[PATCH 04/41] target/sparc: Fix FMUL8x16A{U,L}

From: Richard Henderson <richard.henderson@linaro.org>
To: qemu-devel@nongnu.org
Cc: mark.cave-ayland@ilande.co.uk, atar4qemu@gmail.com
Subject: [PATCH 04/41] target/sparc: Fix FMUL8x16A{U,L}
Date: Fri,  1 Mar 2024 19:15:24 -1000	[thread overview]
Message-ID: <20240302051601.53649-5-richard.henderson@linaro.org> (raw)
In-Reply-To: <20240302051601.53649-1-richard.henderson@linaro.org>

These instructions have f32 inputs, which changes the decode
of the register numbers.  While we're fixing things, use a
common helper for both insns, extracting the 16-bit scalar
in tcg beforehand.

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
---
 target/sparc/helper.h     |  3 +--
 target/sparc/translate.c  | 38 ++++++++++++++++++++++++++++++----
 target/sparc/vis_helper.c | 43 +++++++++------------------------------
 3 files changed, 45 insertions(+), 39 deletions(-)

diff --git a/target/sparc/helper.h b/target/sparc/helper.h
index adc1b87319..9e0b8b463e 100644
--- a/target/sparc/helper.h
+++ b/target/sparc/helper.h
@@ -93,8 +93,7 @@ DEF_HELPER_FLAGS_2(fqtox, TCG_CALL_NO_WG, s64, env, i128)
 
 DEF_HELPER_FLAGS_2(fpmerge, TCG_CALL_NO_RWG_SE, i64, i64, i64)
 DEF_HELPER_FLAGS_2(fmul8x16, TCG_CALL_NO_RWG_SE, i64, i32, i64)
-DEF_HELPER_FLAGS_2(fmul8x16al, TCG_CALL_NO_RWG_SE, i64, i64, i64)
-DEF_HELPER_FLAGS_2(fmul8x16au, TCG_CALL_NO_RWG_SE, i64, i64, i64)
+DEF_HELPER_FLAGS_2(fmul8x16a, TCG_CALL_NO_RWG_SE, i64, i32, s32)
 DEF_HELPER_FLAGS_2(fmul8sux16, TCG_CALL_NO_RWG_SE, i64, i64, i64)
 DEF_HELPER_FLAGS_2(fmul8ulx16, TCG_CALL_NO_RWG_SE, i64, i64, i64)
 DEF_HELPER_FLAGS_2(fmuld8sux16, TCG_CALL_NO_RWG_SE, i64, i64, i64)
diff --git a/target/sparc/translate.c b/target/sparc/translate.c
index 5144fe4ed9..598cfcf0ac 100644
--- a/target/sparc/translate.c
+++ b/target/sparc/translate.c
@@ -45,6 +45,7 @@
 # define gen_helper_clear_softint(E, S)         qemu_build_not_reached()
 # define gen_helper_done(E)                     qemu_build_not_reached()
 # define gen_helper_flushw(E)                   qemu_build_not_reached()
+# define gen_helper_fmul8x16a(D, S1, S2)        qemu_build_not_reached()
 # define gen_helper_rdccr(D, E)                 qemu_build_not_reached()
 # define gen_helper_rdcwp(D, E)                 qemu_build_not_reached()
 # define gen_helper_restored(E)                 qemu_build_not_reached()
@@ -72,8 +73,6 @@
 # define gen_helper_fexpand              ({ qemu_build_not_reached(); NULL; })
 # define gen_helper_fmul8sux16           ({ qemu_build_not_reached(); NULL; })
 # define gen_helper_fmul8ulx16           ({ qemu_build_not_reached(); NULL; })
-# define gen_helper_fmul8x16al           ({ qemu_build_not_reached(); NULL; })
-# define gen_helper_fmul8x16au           ({ qemu_build_not_reached(); NULL; })
 # define gen_helper_fmul8x16             ({ qemu_build_not_reached(); NULL; })
 # define gen_helper_fmuld8sux16          ({ qemu_build_not_reached(); NULL; })
 # define gen_helper_fmuld8ulx16          ({ qemu_build_not_reached(); NULL; })
@@ -719,6 +718,18 @@ static void gen_op_bshuffle(TCGv_i64 dst, TCGv_i64 src1, TCGv_i64 src2)
 #endif
 }
 
