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All of these should turn into sign extends (e.g. extsh/extsb on PPC)

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@23427 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2005-09-24 23:42:18 +00:00
parent a58ef7b652
commit 8a11da021b
1 changed files with 43 additions and 0 deletions
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43
test/Transforms/InstCombine/signext.ll Normal file
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; RUN: llvm-as < %s | opt -instcombine -disable-output &&
; RUN: llvm-as < %s | opt -instcombine | llvm-dis | not grep '(and\|xor\|add\|shl\|shr)'
int %test1(int %x) {
%tmp.1 = and int %x, 65535 ; <int> [#uses=1]
%tmp.2 = xor int %tmp.1, -32768 ; <int> [#uses=1]
%tmp.3 = add int %tmp.2, 32768 ; <int> [#uses=1]
ret int %tmp.3
}
int %test2(int %x) {
%tmp.1 = and int %x, 65535 ; <int> [#uses=1]
%tmp.2 = xor int %tmp.1, 32768 ; <int> [#uses=1]
%tmp.3 = add int %tmp.2, -32768 ; <int> [#uses=1]
ret int %tmp.3
}
int %test3(ushort %P) {
%tmp.1 = cast ushort %P to int ; <int> [#uses=1]
%tmp.4 = xor int %tmp.1, 32768 ; <int> [#uses=1]
%tmp.5 = add int %tmp.4, -32768 ; <int> [#uses=1]
ret int %tmp.5
}
uint %test4(ushort %P) {
%tmp.1 = cast ushort %P to uint ; <uint> [#uses=1]
%tmp.4 = xor uint %tmp.1, 32768 ; <uint> [#uses=1]
%tmp.5 = add uint %tmp.4, 4294934528 ; <uint> [#uses=1]
ret uint %tmp.5
}
int %test5(int %x) {
%tmp.1 = and int %x, 254
%tmp.2 = xor int %tmp.1, 128
%tmp.3 = add int %tmp.2, -128
ret int %tmp.3
}
int %test6(int %x) {
%tmp.2 = shl int %x, ubyte 16 ; <int> [#uses=1]
%tmp.4 = shr int %tmp.2, ubyte 16 ; <int> [#uses=1]
ret int %tmp.4
}