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[Qemu-devel] [PATCH 07/14] tcg-ppc64: Fold constant call address into de
From: |
Richard Henderson |
Subject: |
[Qemu-devel] [PATCH 07/14] tcg-ppc64: Fold constant call address into descriptor load |
Date: |
Sun, 1 Sep 2013 09:16:06 -0700 |
Eliminates one insn per call:
: lis r2,4165
-: ori r2,r2,59616
-: ld r0,0(r2)
+: ld r0,-5920(r2)
: mtctr r0
-: ld r2,8(r2)
+: ld r2,-5912(r2)
: bctrl
Signed-off-by: Richard Henderson <address@hidden>
---
tcg/ppc64/tcg-target.c | 14 +++++++++++---
1 file changed, 11 insertions(+), 3 deletions(-)
diff --git a/tcg/ppc64/tcg-target.c b/tcg/ppc64/tcg-target.c
index e631991..033518c 100644
--- a/tcg/ppc64/tcg-target.c
+++ b/tcg/ppc64/tcg-target.c
@@ -713,16 +713,24 @@ static void tcg_out_call(TCGContext *s, tcg_target_long
arg, int const_arg)
tcg_out32(s, BCLR | BO_ALWAYS | LK);
}
#else
- int reg = arg;
+ TCGReg reg = arg;
+ int ofs = 0;
if (const_arg) {
+ /* Fold the low bits of the constant into the addresses below. */
+ ofs = (int16_t)arg;
+ if (ofs + 8 < 0x8000) {
+ arg -= ofs;
+ } else {
+ ofs = 0;
+ }
reg = TCG_REG_R2;
tcg_out_movi(s, TCG_TYPE_I64, reg, arg);
}
- tcg_out32(s, LD | TAI(TCG_REG_R0, reg, 0));
+ tcg_out32(s, LD | TAI(TCG_REG_R0, reg, ofs));
tcg_out32(s, MTSPR | RA(TCG_REG_R0) | CTR);
- tcg_out32(s, LD | TAI(TCG_REG_R2, reg, 8));
+ tcg_out32(s, LD | TAI(TCG_REG_R2, reg, ofs + 8));
tcg_out32(s, BCCTR | BO_ALWAYS | LK);
#endif
}
--
1.8.3.1
- [Qemu-devel] [PATCH 00/14] tcg-ppc64 improvements, Richard Henderson, 2013/09/01
- [Qemu-devel] [PATCH 01/14] tcg-ppc64: Reformat tcg-target.c, Richard Henderson, 2013/09/01
- [Qemu-devel] [PATCH 02/14] tcg-ppc64: More use of TAI and SAI helper macros, Richard Henderson, 2013/09/01
- [Qemu-devel] [PATCH 03/14] tcg-ppc64: Use TCG_REG_Rn constants, Richard Henderson, 2013/09/01
- [Qemu-devel] [PATCH 04/14] tcg-ppc64: Use tcg_out64, Richard Henderson, 2013/09/01
- [Qemu-devel] [PATCH 06/14] tcg-ppc64: Don't load the static chain from TCG, Richard Henderson, 2013/09/01
- [Qemu-devel] [PATCH 05/14] tcg-ppc64: Avoid code for nop move, Richard Henderson, 2013/09/01
- [Qemu-devel] [PATCH 07/14] tcg-ppc64: Fold constant call address into descriptor load,
Richard Henderson <=
- [Qemu-devel] [PATCH 08/14] tcg-ppc64: Look through a constant function descriptor, Richard Henderson, 2013/09/01
- [Qemu-devel] [PATCH 09/14] tcg-ppc64: Tidy register allocation order, Richard Henderson, 2013/09/01
- [Qemu-devel] [PATCH 11/14] tcg-ppc64: Implement tcg_register_jit, Richard Henderson, 2013/09/01
- [Qemu-devel] [PATCH 10/14] tcg-ppc64: Handle long offsets better, Richard Henderson, 2013/09/01
- [Qemu-devel] [PATCH 12/14] tcg-ppc64: Streamline tcg_out_tlb_read, Richard Henderson, 2013/09/01
- [Qemu-devel] [PATCH 13/14] tcg-ppc64: Add _noaddr functions for emitting forward branches, Richard Henderson, 2013/09/01
- [Qemu-devel] [PATCH 14/14] tcg-ppc64: Implement CONFIG_QEMU_LDST_OPTIMIZATION, Richard Henderson, 2013/09/01