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authorRichard Henderson <richard.henderson@linaro.org>2018-05-18 17:48:08 +0100
committerPeter Maydell <peter.maydell@linaro.org>2018-05-18 17:48:08 +0100
commit9e18d7a67fa6be84d14fc72deaf00bb6b28d8b7e (patch)
treefbdcf7b42f11d83d9547c751eff6ef72c3b84511 /target/arm
parentd1822297f63b68c1fd8c5282b753d00c95701dd8 (diff)
target/arm: Implement SVE predicate test
Reviewed-by: Peter Maydell <peter.maydell@linaro.org> Signed-off-by: Richard Henderson <richard.henderson@linaro.org> Message-id: 20180516223007.10256-6-richard.henderson@linaro.org Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Diffstat (limited to 'target/arm')
-rw-r--r--target/arm/Makefile.objs2
-rw-r--r--target/arm/helper-sve.h21
-rw-r--r--target/arm/helper.h1
-rw-r--r--target/arm/sve.decode5
-rw-r--r--target/arm/sve_helper.c78
-rw-r--r--target/arm/translate-sve.c65
6 files changed, 171 insertions, 1 deletions
diff --git a/target/arm/Makefile.objs b/target/arm/Makefile.objs
index a6f733eaa8..11c7baf8a3 100644
--- a/target/arm/Makefile.objs
+++ b/target/arm/Makefile.objs
@@ -19,4 +19,4 @@ target/arm/decode-sve.inc.c: $(SRC_PATH)/target/arm/sve.decode $(DECODETREE)
"GEN", $(TARGET_DIR)$@)
target/arm/translate-sve.o: target/arm/decode-sve.inc.c
-obj-$(TARGET_AARCH64) += translate-sve.o
+obj-$(TARGET_AARCH64) += translate-sve.o sve_helper.o
diff --git a/target/arm/helper-sve.h b/target/arm/helper-sve.h
new file mode 100644
index 0000000000..b6e91539ae
--- /dev/null
+++ b/target/arm/helper-sve.h
@@ -0,0 +1,21 @@
+/*
+ * AArch64 SVE specific helper definitions
+ *
+ * Copyright (c) 2018 Linaro, Ltd
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, see <http://www.gnu.org/licenses/>.
+ */
+
+DEF_HELPER_FLAGS_2(sve_predtest1, TCG_CALL_NO_WG, i32, i64, i64)
+DEF_HELPER_FLAGS_3(sve_predtest, TCG_CALL_NO_WG, i32, ptr, ptr, i32)
diff --git a/target/arm/helper.h b/target/arm/helper.h
index 047f3bc1ca..0c6a144458 100644
--- a/target/arm/helper.h
+++ b/target/arm/helper.h
@@ -603,4 +603,5 @@ DEF_HELPER_FLAGS_5(gvec_fcmlad, TCG_CALL_NO_RWG,
#ifdef TARGET_AARCH64
#include "helper-a64.h"
+#include "helper-sve.h"
#endif
diff --git a/target/arm/sve.decode b/target/arm/sve.decode
index a2c4450e7c..a44ca2f551 100644
--- a/target/arm/sve.decode
+++ b/target/arm/sve.decode
@@ -56,6 +56,11 @@ ORR_zzz 00000100 01 1 ..... 001 100 ..... ..... @rd_rn_rm_e0
EOR_zzz 00000100 10 1 ..... 001 100 ..... ..... @rd_rn_rm_e0
BIC_zzz 00000100 11 1 ..... 001 100 ..... ..... @rd_rn_rm_e0
+### SVE Predicate Misc Group
+
+# SVE predicate test
+PTEST 00100101 01 010000 11 pg:4 0 rn:4 0 0000
+
### SVE Memory - 32-bit Gather and Unsized Contiguous Group
# SVE load predicate register
diff --git a/target/arm/sve_helper.c b/target/arm/sve_helper.c
new file mode 100644
index 0000000000..1ebb67e1df
--- /dev/null
+++ b/target/arm/sve_helper.c
@@ -0,0 +1,78 @@
+/*
+ * ARM SVE Operations
+ *
+ * Copyright (c) 2018 Linaro, Ltd.
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "qemu/osdep.h"
+#include "cpu.h"
+#include "exec/exec-all.h"
+#include "exec/cpu_ldst.h"
+#include "exec/helper-proto.h"
+#include "tcg/tcg-gvec-desc.h"
+
+
+/* Return a value for NZCV as per the ARM PredTest pseudofunction.
+ *
+ * The return value has bit 31 set if N is set, bit 1 set if Z is clear,
+ * and bit 0 set if C is set. Compare the definitions of these variables
+ * within CPUARMState.
