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2013 Mar 12
0
[LLVMdev] help decompiling x86 ASM to LLVM IR
...ted as a
side effect of instructions and letting a dead-code elimination pass
eliminate extraneous uses. A rough equivalent for llvm IR in this could
would be
%cf = icmp lt i32 1, %edi
%eax2 = sub i32 %eax, %eax
%1 = zext i1 %cf to i32
%eax3 = sub i32 %eax2, %1
%eax4 = and i32 0xffffffdf, %eax3
%eax5 = add i32 0x61, %eax4
> The aim is to be able to then recompile it to maybe a different target.
> The aim is to go from binary -> LLVM IR -> binary for cases where the
> C source code it not available or lost.
I know qemu can use LLVM IR as an intermediate form for optimizing
emula...
2013 Mar 12
6
[LLVMdev] help decompiling x86 ASM to LLVM IR
Hi,
I am looking to decompile x86 ASM to LLVM IR.
The original C is this:
int test61 ( unsigned value ) {
int ret;
if (value < 1)
ret = 0x40;
else
ret = 0x61;
return ret;
}
It compiles with GCC -O2 to (rather cleverly removing any branches):
0000000000000000 <test61>:
0: 83 ff 01 cmp $0x1,%edi
3: