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-rw-r--r--gcc/config/xtensa/xtensa.cc151
1 files changed, 106 insertions, 45 deletions
diff --git a/gcc/config/xtensa/xtensa.cc b/gcc/config/xtensa/xtensa.cc
index ae44199..a1f1849 100644
--- a/gcc/config/xtensa/xtensa.cc
+++ b/gcc/config/xtensa/xtensa.cc
@@ -104,6 +104,7 @@ struct GTY(()) machine_function
bool frame_laid_out;
bool epilogue_done;
bool inhibit_logues_a1_adjusts;
+ rtx last_logues_a9_content;
};
/* Vector, indexed by hard register number, which contains 1 for a
@@ -2518,6 +2519,86 @@ xtensa_split_DI_reg_imm (rtx *operands)
}
+/* Try to split an integer value into what are suitable for two consecutive
+ immediate addition instructions, ADDI or ADDMI. */
+
+static bool
+xtensa_split_imm_two_addends (HOST_WIDE_INT imm, HOST_WIDE_INT v[2])
+{
+ HOST_WIDE_INT v0, v1;
+
+ if (imm < -32768)
+ v0 = -32768, v1 = imm + 32768;
+ else if (imm > 32512)
+ v0 = 32512, v1 = imm - 32512;
+ else if (TARGET_DENSITY && xtensa_simm12b (imm))
+ /* A pair of MOVI(.N) and ADD.N is one or two bytes less than two
+ immediate additions if TARGET_DENSITY. */
+ return false;
+ else
+ v0 = (imm + 128) & ~255L, v1 = imm - v0;
+
+ if (xtensa_simm8 (v1) || xtensa_simm8x256 (v1))
+ {
+ v[0] = v0, v[1] = v1;
+ return true;
+ }
+
+ return false;
+}
+
+
+/* Helper function for integer immediate addition with scratch register
+ as needed, that splits and emits either up to two ADDI/ADDMI machine
+ instructions or an addition by register following an integer immediate
+ load (which may later be transformed by constantsynth).
+
+ If 'scratch' is NULL_RTX but still needed, a new pseudo-register will
+ be allocated. Thus, after the reload/LRA pass, the specified scratch
+ register must be a hard one. */
+
+static bool
+xtensa_emit_add_imm (rtx dst, rtx src, HOST_WIDE_INT imm, rtx scratch,
+ bool need_note)
+{
+ bool retval = false;
+ HOST_WIDE_INT v[2];
+ rtx_insn *insn;
+
+ if (imm == 0)
+ return false;
+
+ if (xtensa_simm8 (imm) || xtensa_simm8x256 (imm))
+ insn = emit_insn (gen_addsi3 (dst, src, GEN_INT (imm)));
+ else if (xtensa_split_imm_two_addends (imm, v))
+ {
+ if (!scratch)
+ scratch = gen_reg_rtx (SImode);
+ emit_insn (gen_addsi3 (scratch, src, GEN_INT (v[0])));
+ insn = emit_insn (gen_addsi3 (dst, scratch, GEN_INT (v[1])));
+ }
+ else
+ {
+ if (scratch)
+ emit_move_insn (scratch, GEN_INT (imm));
+ else
+ scratch = force_reg (SImode, GEN_INT (imm));
+ retval = true;
+ insn = emit_insn (gen_addsi3 (dst, src, scratch));
+ }
+
+ if (need_note)
+ {
+ rtx note_rtx = gen_rtx_SET (dst, plus_constant (Pmode, src, imm));
+
+ RTX_FRAME_RELATED_P (insn) = 1;
+ add_reg_note (insn, REG_FRAME_RELATED_EXPR, note_rtx);
+ }
+
+ return retval;
+}
+
+
/* Implement TARGET_CANNOT_FORCE_CONST_MEM. */
static bool
@@ -3245,41 +3326,33 @@ xtensa_initial_elimination_offset (int from, int to ATTRIBUTE_UNUSED)
static void
xtensa_emit_adjust_stack_ptr (HOST_WIDE_INT offset, int flags)
{
+ rtx src, scratch;
rtx_insn *insn;
- rtx ptr = (flags & ADJUST_SP_FRAME_PTR) ? hard_frame_pointer_rtx
- : stack_pointer_rtx;
if (cfun->machine->inhibit_logues_a1_adjusts)
return;
- if (xtensa_simm8 (offset)
- || xtensa_simm8x256 (offset))
- insn = emit_insn (gen_addsi3 (stack_pointer_rtx, ptr, GEN_INT (offset)));
- else
- {