+static void gen_op_fmul8x16al(TCGv_i64 dst, TCGv_i32 src1, TCGv_i32 src2)
+{
+    tcg_gen_ext16s_i32(src2, src2);
+    gen_helper_fmul8x16a(dst, src1, src2);
+}
+
+static void gen_op_fmul8x16au(TCGv_i64 dst, TCGv_i32 src1, TCGv_i32 src2)
+{
+    tcg_gen_sari_i32(src2, src2, 16);
+    gen_helper_fmul8x16a(dst, src1, src2);
+}
+
 static void finishing_insn(DisasContext *dc)
 {
     /*
@@ -4539,6 +4550,27 @@ TRANS(FSUBs, ALL, do_env_fff, a, gen_helper_fsubs)
 TRANS(FMULs, ALL, do_env_fff, a, gen_helper_fmuls)
 TRANS(FDIVs, ALL, do_env_fff, a, gen_helper_fdivs)
 
+static bool do_dff(DisasContext *dc, arg_r_r_r *a,
+                   void (*func)(TCGv_i64, TCGv_i32, TCGv_i32))
+{
+    TCGv_i64 dst;
+    TCGv_i32 src1, src2;
+
+    if (gen_trap_ifnofpu(dc)) {
+        return true;
+    }
+
+    dst = gen_dest_fpr_D(dc, a->rd);
+    src1 = gen_load_fpr_F(dc, a->rs1);
+    src2 = gen_load_fpr_F(dc, a->rs2);
+    func(dst, src1, src2);
+    gen_store_fpr_D(dc, a->rd, dst);
+    return advance_pc(dc);
+}
+
+TRANS(FMUL8x16AU, VIS1, do_dff, a, gen_op_fmul8x16au)
+TRANS(FMUL8x16AL, VIS1, do_dff, a, gen_op_fmul8x16al)
+
 static bool do_dfd(DisasContext *dc, arg_r_r_r *a,
                    void (*func)(TCGv_i64, TCGv_i32, TCGv_i64))
 {
@@ -4576,8 +4608,6 @@ static bool do_ddd(DisasContext *dc, arg_r_r_r *a,
     return advance_pc(dc);
 }
 
-TRANS(FMUL8x16AU, VIS1, do_ddd, a, gen_helper_fmul8x16au)
-TRANS(FMUL8x16AL, VIS1, do_ddd, a, gen_helper_fmul8x16al)
 TRANS(FMUL8SUx16, VIS1, do_ddd, a, gen_helper_fmul8sux16)
 TRANS(FMUL8ULx16, VIS1, do_ddd, a, gen_helper_fmul8ulx16)
 TRANS(FMULD8SUx16, VIS1, do_ddd, a, gen_helper_fmuld8sux16)
diff --git a/target/sparc/vis_helper.c b/target/sparc/vis_helper.c
index 7728ffe9c6..5c7f5536bc 100644
--- a/target/sparc/vis_helper.c
+++ b/target/sparc/vis_helper.c
@@ -119,43 +119,20 @@ uint64_t helper_fmul8x16(uint32_t src1, uint64_t src2)
     return d.ll;
 }
 
-uint64_t helper_fmul8x16al(uint64_t src1, uint64_t src2)
+uint64_t helper_fmul8x16a(uint32_t src1, int32_t src2)
 {
-    VIS64 s, d;
+    VIS32 s;
+    VIS64 d;
     uint32_t tmp;
 
-    s.ll = src1;
-    d.ll = src2;
+    s.l = src1;
+    d.ll = 0;
 
-#define PMUL(r)                                                 \
-    tmp = (int32_t)d.VIS_SW64(1) * (int32_t)s.VIS_B64(r);       \
-    if ((tmp & 0xff) > 0x7f) {                                  \
-        tmp += 0x100;                                           \
-    }                                                           \
-    d.VIS_W64(r) = tmp >> 8;
-
-    PMUL(0);
-    PMUL(1);
-    PMUL(2);
-    PMUL(3);
-#undef PMUL
-
-    return d.ll;
-}
-
-uint64_t helper_fmul8x16au(uint64_t src1, uint64_t src2)
-{
-    VIS64 s, d;
-    uint32_t tmp;
-
-    s.ll = src1;
-    d.ll = src2;
-
-#define PMUL(r)                                                 \
-    tmp = (int32_t)d.VIS_SW64(0) * (int32_t)s.VIS_B64(r);       \
-    if ((tmp & 0xff) > 0x7f) {                                  \
-        tmp += 0x100;                                           \
-    }                                                           \
+#define PMUL(r)                                \
+    tmp = src2 * (int32_t)s.VIS_B64(r);        \
+    if ((tmp & 0xff) > 0x7f) {                 \
+        tmp += 0x100;                          \
+    }                                          \
     d.VIS_W64(r) = tmp >> 8;
 
     PMUL(0);
-- 
2.34.1


