return num_insns;
}
+/* Add DELTA to REGNUM in mode MODE. SCRATCHREG can be used to hold a
+ temporary value if necessary. FRAME_RELATED_P should be true if
+ the RTX_FRAME_RELATED flag should be set and CFA adjustments added
+ to the generated instructions. If SCRATCHREG is known to hold
+ abs (delta), EMIT_MOVE_IMM can be set to false to avoid emitting the
+ immediate again.
+
+ Since this function may be used to adjust the stack pointer, we must
+ ensure that it cannot cause transient stack deallocation (for example
+ by first incrementing SP and then decrementing when adjusting by a
+ large immediate). */
+
+static void
+aarch64_add_constant_internal (scalar_int_mode mode, int regnum,
+ int scratchreg, HOST_WIDE_INT delta,
+ bool frame_related_p, bool emit_move_imm)
+{
+ HOST_WIDE_INT mdelta = abs_hwi (delta);
+ rtx this_rtx = gen_rtx_REG (mode, regnum);
+ rtx_insn *insn;
+
+ if (!mdelta)
+ return;
+
+ /* Single instruction adjustment. */
+ if (aarch64_uimm12_shift (mdelta))
+ {
+ insn = emit_insn (gen_add2_insn (this_rtx, GEN_INT (delta)));
+ RTX_FRAME_RELATED_P (insn) = frame_related_p;
+ return;
+ }
+
+ /* Emit 2 additions/subtractions if the adjustment is less than 24 bits.
+ Only do this if mdelta is not a 16-bit move as adjusting using a move
+ is better. */
+ if (mdelta < 0x1000000 && !aarch64_move_imm (mdelta, mode))
+ {
+ HOST_WIDE_INT low_off = mdelta & 0xfff;
+
+ low_off = delta < 0 ? -low_off : low_off;
+ insn = emit_insn (gen_add2_insn (this_rtx, GEN_INT (low_off)));
+ RTX_FRAME_RELATED_P (insn) = frame_related_p;
+ insn = emit_insn (gen_add2_insn (this_rtx, GEN_INT (delta - low_off)));
+ RTX_FRAME_RELATED_P (insn) = frame_related_p;
+ return;
+ }
+
+ /* Emit a move immediate if required and an addition/subtraction. */
+ rtx scratch_rtx = gen_rtx_REG (mode, scratchreg);
+ if (emit_move_imm)
+ aarch64_internal_mov_immediate (scratch_rtx, GEN_INT (mdelta), true, mode);
+ insn = emit_insn (delta < 0 ? gen_sub2_insn (this_rtx, scratch_rtx)
+ : gen_add2_insn (this_rtx, scratch_rtx));
+ if (frame_related_p)
+ {
+ RTX_FRAME_RELATED_P (insn) = frame_related_p;
+ rtx adj = plus_constant (mode, this_rtx, delta);
+ add_reg_note (insn , REG_CFA_ADJUST_CFA, gen_rtx_SET (this_rtx, adj));
+ }
+}
+
+static inline void
+aarch64_add_constant (scalar_int_mode mode, int regnum, int scratchreg,
+ HOST_WIDE_INT delta)
+{
+ aarch64_add_constant_internal (mode, regnum, scratchreg, delta, false, true);
+}
+
+static inline void
+aarch64_add_sp (int scratchreg, HOST_WIDE_INT delta, bool emit_move_imm)
+{
+ aarch64_add_constant_internal (Pmode, SP_REGNUM, scratchreg, delta,
+ true, emit_move_imm);
+}
+
+static inline void
+aarch64_sub_sp (int scratchreg, HOST_WIDE_INT delta, bool frame_related_p)
+{
+ aarch64_add_constant_internal (Pmode, SP_REGNUM, scratchreg, -delta,
+ frame_related_p, true);
+}
void
aarch64_expand_mov_immediate (rtx dest, rtx imm)
as_a <scalar_int_mode> (mode));
}
-/* Add DELTA to REGNUM in mode MODE. SCRATCHREG can be used to hold a
- temporary value if necessary. FRAME_RELATED_P should be true if
- the RTX_FRAME_RELATED flag should be set and CFA adjustments added
- to the generated instructions. If SCRATCHREG is known to hold
- abs (delta), EMIT_MOVE_IMM can be set to false to avoid emitting the
- immediate again.