- rtx tmp_reg = gen_rtx_REG (Pmode, A9_REG);
+ src = (flags & ADJUST_SP_FRAME_PTR)
+ ? hard_frame_pointer_rtx : stack_pointer_rtx;
+ scratch = gen_rtx_REG (Pmode, A9_REG);
- if (offset < 0)
- {
- emit_move_insn (tmp_reg, GEN_INT (-offset));
- insn = emit_insn (gen_subsi3 (stack_pointer_rtx, ptr, tmp_reg));
- }
- else
- {
- emit_move_insn (tmp_reg, GEN_INT (offset));
- insn = emit_insn (gen_addsi3 (stack_pointer_rtx, ptr, tmp_reg));
- }
- }
-
- if (flags & ADJUST_SP_NEED_NOTE)
+ if (df && DF_REG_DEF_COUNT (A9_REG) == 0
+ && cfun->machine->last_logues_a9_content
+ && -INTVAL (cfun->machine->last_logues_a9_content) == offset)
{
- rtx note_rtx = gen_rtx_SET (stack_pointer_rtx,
- plus_constant (Pmode, stack_pointer_rtx,
- offset));
+ insn = emit_insn (gen_subsi3 (stack_pointer_rtx, src, scratch));
+ if (flags & ADJUST_SP_NEED_NOTE)
+ {
+ rtx note_rtx = gen_rtx_SET (stack_pointer_rtx,
+ plus_constant (Pmode, src, offset));
- RTX_FRAME_RELATED_P (insn) = 1;
- add_reg_note (insn, REG_FRAME_RELATED_EXPR, note_rtx);
+ RTX_FRAME_RELATED_P (insn) = 1;
+ add_reg_note (insn, REG_FRAME_RELATED_EXPR, note_rtx);
+ }
}
+ else if (xtensa_emit_add_imm (stack_pointer_rtx, src, offset, scratch,
+ (flags & ADJUST_SP_NEED_NOTE)))
+ cfun->machine->last_logues_a9_content = GEN_INT (offset);
}
/* minimum frame = reg save area (4 words) plus static chain (1 word)
@@ -3307,8 +3380,9 @@ xtensa_expand_prologue (void)
/* Use a8 as a temporary since a0-a7 may be live. */
rtx tmp_reg = gen_rtx_REG (Pmode, A8_REG);
emit_insn (gen_entry (GEN_INT (MIN_FRAME_SIZE)));
- emit_move_insn (tmp_reg, GEN_INT (total_size - MIN_FRAME_SIZE));
- emit_insn (gen_subsi3 (tmp_reg, stack_pointer_rtx, tmp_reg));
+ xtensa_emit_add_imm (tmp_reg, stack_pointer_rtx,
+ MIN_FRAME_SIZE - total_size,
+ tmp_reg, false);
insn = emit_insn (gen_movsi (stack_pointer_rtx, tmp_reg));
}
}
@@ -3540,8 +3614,8 @@ xtensa_set_return_address (rtx address, rtx scratch)
if (total_size > 1024)
{
- emit_move_insn (scratch, GEN_INT (total_size - UNITS_PER_WORD));
- emit_insn (gen_addsi3 (scratch, frame, scratch));
+ xtensa_emit_add_imm (scratch, frame, total_size - UNITS_PER_WORD,
+ scratch, false);
a0_addr = scratch;
}
@@ -5101,15 +5175,7 @@ xtensa_output_mi_thunk (FILE *file, tree thunk ATTRIBUTE_UNUSED,
this_rtx = gen_rtx_REG (Pmode, A0_REG + this_reg_no);
if (delta)
- {
- if (xtensa_simm8 (delta))
- emit_insn (gen_addsi3 (this_rtx, this_rtx, GEN_INT (delta)));
- else
- {
- emit_move_insn (temp0, GEN_INT (delta));
- emit_insn (gen_addsi3 (this_rtx, this_rtx, temp0));
- }
- }
+ xtensa_emit_add_imm (this_rtx, this_rtx, delta, temp0, false);
if (vcall_offset)
{
@@ -5119,13 +5185,8 @@ xtensa_output_mi_thunk (FILE *file, tree thunk ATTRIBUTE_UNUSED,
emit_move_insn (temp0, gen_rtx_MEM (Pmode, this_rtx));
if (xtensa_uimm8x4 (vcall_offset))
addr = plus_constant (Pmode, temp0, vcall_offset);
- else if (xtensa_simm8 (vcall_offset))
- emit_insn (gen_addsi3 (temp1, temp0, GEN_INT (vcall_offset)));
else
- {
- emit_move_insn (temp1, GEN_INT (vcall_offset));
- emit_insn (gen_addsi3 (temp1, temp0, temp1));
- }
+ xtensa_emit_add_imm (temp1, temp0, vcall_offset, temp1, false);
emit_move_insn (temp1, gen_rtx_MEM (Pmode, addr));
emit_insn (gen_add2_insn (this_rtx, temp1));
}
generated by cgit v1.1 at 2024-10-05 06:15:21 +0000