+ */
+
+/* For no G bits set, NZCV = C. */
+#define PREDTEST_INIT 1
+
+/* This is an iterative function, called for each Pd and Pg word
+ * moving forward.
+ */
+static uint32_t iter_predtest_fwd(uint64_t d, uint64_t g, uint32_t flags)
+{
+ if (likely(g)) {
+ /* Compute N from first D & G.
+ Use bit 2 to signal first G bit seen. */
+ if (!(flags & 4)) {
+ flags |= ((d & (g & -g)) != 0) << 31;
+ flags |= 4;
+ }
+
+ /* Accumulate Z from each D & G. */
+ flags |= ((d & g) != 0) << 1;
+
+ /* Compute C from last !(D & G). Replace previous. */
+ flags = deposit32(flags, 0, 1, (d & pow2floor(g)) == 0);
+ }
+ return flags;
+}
+
+/* The same for a single word predicate. */
+uint32_t HELPER(sve_predtest1)(uint64_t d, uint64_t g)
+{
+ return iter_predtest_fwd(d, g, PREDTEST_INIT);
+}
+
+/* The same for a multi-word predicate. */
+uint32_t HELPER(sve_predtest)(void *vd, void *vg, uint32_t words)
+{
+ uint32_t flags = PREDTEST_INIT;
+ uint64_t *d = vd, *g = vg;
+ uintptr_t i = 0;
+
+ do {
+ flags = iter_predtest_fwd(d[i], g[i], flags);
+ } while (++i < words);
+
+ return flags;
+}
diff --git a/target/arm/translate-sve.c b/target/arm/translate-sve.c
index 5ec18a6aac..c3f1b0bfa6 100644
--- a/target/arm/translate-sve.c
+++ b/target/arm/translate-sve.c
@@ -87,6 +87,43 @@ static bool do_mov_z(DisasContext *s, int rd, int rn)
return do_vector2_z(s, tcg_gen_gvec_mov, 0, rd, rn);
}
+/* Set the cpu flags as per a return from an SVE helper. */
+static void do_pred_flags(TCGv_i32 t)
+{
+ tcg_gen_mov_i32(cpu_NF, t);
+ tcg_gen_andi_i32(cpu_ZF, t, 2);
+ tcg_gen_andi_i32(cpu_CF, t, 1);
+ tcg_gen_movi_i32(cpu_VF, 0);
+}
+
+/* Subroutines computing the ARM PredTest psuedofunction. */
+static void do_predtest1(TCGv_i64 d, TCGv_i64 g)
+{
+ TCGv_i32 t = tcg_temp_new_i32();
+
+ gen_helper_sve_predtest1(t, d, g);
+ do_pred_flags(t);
+ tcg_temp_free_i32(t);
+}
+
+static void do_predtest(DisasContext *s, int dofs, int gofs, int words)
+{
+ TCGv_ptr dptr = tcg_temp_new_ptr();
+ TCGv_ptr gptr = tcg_temp_new_ptr();
+ TCGv_i32 t;
+
+ tcg_gen_addi_ptr(dptr, cpu_env, dofs);
+ tcg_gen_addi_ptr(gptr, cpu_env, gofs);
+ t = tcg_const_i32(words);
+
+ gen_helper_sve_predtest(t, dptr, gptr, t);
+ tcg_temp_free_ptr(dptr);
+ tcg_temp_free_ptr(gptr);
+
+ do_pred_flags(t);
+ tcg_temp_free_i32(t);
+}
+
/*
*** SVE Logical - Unpredicated Group
*/
@@ -116,6 +153,34 @@ static bool trans_BIC_zzz(DisasContext *s, arg_rrr_esz *a, uint32_t insn)
}
/*
+ *** SVE Predicate Misc Group
+ */
+
+static bool trans_PTEST(DisasContext *s, arg_PTEST *a, uint32_t insn)
+{
+ if (sve_access_check(s)) {
+ int nofs = pred_full_reg_offset(s, a->rn);
+ int gofs = pred_full_reg_offset(s, a->pg);
+ int words = DIV_ROUND_UP(pred_full_reg_size(s), 8);
+
+ if (words == 1) {
+ TCGv_i64 pn = tcg_temp_new_i64();
+ TCGv_i64 pg = tcg_temp_new_i64();
+
+ tcg_gen_ld_i64(pn, cpu_env, nofs);
+ tcg_gen_ld_i64(pg, cpu_env, gofs);
+ do_predtest1(pn, pg);
+
+ tcg_temp_free_i64(pn);
+ tcg_temp_free_i64(pg);
+ } else {
+ do_predtest(s, nofs, gofs, words);
+ }
+ }
+ return true;
+}
+
+/*
*** SVE Memory - 32-bit Gather and Unsized Contiguous Group
*/