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[Qemu-devel] [6205] CRIS: Use a helper for lz.
From: |
Edgar E. Iglesias |
Subject: |
[Qemu-devel] [6205] CRIS: Use a helper for lz. |
Date: |
Wed, 07 Jan 2009 13:19:22 +0000 |
Revision: 6205
http://svn.sv.gnu.org/viewvc/?view=rev&root=qemu&revision=6205
Author: edgar_igl
Date: 2009-01-07 13:19:21 +0000 (Wed, 07 Jan 2009)
Log Message:
-----------
CRIS: Use a helper for lz.
Signed-off-by: Edgar E. Iglesias <address@hidden>
Modified Paths:
--------------
trunk/target-cris/helper.h
trunk/target-cris/op_helper.c
trunk/target-cris/translate.c
Modified: trunk/target-cris/helper.h
===================================================================
--- trunk/target-cris/helper.h 2009-01-07 13:15:29 UTC (rev 6204)
+++ trunk/target-cris/helper.h 2009-01-07 13:19:21 UTC (rev 6205)
@@ -10,6 +10,7 @@
DEF_HELPER_2(movl_sreg_reg, void, i32, i32)
DEF_HELPER_2(movl_reg_sreg, void, i32, i32)
+DEF_HELPER_FLAGS_1(lz, TCG_CALL_PURE, i32, i32);
DEF_HELPER_FLAGS_3(btst, TCG_CALL_PURE, i32, i32, i32, i32);
DEF_HELPER_0(evaluate_flags_muls, void)
Modified: trunk/target-cris/op_helper.c
===================================================================
--- trunk/target-cris/op_helper.c 2009-01-07 13:15:29 UTC (rev 6204)
+++ trunk/target-cris/op_helper.c 2009-01-07 13:19:21 UTC (rev 6205)
@@ -23,6 +23,7 @@
#include "exec.h"
#include "mmu.h"
#include "helper.h"
+#include "host-utils.h"
#define D(x)
@@ -243,6 +244,11 @@
env->pregs[PR_CCS] |= M_FLAG;
}
+uint32_t helper_lz(uint32_t t0)
+{
+ return clz32(t0);
+}
+
uint32_t helper_btst(uint32_t t0, uint32_t t1, uint32_t ccs)
{
/* FIXME: clean this up. */
Modified: trunk/target-cris/translate.c
===================================================================
--- trunk/target-cris/translate.c 2009-01-07 13:15:29 UTC (rev 6204)
+++ trunk/target-cris/translate.c 2009-01-07 13:19:21 UTC (rev 6205)
@@ -320,74 +320,6 @@
tcg_temp_free_i64(t1);
}
-/* 32bit branch-free binary search for counting leading zeros. */
-static void t_gen_lz_i32(TCGv d, TCGv x)
-{
- TCGv_i32 y, m, n;
-
- y = tcg_temp_new_i32();
- m = tcg_temp_new_i32();
- n = tcg_temp_new_i32();
-
- /* y = -(x >> 16) */
- tcg_gen_shri_i32(y, x, 16);
- tcg_gen_neg_i32(y, y);
-
- /* m = (y >> 16) & 16 */
- tcg_gen_sari_i32(m, y, 16);
- tcg_gen_andi_i32(m, m, 16);
-
- /* n = 16 - m */
- tcg_gen_sub_i32(n, tcg_const_i32(16), m);
- /* x = x >> m */
- tcg_gen_shr_i32(x, x, m);
-
- /* y = x - 0x100 */
- tcg_gen_subi_i32(y, x, 0x100);
- /* m = (y >> 16) & 8 */
- tcg_gen_sari_i32(m, y, 16);
- tcg_gen_andi_i32(m, m, 8);
- /* n = n + m */
- tcg_gen_add_i32(n, n, m);
- /* x = x << m */
- tcg_gen_shl_i32(x, x, m);
-
- /* y = x - 0x1000 */
- tcg_gen_subi_i32(y, x, 0x1000);
- /* m = (y >> 16) & 4 */
- tcg_gen_sari_i32(m, y, 16);
- tcg_gen_andi_i32(m, m, 4);
- /* n = n + m */
- tcg_gen_add_i32(n, n, m);
- /* x = x << m */
- tcg_gen_shl_i32(x, x, m);
-
- /* y = x - 0x4000 */
- tcg_gen_subi_i32(y, x, 0x4000);
- /* m = (y >> 16) & 2 */
- tcg_gen_sari_i32(m, y, 16);
- tcg_gen_andi_i32(m, m, 2);
- /* n = n + m */
- tcg_gen_add_i32(n, n, m);
- /* x = x << m */
- tcg_gen_shl_i32(x, x, m);
-
- /* y = x >> 14 */
- tcg_gen_shri_i32(y, x, 14);
- /* m = y & ~(y >> 1) */
- tcg_gen_sari_i32(m, y, 1);
- tcg_gen_not_i32(m, m);
- tcg_gen_and_i32(m, m, y);
-
- /* d = n + 2 - m */
- tcg_gen_addi_i32(d, n, 2);
- tcg_gen_sub_i32(d, d, m);
-
- tcg_temp_free(y);
- tcg_temp_free(m);
- tcg_temp_free(n);
-}
-
static void t_gen_cris_dstep(TCGv d, TCGv a, TCGv b)
{
int l1;
@@ -825,7 +757,7 @@
t_gen_subx_carry(dc, dst);
break;
case CC_OP_LZ:
- t_gen_lz_i32(dst, b);
+ gen_helper_lz(dst, b);
break;
case CC_OP_MULS:
t_gen_muls(dst, cpu_PR[PR_MOF], a, b);
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