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[PATCH 09/12] tcg/mips: Try tb-relative addresses in tcg_out_movi
From: |
Richard Henderson |
Subject: |
[PATCH 09/12] tcg/mips: Try tb-relative addresses in tcg_out_movi |
Date: |
Fri, 7 Apr 2023 20:03:56 -0700 |
These addresses are often loaded by the qemu_ld/st slow path,
for loading the retaddr value.
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
---
tcg/mips/tcg-target.c.inc | 13 +++++++++++++
1 file changed, 13 insertions(+)
diff --git a/tcg/mips/tcg-target.c.inc b/tcg/mips/tcg-target.c.inc
index e37aca5986..8c9a4cba9b 100644
--- a/tcg/mips/tcg-target.c.inc
+++ b/tcg/mips/tcg-target.c.inc
@@ -572,6 +572,8 @@ static void tcg_out_movi_pool(TCGContext *s, TCGReg ret,
static void tcg_out_movi_int(TCGContext *s, TCGType type, TCGReg ret,
tcg_target_long arg, TCGReg tbreg)
{
+ tcg_target_long tmp;
+
if (TCG_TARGET_REG_BITS == 64 && type == TCG_TYPE_I32) {
arg = (int32_t)arg;
}
@@ -582,6 +584,17 @@ static void tcg_out_movi_int(TCGContext *s, TCGType type,
TCGReg ret,
}
assert(TCG_TARGET_REG_BITS == 64);
+ /* Load addresses within 2GB of TB with 1 or 3 insns. */
+ tmp = tcg_tbrel_diff(s, (void *)arg);
+ if (tmp == (int16_t)tmp) {
+ tcg_out_opc_imm(s, OPC_DADDIU, ret, tbreg, tmp);
+ return;
+ }
+ if (tcg_out_movi_two(s, ret, tmp)) {
+ tcg_out_opc_reg(s, OPC_DADDU, ret, ret, tbreg);
+ return;
+ }
+
/* Otherwise, put 64-bit constants into the constant pool. */
tcg_out_movi_pool(s, ret, arg, tbreg);
}
--
2.34.1
- [PATCH for-8.1 00/12] tcg/mips: Backend improvements, Richard Henderson, 2023/04/07
- [PATCH 02/12] tcg/mips: Move TCG_GUEST_BASE_REG to S7, Richard Henderson, 2023/04/07
- [PATCH 01/12] tcg/mips: Move TCG_AREG0 to S8, Richard Henderson, 2023/04/07
- [PATCH 03/12] tcg/mips: Unify TCG_GUEST_BASE_REG tests, Richard Henderson, 2023/04/07
- [PATCH 05/12] tcg/mips: Split out tcg_out_movi_one, Richard Henderson, 2023/04/07
- [PATCH 09/12] tcg/mips: Try tb-relative addresses in tcg_out_movi,
Richard Henderson <=
- [PATCH 10/12] tcg/mips: Try three insns with shift and add in tcg_out_movi, Richard Henderson, 2023/04/07
- [PATCH 08/12] tcg/mips: Aggressively use the constant pool for n64 calls, Richard Henderson, 2023/04/07
- [PATCH 07/12] tcg/mips: Use the constant pool for 64-bit constants, Richard Henderson, 2023/04/07
- [PATCH 12/12] tcg/mips: Replace MIPS_BE with HOST_BIG_ENDIAN, Richard Henderson, 2023/04/07
- [PATCH 11/12] tcg/mips: Use qemu_build_not_reached for LO/HI_OFF, Richard Henderson, 2023/04/07
- [PATCH 04/12] tcg/mips: Create and use TCG_REG_TB, Richard Henderson, 2023/04/07
- [PATCH 06/12] tcg/mips: Split out tcg_out_movi_two, Richard Henderson, 2023/04/07