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[Qemu-devel] [PATCH 07/11] tcg-sparc: Improve tcg_out_movi
From: |
Richard Henderson |
Subject: |
[Qemu-devel] [PATCH 07/11] tcg-sparc: Improve tcg_out_movi |
Date: |
Wed, 5 Mar 2014 10:11:17 -0800 |
If bits 31:13 are zero, reduce the insn count by one.
Signed-off-by: Richard Henderson <address@hidden>
---
tcg/sparc/tcg-target.c | 52 ++++++++++++++++++++++++++++++--------------------
1 file changed, 31 insertions(+), 21 deletions(-)
diff --git a/tcg/sparc/tcg-target.c b/tcg/sparc/tcg-target.c
index 3ae014d..e5a5e02 100644
--- a/tcg/sparc/tcg-target.c
+++ b/tcg/sparc/tcg-target.c
@@ -384,37 +384,47 @@ static inline void tcg_out_movi_imm13(TCGContext *s, int
ret, uint32_t arg)
tcg_out_arithi(s, ret, TCG_REG_G0, arg, ARITH_OR);
}
-static inline void tcg_out_movi_imm32(TCGContext *s, int ret, uint32_t arg)
+static void tcg_out_movi(TCGContext *s, TCGType type,
+ TCGReg ret, tcg_target_long arg)
{
- if (check_fit_tl(arg, 13))
+ tcg_target_long hi, lo;
+
+ /* A 13-bit constant sign-extended to 64-bits. */
+ if (check_fit_tl(arg, 13)) {
tcg_out_movi_imm13(s, ret, arg);
- else {
- tcg_out_sethi(s, ret, arg);
- if (arg & 0x3ff)
- tcg_out_arithi(s, ret, ret, arg & 0x3ff, ARITH_OR);
+ return;
}
-}
-static inline void tcg_out_movi(TCGContext *s, TCGType type,
- TCGReg ret, tcg_target_long arg)
-{
- /* All 32-bit constants, as well as 64-bit constants with
- no high bits set go through movi_imm32. */
+ /* A 32-bit constant, or 32-bit zero-extended to 64-bits. */
if (TCG_TARGET_REG_BITS == 32
|| type == TCG_TYPE_I32
- || (arg & ~(tcg_target_long)0xffffffff) == 0) {
- tcg_out_movi_imm32(s, ret, arg);
- } else if (check_fit_tl(arg, 13)) {
- /* A 13-bit constant sign-extended to 64-bits. */
- tcg_out_movi_imm13(s, ret, arg);
- } else if (check_fit_tl(arg, 32)) {
- /* A 32-bit constant sign-extended to 64-bits. */
+ || (arg & ~0xffffffffu) == 0) {
+ tcg_out_sethi(s, ret, arg);
+ if (arg & 0x3ff) {
+ tcg_out_arithi(s, ret, ret, arg & 0x3ff, ARITH_OR);
+ }
+ return;
+ }
+
+ /* A 32-bit constant sign-extended to 64-bits. */
+ if (check_fit_tl(arg, 32)) {
tcg_out_sethi(s, ret, ~arg);
tcg_out_arithi(s, ret, ret, (arg & 0x3ff) | -0x400, ARITH_XOR);
+ return;
+ }
+
+ /* A 64-bit constant decomposed into 2 32-bit pieces. */
+ lo = (int32_t)arg;
+ if (check_fit_tl(lo, 13)) {
+ hi = (arg - lo) >> 31 >> 1;
+ tcg_out_movi(s, TCG_TYPE_I32, ret, hi);
+ tcg_out_arithi(s, ret, ret, 32, SHIFT_SLLX);
+ tcg_out_arithi(s, ret, ret, lo, ARITH_ADD);
} else {
- tcg_out_movi_imm32(s, ret, arg >> (TCG_TARGET_REG_BITS / 2));
+ hi = arg >> 31 >> 1;
+ tcg_out_movi(s, TCG_TYPE_I32, ret, hi);
+ tcg_out_movi(s, TCG_TYPE_I32, TCG_REG_T2, lo);
tcg_out_arithi(s, ret, ret, 32, SHIFT_SLLX);
- tcg_out_movi_imm32(s, TCG_REG_T2, arg);
tcg_out_arith(s, ret, ret, TCG_REG_T2, ARITH_OR);
}
}
--
1.8.5.3
- [Qemu-devel] [PATCH 00/11] tcg-sparc updates, Richard Henderson, 2014/03/05
- [Qemu-devel] [PATCH 01/11] tcg-sparc: Fix ld64 for 32-bit mode, Richard Henderson, 2014/03/05
- [Qemu-devel] [PATCH 02/11] tcg-sparc: Fix tlb read, Richard Henderson, 2014/03/05
- [Qemu-devel] [PATCH 03/11] tcg-sparc: Tidy call+jump patterns, Richard Henderson, 2014/03/05
- [Qemu-devel] [PATCH 04/11] tcg-sparc: Use intptr_t as appropriate, Richard Henderson, 2014/03/05
- [Qemu-devel] [PATCH 05/11] tcg-sparc: Don't handle remainder, Richard Henderson, 2014/03/05
- [Qemu-devel] [PATCH 06/11] tcg-sparc: Dont handle constant arguments to ext32 ops, Richard Henderson, 2014/03/05
- [Qemu-devel] [PATCH 07/11] tcg-sparc: Improve tcg_out_movi,
Richard Henderson <=
- [Qemu-devel] [PATCH 08/11] tcg-sparc: Use TCGMemOp within qemu_ldst routines, Richard Henderson, 2014/03/05
- [Qemu-devel] [PATCH 09/11] tcg-sparc: Tidy tcg_out_tlb_load interface, Richard Henderson, 2014/03/05
- [Qemu-devel] [PATCH 10/11] tcg-sparc: Convert to new ldst helpers, Richard Henderson, 2014/03/05
- [Qemu-devel] [PATCH 11/11] tcg-sparc: Convert to new ldst opcodes, Richard Henderson, 2014/03/05
- Re: [Qemu-devel] [PATCH 00/11] tcg-sparc updates, Mark Cave-Ayland, 2014/03/09