 %cmp
; CHECK: @test5
; CHECK: [[LEN:%[a-z]+]] = call {{i[0-9]+}} @strlen(i8* %Q)
; CHECK: [[NCMP:%[a-z]+]] = call {{i[0-9]+}} @strncmp(i8* %P, i8* %Q, {{i[0-9]+}} [[LEN]])
; CHECK: icmp eq {{i[0-9]+}} [[NCMP]], 0
; CHECK: ret i1
}