[Qemu-devel] [PATCH v5 02/16] tcg/ppc: Introduce flag have_isa_altivec

[Aleksandar Markovic <aleksandar.markovic@rt-rk.com>]

From: Richard Henderson <richard.henderson@linaro.org>

Detect during initialization if the emulated CPU supports Altivec,
and store the result in the flag have_isa_altivec. The definition
of Altivec SIMD instructions set evolved over time. Different
generations of Altivec will be distinguished by other flags in TCG,
and they are currently have_isa_2_06 and have_isa_3_00.

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Aleksandar Markovic <amarkovic@wavecomp.com>
---
 tcg/ppc/tcg-target.h     | 25 +++++++++++++++++++++++++
 tcg/ppc/tcg-target.inc.c |  8 ++++++++
 2 files changed, 33 insertions(+)

diff --git a/tcg/ppc/tcg-target.h b/tcg/ppc/tcg-target.h
index 690fa74..f6283f4 100644
--- a/tcg/ppc/tcg-target.h
+++ b/tcg/ppc/tcg-target.h
@@ -58,6 +58,7 @@ typedef enum {
     TCG_AREG0 = TCG_REG_R27
 } TCGReg;
 
+extern bool have_isa_altivec;
 extern bool have_isa_2_06;
 extern bool have_isa_3_00;
 
@@ -135,6 +136,30 @@ extern bool have_isa_3_00;
 #define TCG_TARGET_HAS_mulsh_i64        1
 #endif
 
+/*
+ * While technically Altivec could support V64, it has no 64-bit store
+ * instruction and substituting two 32-bit stores makes the generated
+ * code quite large.
+ */
+#define TCG_TARGET_HAS_v64              0
+#define TCG_TARGET_HAS_v128             have_isa_altivec
+#define TCG_TARGET_HAS_v256             0
+
+#define TCG_TARGET_HAS_andc_vec         0
+#define TCG_TARGET_HAS_orc_vec          0
+#define TCG_TARGET_HAS_not_vec          0
+#define TCG_TARGET_HAS_neg_vec          0
+#define TCG_TARGET_HAS_abs_vec          0
+#define TCG_TARGET_HAS_shi_vec          0
+#define TCG_TARGET_HAS_shs_vec          0
+#define TCG_TARGET_HAS_shv_vec          0
+#define TCG_TARGET_HAS_cmp_vec          0
+#define TCG_TARGET_HAS_mul_vec          0
+#define TCG_TARGET_HAS_sat_vec          0
+#define TCG_TARGET_HAS_minmax_vec       0
+#define TCG_TARGET_HAS_bitsel_vec       0
+#define TCG_TARGET_HAS_cmpsel_vec       0
+
 void flush_icache_range(uintptr_t start, uintptr_t stop);
 void tb_target_set_jmp_target(uintptr_t, uintptr_t, uintptr_t);
 
diff --git a/tcg/ppc/tcg-target.inc.c b/tcg/ppc/tcg-target.inc.c
index 8e1bba7..26892de 100644
--- a/tcg/ppc/tcg-target.inc.c
+++ b/tcg/ppc/tcg-target.inc.c
@@ -64,6 +64,7 @@
 
 static tcg_insn_unit *tb_ret_addr;
 
+bool have_isa_altivec;
 bool have_isa_2_06;
 bool have_isa_3_00;
 
@@ -2781,6 +2782,9 @@ static void tcg_target_init(TCGContext *s)
     unsigned long hwcap = qemu_getauxval(AT_HWCAP);
     unsigned long hwcap2 = qemu_getauxval(AT_HWCAP2);
 
+    if (hwcap & PPC_FEATURE_HAS_ALTIVEC) {
+        have_isa_altivec = true;
+    }
     if (hwcap & PPC_FEATURE_ARCH_2_06) {
         have_isa_2_06 = true;
     }
@@ -2792,6 +2796,10 @@ static void tcg_target_init(TCGContext *s)
 
     tcg_target_available_regs[TCG_TYPE_I32] = 0xffffffff;
     tcg_target_available_regs[TCG_TYPE_I64] = 0xffffffff;
+    if (have_isa_altivec) {
+        tcg_target_available_regs[TCG_TYPE_V64] = 0xffffffff00000000ull;
+        tcg_target_available_regs[TCG_TYPE_V128] = 0xffffffff00000000ull;
+    }
 
     tcg_target_call_clobber_regs = 0;
     tcg_regset_set_reg(tcg_target_call_clobber_regs, TCG_REG_R0);
-- 
2.7.4