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[Qemu-devel] [PATCH v3 06/11] target-arm: Implement fcsel with movcond
From: |
Richard Henderson |
Subject: |
[Qemu-devel] [PATCH v3 06/11] target-arm: Implement fcsel with movcond |
Date: |
Thu, 10 Sep 2015 11:18:18 -0700 |
Reviewed-by: Peter Maydell <address@hidden>
Signed-off-by: Richard Henderson <address@hidden>
---
target-arm/translate-a64.c | 45 +++++++++++++++++----------------------------
1 file changed, 17 insertions(+), 28 deletions(-)
diff --git a/target-arm/translate-a64.c b/target-arm/translate-a64.c
index 7ce286e..bb0d752 100644
--- a/target-arm/translate-a64.c
+++ b/target-arm/translate-a64.c
@@ -4205,20 +4205,6 @@ static void disas_fp_ccomp(DisasContext *s, uint32_t
insn)
}
}
-/* copy src FP register to dst FP register; type specifies single or double */
-static void gen_mov_fp2fp(DisasContext *s, int type, int dst, int src)
-{
- if (type) {
- TCGv_i64 v = read_fp_dreg(s, src);
- write_fp_dreg(s, dst, v);
- tcg_temp_free_i64(v);
- } else {
- TCGv_i32 v = read_fp_sreg(s, src);
- write_fp_sreg(s, dst, v);
- tcg_temp_free_i32(v);
- }
-}
-
/* C3.6.24 Floating point conditional select
* 31 30 29 28 24 23 22 21 20 16 15 12 11 10 9 5 4 0
* +---+---+---+-----------+------+---+------+------+-----+------+------+
@@ -4228,7 +4214,8 @@ static void gen_mov_fp2fp(DisasContext *s, int type, int
dst, int src)
static void disas_fp_csel(DisasContext *s, uint32_t insn)
{
unsigned int mos, type, rm, cond, rn, rd;
- TCGLabel *label_continue = NULL;
+ TCGv_i64 t_true, t_false, t_zero;
+ DisasCompare64 c;
mos = extract32(insn, 29, 3);
type = extract32(insn, 22, 2); /* 0 = single, 1 = double */
@@ -4246,21 +4233,23 @@ static void disas_fp_csel(DisasContext *s, uint32_t
insn)
return;
}
- if (cond < 0x0e) { /* not always */
- TCGLabel *label_match = gen_new_label();
- label_continue = gen_new_label();
- arm_gen_test_cc(cond, label_match);
- /* nomatch: */
- gen_mov_fp2fp(s, type, rd, rm);
- tcg_gen_br(label_continue);
- gen_set_label(label_match);
- }
+ /* Zero extend sreg inputs to 64 bits now. */
+ t_true = tcg_temp_new_i64();
+ t_false = tcg_temp_new_i64();
+ read_vec_element(s, t_true, rn, 0, type ? MO_64 : MO_32);
+ read_vec_element(s, t_false, rm, 0, type ? MO_64 : MO_32);
- gen_mov_fp2fp(s, type, rd, rn);
+ a64_test_cc(&c, cond);
+ t_zero = tcg_const_i64(0);
+ tcg_gen_movcond_i64(c.cond, t_true, c.value, t_zero, t_true, t_false);
+ tcg_temp_free_i64(t_zero);
+ tcg_temp_free_i64(t_false);
+ a64_free_cc(&c);
- if (cond < 0x0e) { /* continue */
- gen_set_label(label_continue);
- }
+ /* Note that sregs write back zeros to the high bits,
+ and we've already done the zero-extension. */
+ write_fp_dreg(s, rd, t_true);
+ tcg_temp_free_i64(t_true);
}
/* C3.6.25 Floating-point data-processing (1 source) - single precision */
--
2.4.3
- [Qemu-devel] [PATCH v3 00/11] target-arm improvments for aarch64, Richard Henderson, 2015/09/10
- [Qemu-devel] [PATCH v3 03/11] target-arm: Handle always condition codes within arm_test_cc, Richard Henderson, 2015/09/10
- [Qemu-devel] [PATCH v3 02/11] target-arm: Introduce DisasCompare, Richard Henderson, 2015/09/10
- [Qemu-devel] [PATCH v3 01/11] target-arm: Share all common TCG temporaries, Richard Henderson, 2015/09/10
- [Qemu-devel] [PATCH v3 04/11] target-arm: Use setcond and movcond for csel, Richard Henderson, 2015/09/10
- [Qemu-devel] [PATCH v3 07/11] target-arm: Recognize SXTB, SXTH, SXTW, ASR, Richard Henderson, 2015/09/10
- [Qemu-devel] [PATCH v3 08/11] target-arm: Recognize UXTB, UXTH, LSR, LSL, Richard Henderson, 2015/09/10
- [Qemu-devel] [PATCH v3 05/11] target-arm: Implement ccmp branchless, Richard Henderson, 2015/09/10
- [Qemu-devel] [PATCH v3 09/11] target-arm: Eliminate unnecessary zero-extend in disas_bitfield, Richard Henderson, 2015/09/10
- [Qemu-devel] [PATCH v3 11/11] target-arm: Use tcg_gen_extrh_i64_i32, Richard Henderson, 2015/09/10
- [Qemu-devel] [PATCH v3 06/11] target-arm: Implement fcsel with movcond,
Richard Henderson <=
- [Qemu-devel] [PATCH v3 10/11] target-arm: Recognize ROR, Richard Henderson, 2015/09/10
- Re: [Qemu-devel] [PATCH v3 00/11] target-arm improvments for aarch64, Peter Maydell, 2015/09/11