From 3fa3592394ca4a2fbe74b8143a3fbbabd98f98dc Mon Sep 17 00:00:00 2001 From: edgar_igl Date: Wed, 7 Jan 2009 13:19:21 +0000 Subject: [PATCH] CRIS: Use a helper for lz. Signed-off-by: Edgar E. Iglesias git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@6205 c046a42c-6fe2-441c-8c8c-71466251a162 --- target-cris/helper.h | 1 + target-cris/op_helper.c | 6 +++++ target-cris/translate.c | 70 +------------------------------------------------ 3 files changed, 8 insertions(+), 69 deletions(-) diff --git a/target-cris/helper.h b/target-cris/helper.h index 18195a0..339a59a 100644 --- a/target-cris/helper.h +++ b/target-cris/helper.h @@ -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) diff --git a/target-cris/op_helper.c b/target-cris/op_helper.c index 6b23980..144da9c 100644 --- a/target-cris/op_helper.c +++ b/target-cris/op_helper.c @@ -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. */ diff --git a/target-cris/translate.c b/target-cris/translate.c index b9aae86..735e444 100644 --- a/target-cris/translate.c +++ b/target-cris/translate.c @@ -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); -- 2.7.4