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[Qemu-devel] [PATCH v2 1/8] tcg-ia64: Optimize small arguments to exit_t
From: |
Richard Henderson |
Subject: |
[Qemu-devel] [PATCH v2 1/8] tcg-ia64: Optimize small arguments to exit_tb |
Date: |
Wed, 26 Mar 2014 21:08:06 -0700 |
Saves one bundle for the common case of exit_tb 0.
Signed-off-by: Richard Henderson <address@hidden>
---
tcg/ia64/tcg-target.c | 12 +++++++++---
1 file changed, 9 insertions(+), 3 deletions(-)
diff --git a/tcg/ia64/tcg-target.c b/tcg/ia64/tcg-target.c
index 2d8e00c..7407011 100644
--- a/tcg/ia64/tcg-target.c
+++ b/tcg/ia64/tcg-target.c
@@ -950,15 +950,21 @@ static inline void tcg_out_callr(TCGContext *s, TCGReg
addr)
static void tcg_out_exit_tb(TCGContext *s, tcg_target_long arg)
{
int64_t disp;
- uint64_t imm;
+ uint64_t imm, opc1;
- tcg_out_movi(s, TCG_TYPE_PTR, TCG_REG_R8, arg);
+ /* At least arg == 0 is a common operation. */
+ if (arg == sextract64(arg, 0, 22)) {
+ opc1 = tcg_opc_movi_a(TCG_REG_P0, TCG_REG_R8, arg);
+ } else {
+ tcg_out_movi(s, TCG_TYPE_PTR, TCG_REG_R8, arg);
+ opc1 = INSN_NOP_M;
+ }
disp = tb_ret_addr - s->code_ptr;
imm = (uint64_t)disp >> 4;
tcg_out_bundle(s, mLX,
- INSN_NOP_M,
+ opc1,
tcg_opc_l3 (imm),
tcg_opc_x3 (TCG_REG_P0, OPC_BRL_SPTK_MANY_X3, imm));
}
--
1.8.5.3
- [Qemu-devel] [PATCH v2 0/8] tcg-ia64 ldst updates, Richard Henderson, 2014/03/27
- [Qemu-devel] [PATCH v2 1/8] tcg-ia64: Optimize small arguments to exit_tb,
Richard Henderson <=
- [Qemu-devel] [PATCH v2 2/8] tcg-ia64: Re-bundle the tlb load, Richard Henderson, 2014/03/27
- [Qemu-devel] [PATCH v2 4/8] tcg-ia64: Move tlb addend load into tlb read, Richard Henderson, 2014/03/27
- [Qemu-devel] [PATCH v2 3/8] tcg-ia64: Move bswap for store into tlb load, Richard Henderson, 2014/03/27
- [Qemu-devel] [PATCH v2 5/8] tcg-ia64: Reduce code duplication in tcg_out_qemu_ld, Richard Henderson, 2014/03/27
- [Qemu-devel] [PATCH v2 6/8] tcg-ia64: Convert to new ldst helpers, Richard Henderson, 2014/03/27
- [Qemu-devel] [PATCH v2 7/8] tcg-ia64: Move part of softmmu slow path out of line, Richard Henderson, 2014/03/27
- [Qemu-devel] [PATCH v2 8/8] tcg-ia64: Convert to new ldst opcodes, Richard Henderson, 2014/03/27