From: jiawei <jiawei@iscas.ac.cn>
To: gcc-patches@gcc.gnu.org
Cc: kito.cheng@sifive.com, palmer@rivosinc.com, juzhe.zhong@rivai.ai,
christoph.muellner@vrull.eu, philipp.tomsich@vrull.eu,
wuwei2016@iscas.ac.cn, jiawei <jiawei@iscas.ac.cn>
Subject: [PATCH] RISC-V: Optimal RVV epilogue logic.
Date: Tue, 15 Nov 2022 00:29:18 +0800 [thread overview]
Message-ID: <20221114162918.1563116-1-jiawei@iscas.ac.cn> (raw)
Skip add insn generate if the adjust size equal to zero.
gcc/ChangeLog:
* config/riscv/riscv.cc (riscv_expand_epilogue):
New if control segement.
---
gcc/config/riscv/riscv.cc | 18 ++++++++++--------
1 file changed, 10 insertions(+), 8 deletions(-)
diff --git a/gcc/config/riscv/riscv.cc b/gcc/config/riscv/riscv.cc
index 02a01ca0b7c..af138db7545 100644
--- a/gcc/config/riscv/riscv.cc
+++ b/gcc/config/riscv/riscv.cc
@@ -5186,24 +5186,26 @@ riscv_expand_epilogue (int style)
}
/* Get an rtx for STEP1 that we can add to BASE. */
- rtx adjust = GEN_INT (step1.to_constant ());
- if (!SMALL_OPERAND (step1.to_constant ()))
+ if (step1.to_constant () != 0){
+ rtx adjust = GEN_INT (step1.to_constant ());
+ if (!SMALL_OPERAND (step1.to_constant ()))
{
riscv_emit_move (RISCV_PROLOGUE_TEMP (Pmode), adjust);
adjust = RISCV_PROLOGUE_TEMP (Pmode);
}
- insn = emit_insn (
+ insn = emit_insn (
gen_add3_insn (stack_pointer_rtx, stack_pointer_rtx, adjust));
- rtx dwarf = NULL_RTX;
- rtx cfa_adjust_rtx = gen_rtx_PLUS (Pmode, stack_pointer_rtx,
+ rtx dwarf = NULL_RTX;
+ rtx cfa_adjust_rtx = gen_rtx_PLUS (Pmode, stack_pointer_rtx,
GEN_INT (step2));
- dwarf = alloc_reg_note (REG_CFA_DEF_CFA, cfa_adjust_rtx, dwarf);
- RTX_FRAME_RELATED_P (insn) = 1;
+ dwarf = alloc_reg_note (REG_CFA_DEF_CFA, cfa_adjust_rtx, dwarf);
+ RTX_FRAME_RELATED_P (insn) = 1;
- REG_NOTES (insn) = dwarf;
+ REG_NOTES (insn) = dwarf;
+ }
}
else if (frame_pointer_needed)
{
--
2.25.1
next reply other threads:[~2022-11-14 16:29 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-11-14 16:29 jiawei [this message]
2022-11-15 1:48 ` Kito Cheng
2022-11-15 2:37 ` jiawei
2022-11-15 2:46 ` juzhe.zhong
2022-11-15 3:13 ` Kito Cheng
2022-11-15 3:42 ` Jeff Law
2022-11-15 3:30 ` Jeff Law
2022-11-15 10:35 ` Philipp Tomsich
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