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reg-stack fix
- To: gcc-patches at gcc dot gnu dot org, rth at cygnus dot com
- Subject: reg-stack fix
- From: Jan Hubicka <jh at suse dot cz>
- Date: Thu, 3 Aug 2000 16:13:20 +0200
Hi
The reg-stack is creating improper insns like:
(plus:DF (float_extend:DF (reg:DF))
(reg:SF))
by swapping the registers. This patch fixes this by swapping the regnos only.
This isn't particulary clean, since it makes since register to be accessed
as SF and then DF, but resulting insn chain is correct and similar cases
happends after eliminating of SUBREGs too, so I don't think someone
post-reload should complain about it.
Honza
Thu Aug 3 16:10:37 MET DST 2000 Jan Hubicka <jh@suse.cz>
* reg-stack.c (subst_stack_regs_pat): Use replace_reg to swap
operands.
*** reg-stack.c.old Mon Jul 10 15:51:42 2000
--- reg-stack.c Thu Aug 3 10:51:06 2000
*************** subst_stack_regs_pat (insn, regstack, pa
*** 1638,1646 ****
&& REG_P (*src1) && REG_P (*src2)
&& REGNO (*src1) != REGNO (*dest))
{
! rtx tmp = *src1;
! *src1 = *src2;
! *src2 = tmp;
}
break;
--- 1638,1646 ----
&& REG_P (*src1) && REG_P (*src2)
&& REGNO (*src1) != REGNO (*dest))
{
! int tmp = REGNO (*src1);
! replace_reg (src1, REGNO (*src2));
! replace_reg (src2, tmp);
}
break;