From 885c9a395a444eb03053a2cae0e5316981b823db Mon Sep 17 00:00:00 2001 From: Joern Rennecke Date: Thu, 21 Nov 1996 20:53:26 +0000 Subject: [PATCH] (output_stack_adjust): New argument TEMP. Changed all callers. If the adjust cannot be done with one, but can be done with two CONST_OK_FOR_I constants, do it that way. From-SVN: r13213 --- gcc/config/sh/sh.c | 40 ++++++++++++++++++++++++++++++---------- 1 file changed, 30 insertions(+), 10 deletions(-) diff --git a/gcc/config/sh/sh.c b/gcc/config/sh/sh.c index c1bfc0e7476..11d662ae602 100644 --- a/gcc/config/sh/sh.c +++ b/gcc/config/sh/sh.c @@ -2473,12 +2473,15 @@ output_jump_label_table () static int extra_push; -/* Adjust the stack and return the number of bytes taken to do it. */ +/* Adjust the stack by SIZE bytes. REG holds the rtl of the register + to be adjusted, and TEMP, if nonnegative, holds the register number + of a general register that we may clobber. */ static void -output_stack_adjust (size, reg) +output_stack_adjust (size, reg, temp) int size; rtx reg; + int temp; { if (size) { @@ -2487,9 +2490,25 @@ output_stack_adjust (size, reg) if (! CONST_OK_FOR_I (size)) { - rtx reg = gen_rtx (REG, SImode, 3); - emit_insn (gen_movsi (reg, val)); - val = reg; + if (CONST_OK_FOR_I (size / 2) && CONST_OK_FOR_I (size - size / 2)) + { + val = GEN_INT (size / 2); + emit_insn (gen_addsi3 (reg, reg, val)); + val = GEN_INT (size - size / 2); + } + else + { + rtx reg; + + /* If TEMP is invalid, we could temporarily save a general + register to MACL. However, there is currently no need + to handle this case, so just abort when we see it. */ + if (temp < 0) + abort (); + reg = gen_rtx (REG, SImode, temp); + emit_insn (gen_movsi (reg, val)); + val = reg; + } } insn = gen_addsi3 (reg, reg, val); @@ -2615,7 +2634,8 @@ sh_expand_prologue () /* We have pretend args if we had an object sent partially in registers and partially on the stack, e.g. a large structure. */ - output_stack_adjust (-current_function_pretend_args_size, stack_pointer_rtx); + output_stack_adjust (-current_function_pretend_args_size, + stack_pointer_rtx, 3); extra_push = 0; @@ -2644,7 +2664,7 @@ sh_expand_prologue () push_regs (live_regs_mask, live_regs_mask2); - output_stack_adjust (-get_frame_size (), stack_pointer_rtx); + output_stack_adjust (-get_frame_size (), stack_pointer_rtx, 3); if (frame_pointer_needed) emit_insn (gen_movsi (frame_pointer_rtx, stack_pointer_rtx)); @@ -2665,11 +2685,11 @@ sh_expand_epilogue () to ensure that instruction scheduling won't move the stack pointer adjust before instructions reading from the frame. This can fail if there is an interrupt which then writes to the stack. */ - output_stack_adjust (get_frame_size (), frame_pointer_rtx); + output_stack_adjust (get_frame_size (), frame_pointer_rtx, 7); emit_insn (gen_movsi (stack_pointer_rtx, frame_pointer_rtx)); } else - output_stack_adjust (get_frame_size (), stack_pointer_rtx); + output_stack_adjust (get_frame_size (), stack_pointer_rtx, 7); /* Pop all the registers. */ @@ -2683,7 +2703,7 @@ sh_expand_epilogue () } output_stack_adjust (extra_push + current_function_pretend_args_size, - stack_pointer_rtx); + stack_pointer_rtx, 7); } /* Clear variables at function end. */ -- 2.30.2