diff options
Diffstat (limited to 'gcc/reload.c')
| -rw-r--r-- | gcc/reload.c | 39 |
1 files changed, 30 insertions, 9 deletions
diff --git a/gcc/reload.c b/gcc/reload.c index 5f27744057d..ffc48a5e58b 100644 --- a/gcc/reload.c +++ b/gcc/reload.c @@ -91,7 +91,6 @@ a register with any other reload. */ #include "rtl.h" #include "tm_p.h" #include "insn-config.h" -#include "insn-codes.h" #include "recog.h" #include "reload.h" #include "regs.h" @@ -2750,7 +2749,7 @@ find_reloads (insn, replace, ind_levels, live_known, reload_reg_p) register char *p = constraints[i]; register int win = 0; int did_match = 0; - /* 0 => this operand can be reloaded somehow for this alternative */ + /* 0 => this operand can be reloaded somehow for this alternative. */ int badop = 1; /* 0 => this operand can be reloaded if the alternative allows regs. */ int winreg = 0; @@ -3143,7 +3142,7 @@ find_reloads (insn, replace, ind_levels, live_known, reload_reg_p) || (REGNO (operand) >= FIRST_PSEUDO_REGISTER && reg_renumber[REGNO (operand)] < 0))) win = 1; - /* Drop through into 'r' case */ + /* Drop through into 'r' case. */ case 'r': this_alternative[i] @@ -3771,7 +3770,11 @@ find_reloads (insn, replace, ind_levels, live_known, reload_reg_p) if (GET_CODE (operand) == REG) { if (modified[i] != RELOAD_WRITE) - emit_insn_before (gen_rtx_USE (VOIDmode, operand), insn); + /* We mark the USE with QImode so that we recognize + it as one that can be safely deleted at the end + of reload. */ + PUT_MODE (emit_insn_before (gen_rtx_USE (VOIDmode, operand), + insn), QImode); if (modified[i] != RELOAD_READ) emit_insn_after (gen_rtx_CLOBBER (VOIDmode, operand), insn); } @@ -4257,7 +4260,11 @@ find_reloads_toplev (x, opnum, type, ind_levels, is_set_dest, insn, this substitution. We have to emit a USE of the pseudo so that delete_output_reload can see it. */ if (replace_reloads && recog_data.operand[opnum] != x) - emit_insn_before (gen_rtx_USE (VOIDmode, x), insn); + /* We mark the USE with QImode so that we recognize it + as one that can be safely deleted at the end of + reload. */ + PUT_MODE (emit_insn_before (gen_rtx_USE (VOIDmode, x), insn), + QImode); x = mem; i = find_reloads_address (GET_MODE (x), &x, XEXP (x, 0), &XEXP (x, 0), opnum, type, ind_levels, insn); @@ -4488,7 +4495,7 @@ find_reloads_address (mode, memrefloc, ad, loc, opnum, type, ind_levels, insn) regno = REGNO (ad); /* If the register is equivalent to an invariant expression, substitute - the invariant, and eliminate any eliminable register references. */ + the invariant, and eliminate any eliminable register references. */ tem = reg_equiv_constant[regno]; if (tem != 0 && (tem = eliminate_regs (tem, mode, insn)) @@ -4530,7 +4537,12 @@ find_reloads_address (mode, memrefloc, ad, loc, opnum, type, ind_levels, insn) && ! rtx_equal_p (tem, reg_equiv_mem[regno])) { *loc = tem; - emit_insn_before (gen_rtx_USE (VOIDmode, ad), insn); + /* We mark the USE with QImode so that we + recognize it as one that can be safely + deleted at the end of reload. */ + PUT_MODE (emit_insn_before (gen_rtx_USE (VOIDmode, ad), + insn), QImode); + /* This doesn't really count as replacing the address as a whole, since it is still a memory access. */ } @@ -4861,7 +4873,11 @@ subst_reg_equivs (ad, insn) if (! rtx_equal_p (mem, reg_equiv_mem[regno])) { subst_reg_equivs_changed = 1; - emit_insn_before (gen_rtx_USE (VOIDmode, ad), insn); + /* We mark the USE with QImode so that we recognize it + as one that can be safely deleted at the end of + reload. */ + PUT_MODE (emit_insn_before (gen_rtx_USE (VOIDmode, ad), insn), + QImode); return mem; } } @@ -5688,7 +5704,12 @@ find_reloads_subreg_address (x, force_replace, opnum, type, this substitution. We have to emit a USE of the pseudo so that delete_output_reload can see it. */ if (replace_reloads && recog_data.operand[opnum] != x) - emit_insn_before (gen_rtx_USE (VOIDmode, SUBREG_REG (x)), insn); + /* We mark the USE with QImode so that we recognize it + as one that can be safely deleted at the end of + reload. */ + PUT_MODE (emit_insn_before (gen_rtx_USE (VOIDmode, + SUBREG_REG (x)), + insn), QImode); x = tem; } } |