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Safely turn memset_chk etc. to non-chk variant if the known object size is >= memset / memcpy / memmove size.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@97828 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Evan Cheng
2010-03-05 20:59:47 +00:00
parent a862326bc7
commit a79eb387ac
2 changed files with 37 additions and 13 deletions
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test/Transforms/SimplifyLibCalls/memset_chk.ll
+18
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@@ -0,0 +1,18 @@
; RUN: opt < %s -simplify-libcalls -S | FileCheck %s
; rdar://7719085
target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128-n8:16:32:64"
%struct.data = type { [100 x i32], [100 x i32], [1024 x i8] }
define i32 @t() nounwind ssp {
; CHECK: @t
; CHECK: @llvm.memset.i64
entry:
%0 = alloca %struct.data, align 8 ; <%struct.data*> [#uses=1]
%1 = bitcast %struct.data* %0 to i8* ; <i8*> [#uses=1]
%2 = call i8* @__memset_chk(i8* %1, i32 0, i64 1824, i64 1824) nounwind ; <i8*> [#uses=0]
ret i32 0
}
declare i8* @__memset_chk(i8*, i32, i64, i64) nounwind