optimizations are deleting my adds

optimizations are deleting my adds

[miloutch]

Hi, 

I have a small problem. I am making a new pass for my gcc, and some of my
adds are deleted by optimization passes.
here is the code i add :

t = builtin_decl_explicit (BUILT_IN_ACC_SETUPARGUMENT);
g = gimple_build_call(t,
			3,
			build1(ADDR_EXPR, integer_ptr_type_node, length),
			build_int_cst(integer_type_node,TREE_INT_CST_LOW(TYPE_SIZE_UNIT
(TREE_TYPE (tmp_result)))),
			offset
			 );
gsi_insert_before (&gsi, g, GSI_SAME_STMT);

you see, the variable length wich is actually "length.0" ->
gimple_omp_for_final() is renamed by ssa pass in length_1(D)
But, here is an ADDR_EXPR of length, and the optimization don't rename it,
so it points to the wrong variable because length.0 is not used anymore
after the optimizations.

I want to know if there is a way to prevent the compiler from optimizing
this code with a flag in my code for example ?
Thanks in advance !
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Re: [BUG middle-end] Optimizations are deleting my adds

[miloutch]

Nobody have the answer ?
I'm desperate ... :(

miloutch wrote:
> 
> Hi, 
> 
> I have a small problem. I am making a new pass for my gcc, and some of my
> adds are deleted by optimization passes.
> here is the code i add :
> 
> t = builtin_decl_explicit (BUILT_IN_ACC_SETUPARGUMENT);
> g = gimple_build_call(t,
> 			3,
> 			build1(ADDR_EXPR, integer_ptr_type_node, length),
> 			build_int_cst(integer_type_node,TREE_INT_CST_LOW(TYPE_SIZE_UNIT
> (TREE_TYPE (tmp_result)))),
> 			offset
> 			 );
> gsi_insert_before (&gsi, g, GSI_SAME_STMT);
> 
> you see, the variable length wich is actually "length.0" ->
> gimple_omp_for_final() is renamed by ssa pass in length_1(D)
> But, here is an ADDR_EXPR of length, and the optimization don't rename it,
> so it points to the wrong variable because length.0 is not used anymore
> after the optimizations.
> 
> I want to know if there is a way to prevent the compiler from optimizing
> this code with a flag in my code for example ?
> Thanks in advance !
> 

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