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CRIS: Use a helper for lz. 

Signed-off-by: Edgar E. Iglesias <edgar.iglesias@gmail.com>


git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@6205 c046a42c-6fe2-441c-8c8c-71466251a162
This commit is contained in:
edgar_igl 2009-01-07 13:19:21 +00:00
parent 85220fba35
commit c38ac98da5
3 changed files with 8 additions and 69 deletions
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1
target-cris/helper.h
View File

@ -10,6 +10,7 @@ DEF_HELPER_0(rfn, void);
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)

6
target-cris/op_helper.c
View File

@ -23,6 +23,7 @@
#include "exec.h"
#include "mmu.h"
#include "helper.h"
#include "host-utils.h"
#define D(x)
@ -243,6 +244,11 @@ void helper_rfn(void)
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. */

70
target-cris/translate.c
View File

@ -320,74 +320,6 @@ static void t_gen_mulu(TCGv d, TCGv d2, TCGv a, TCGv b)
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 @@ static void cris_alu_op_exec(DisasContext *dc, int op,
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);