We are trying to examine all uses of a reg, but overlook those in a
REG_EQUIV note. This is problematic as documented in the PR.
The following patch fixes it according to Pat Haugen. Bootstrapped and
tested on x86_64-linux, ok?
Bernd
* ira.c (find_moveable_pseudos): Skip registers whose
DF_REG_EQ_USE_COUNT is nonzero.
Index: gcc/ira.c
===================================================================
--- gcc/ira.c (revision 186875)
+++ gcc/ira.c (working copy)
@@ -3764,6 +3764,7 @@ find_moveable_pseudos (void)
if (DF_REG_DEF_COUNT (regno) != 1
|| !DF_REF_INSN_INFO (def)
|| HARD_REGISTER_NUM_P (regno)
+ || DF_REG_EQ_USE_COUNT (regno) > 0
|| (!INTEGRAL_MODE_P (mode) && !FLOAT_MODE_P (mode)))
continue;
def_insn = DF_REF_INSN (def);
