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re PR tree-optimization/79981 (Forwprop not working for __atomic_compare_exchange_n)

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PR tree-optimization/79981
	* tree-vrp.c (extract_range_basic): Handle IMAGPART_EXPR of
	ATOMIC_COMPARE_EXCHANGE ifn result.
	(stmt_interesting_for_vrp, vrp_visit_stmt): Handle
	IFN_ATOMIC_COMPARE_EXCHANGE.

From-SVN: r246054
This commit is contained in:
Jakub Jelinek 2017-03-10 20:47:44 +01:00 committed by Jakub Jelinek
parent 80dd631fce
commit c7aee4a15c
2 changed files with 21 additions and 1 deletions
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8
gcc/ChangeLog
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@ -1,3 +1,11 @@
2017-03-10 Jakub Jelinek <jakub@redhat.com>
PR tree-optimization/79981
* tree-vrp.c (extract_range_basic): Handle IMAGPART_EXPR of
ATOMIC_COMPARE_EXCHANGE ifn result.
(stmt_interesting_for_vrp, vrp_visit_stmt): Handle
IFN_ATOMIC_COMPARE_EXCHANGE.
2017-03-10 David Malcolm <dmalcolm@redhat.com>
PR driver/79875

14
gcc/tree-vrp.c
View File

@ -4107,7 +4107,7 @@ extract_range_basic (value_range *vr, gimple *stmt)
}
/* Handle extraction of the two results (result of arithmetics and
a flag whether arithmetics overflowed) from {ADD,SUB,MUL}_OVERFLOW
internal function. */
internal function. Similarly from ATOMIC_COMPARE_EXCHANGE. */
else if (is_gimple_assign (stmt)
&& (gimple_assign_rhs_code (stmt) == REALPART_EXPR
|| gimple_assign_rhs_code (stmt) == IMAGPART_EXPR)
@ -4132,6 +4132,16 @@ extract_range_basic (value_range *vr, gimple *stmt)
case IFN_MUL_OVERFLOW:
subcode = MULT_EXPR;
break;
case IFN_ATOMIC_COMPARE_EXCHANGE:
if (code == IMAGPART_EXPR)
{
/* This is the boolean return value whether compare and
exchange changed anything or not. */
set_value_range (vr, VR_RANGE, build_int_cst (type, 0),
build_int_cst (type, 1), NULL);
return;
}
break;
default:
break;
}
@ -7283,6 +7293,7 @@ stmt_interesting_for_vrp (gimple *stmt)
case IFN_ADD_OVERFLOW:
case IFN_SUB_OVERFLOW:
case IFN_MUL_OVERFLOW:
case IFN_ATOMIC_COMPARE_EXCHANGE:
/* These internal calls return _Complex integer type,
but are interesting to VRP nevertheless. */
if (lhs && TREE_CODE (lhs) == SSA_NAME)
@ -8308,6 +8319,7 @@ vrp_visit_stmt (gimple *stmt, edge *taken_edge_p, tree *output_p)
case IFN_ADD_OVERFLOW:
case IFN_SUB_OVERFLOW:
case IFN_MUL_OVERFLOW:
case IFN_ATOMIC_COMPARE_EXCHANGE:
/* These internal calls return _Complex integer type,
which VRP does not track, but the immediate uses
thereof might be interesting. */