-
- Since this function may be used to adjust the stack pointer, we must
- ensure that it cannot cause transient stack deallocation (for example
- by first incrementing SP and then decrementing when adjusting by a
- large immediate). */
-
-static void
-aarch64_add_constant_internal (scalar_int_mode mode, int regnum,
- int scratchreg, HOST_WIDE_INT delta,
- bool frame_related_p, bool emit_move_imm)
-{
- HOST_WIDE_INT mdelta = abs_hwi (delta);
- rtx this_rtx = gen_rtx_REG (mode, regnum);
- rtx_insn *insn;
-
- if (!mdelta)
- return;
-
- /* Single instruction adjustment. */
- if (aarch64_uimm12_shift (mdelta))
- {
- insn = emit_insn (gen_add2_insn (this_rtx, GEN_INT (delta)));
- RTX_FRAME_RELATED_P (insn) = frame_related_p;
- return;
- }
-
- /* Emit 2 additions/subtractions if the adjustment is less than 24 bits.
- Only do this if mdelta is not a 16-bit move as adjusting using a move
- is better. */
- if (mdelta < 0x1000000 && !aarch64_move_imm (mdelta, mode))
- {
- HOST_WIDE_INT low_off = mdelta & 0xfff;
-
- low_off = delta < 0 ? -low_off : low_off;
- insn = emit_insn (gen_add2_insn (this_rtx, GEN_INT (low_off)));
- RTX_FRAME_RELATED_P (insn) = frame_related_p;
- insn = emit_insn (gen_add2_insn (this_rtx, GEN_INT (delta - low_off)));
- RTX_FRAME_RELATED_P (insn) = frame_related_p;
- return;
- }
-
- /* Emit a move immediate if required and an addition/subtraction. */
- rtx scratch_rtx = gen_rtx_REG (mode, scratchreg);
- if (emit_move_imm)
- aarch64_internal_mov_immediate (scratch_rtx, GEN_INT (mdelta), true, mode);
- insn = emit_insn (delta < 0 ? gen_sub2_insn (this_rtx, scratch_rtx)
- : gen_add2_insn (this_rtx, scratch_rtx));
- if (frame_related_p)
- {
- RTX_FRAME_RELATED_P (insn) = frame_related_p;
- rtx adj = plus_constant (mode, this_rtx, delta);
- add_reg_note (insn , REG_CFA_ADJUST_CFA, gen_rtx_SET (this_rtx, adj));
- }
-}
-
-static inline void
-aarch64_add_constant (scalar_int_mode mode, int regnum, int scratchreg,
- HOST_WIDE_INT delta)
-{
- aarch64_add_constant_internal (mode, regnum, scratchreg, delta, false, true);
-}
-
-static inline void
-aarch64_add_sp (int scratchreg, HOST_WIDE_INT delta, bool emit_move_imm)
-{
- aarch64_add_constant_internal (Pmode, SP_REGNUM, scratchreg, delta,
- true, emit_move_imm);
-}
-
-static inline void
-aarch64_sub_sp (int scratchreg, HOST_WIDE_INT delta, bool frame_related_p)
-{
- aarch64_add_constant_internal (Pmode, SP_REGNUM, scratchreg, -delta,
- frame_related_p, true);
-}
-
static bool
aarch64_function_ok_for_sibcall (tree decl ATTRIBUTE_UNUSED,
tree exp ATTRIBUTE_UNUSED)
projects / gcc.git / commitdiff