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The test for the PR contains asm insn requiring 7 general regs but
three operands can be in memory too ('g' constraint). There are only
6 available general regs. IRA in the test case assigns a mask reg to
one pseudo. When LRA reloads the pseudo assigned to mask reg, it
frees general reg assigned to another pseudo in the asm and assigns
mask reg to another pseudo. After a few iterations, we have asm all
operands of which are reload pseudos assigned to general regs and one
pseudo assigned to mask reg. After that LRA can do nothing and
reports "not enough regs". The patch recognizes situation when there
are not enough regs for an asm insn and makes 2nd attempt to find
reloads when memory for operands with 'g' or 'rm' constraint is
preferred.
gcc/ChangeLog:
PR target/121571
* lra-constraints.cc (process_alt_operands): Reprocess asm insn
when there are no enough regs for the asm-insn.
gcc/testsuite/ChangeLog:
PR target/121571
* gcc.target/i386/pr121571.c: New.
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