[PATCH 07/23] i386: check SSE table flags instead of hardcoding opcodes

[Paolo Bonzini <pbonzini@redhat.com>]

Put more flags to work to avoid hardcoding lists of opcodes.  The op7 case
for SSE_OPF_CMP is included for homogeneity and because AVX needs it, but
it is never used by SSE or MMX.

Extracted from a patch by Paul Brook <paul@nowt.org>.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
---
 target/i386/tcg/translate.c | 75 +++++++++++++++----------------------
 1 file changed, 31 insertions(+), 44 deletions(-)

diff --git a/target/i386/tcg/translate.c b/target/i386/tcg/translate.c
index c76f6dba11..849c40b685 100644
--- a/target/i386/tcg/translate.c
+++ b/target/i386/tcg/translate.c
@@ -3909,7 +3909,7 @@ static void gen_sse(CPUX86State *env, DisasContext *s, int b,
             tcg_gen_addi_ptr(s->ptr1, cpu_env, op2_offset);
             op6->op[b1](cpu_env, s->ptr0, s->ptr1);
 
-            if (b == 0x17) {
+            if (op6->flags & SSE_OPF_CMP) {
                 set_cc_op(s, CC_OP_EFLAGS);
             }
             break;
@@ -4463,6 +4463,9 @@ static void gen_sse(CPUX86State *env, DisasContext *s, int b,
             tcg_gen_addi_ptr(s->ptr0, cpu_env, op1_offset);
             tcg_gen_addi_ptr(s->ptr1, cpu_env, op2_offset);
             op7->op[b1](cpu_env, s->ptr0, s->ptr1, tcg_const_i32(val));
+            if (op7->flags & SSE_OPF_CMP) {
+                set_cc_op(s, CC_OP_EFLAGS);
+            }
             break;
 
         case 0x33a:
@@ -4518,28 +4521,24 @@ static void gen_sse(CPUX86State *env, DisasContext *s, int b,
                 int sz = 4;
 
                 gen_lea_modrm(env, s, modrm);
-                op2_offset = offsetof(CPUX86State,xmm_t0);
+                op2_offset = offsetof(CPUX86State, xmm_t0);
 
-                switch (b) {
-                case 0x50 ... 0x5a:
-                case 0x5c ... 0x5f:
-                case 0xc2:
-                    /* Most sse scalar operations.  */
-                    if (b1 == 2) {
-                        sz = 2;
-                    } else if (b1 == 3) {
-                        sz = 3;
-                    }
-                    break;
-
-                case 0x2e:  /* ucomis[sd] */
-                case 0x2f:  /* comis[sd] */
-                    if (b1 == 0) {
-                        sz = 2;
+                if (sse_op_flags & SSE_OPF_SCALAR) {
+                    if (sse_op_flags & SSE_OPF_CMP) {
+                        /* ucomis[sd], comis[sd] */
+                        if (b1 == 0) {
+                            sz = 2;
+                        } else {
+                            sz = 3;
+                        }
                     } else {
-                        sz = 3;
+                        /* Most sse scalar operations.  */
+                        if (b1 == 2) {
+                            sz = 2;
+                        } else if (b1 == 3) {
+                            sz = 3;
+                        }
                     }
-                    break;
                 }
 
                 switch (sz) {
@@ -4585,26 +4584,14 @@ static void gen_sse(CPUX86State *env, DisasContext *s, int b,
                 return;
             }
         }
-        switch(b) {
-        case 0x70: /* pshufx insn */
-        case 0xc6: /* pshufx insn */
+        tcg_gen_addi_ptr(s->ptr0, cpu_env, op1_offset);
+        tcg_gen_addi_ptr(s->ptr1, cpu_env, op2_offset);
+        if (sse_op_flags & SSE_OPF_SHUF) {
             val = x86_ldub_code(env, s);
-            tcg_gen_addi_ptr(s->ptr0, cpu_env, op1_offset);
-            tcg_gen_addi_ptr(s->ptr1, cpu_env, op2_offset);
             /* XXX: introduce a new table? */
             sse_fn_ppi = (SSEFunc_0_ppi)sse_fn_epp;
             sse_fn_ppi(s->ptr0, s->ptr1, tcg_const_i32(val));
-            break;
-        case 0xc2:
-            /* compare insns, bits 7:3 (7:5 for AVX) are ignored */
-            val = x86_ldub_code(env, s) & 7;
-            sse_fn_epp = sse_op_table4[val][b1];
-
-            tcg_gen_addi_ptr(s->ptr0, cpu_env, op1_offset);
-            tcg_gen_addi_ptr(s->ptr1, cpu_env, op2_offset);
-            sse_fn_epp(cpu_env, s->ptr0, s->ptr1);
-            break;
-        case 0xf7:
+        } else if (b == 0xf7) {
             /* maskmov : we must prepare A0 */
             if (mod != 3) {
                 goto illegal_op;
@@ -4613,19 +4600,19 @@ static void gen_sse(CPUX86State *env, DisasContext *s, int b,
             gen_extu(s->aflag, s->A0);
             gen_add_A0_ds_seg(s);
 
-            tcg_gen_addi_ptr(s->ptr0, cpu_env, op1_offset);
-            tcg_gen_addi_ptr(s->ptr1, cpu_env, op2_offset);
             /* XXX: introduce a new table? */
             sse_fn_eppt = (SSEFunc_0_eppt)sse_fn_epp;
             sse_fn_eppt(cpu_env, s->ptr0, s->ptr1, s->A0);
-            break;
-        default:
-            tcg_gen_addi_ptr(s->ptr0, cpu_env, op1_offset);
-            tcg_gen_addi_ptr(s->ptr1, cpu_env, op2_offset);
+        } else if (b == 0xc2) {
+            /* compare insns, bits 7:3 (7:5 for AVX) are ignored */
+            val = x86_ldub_code(env, s) & 7;
+            sse_fn_epp = sse_op_table4[val][b1];
+            sse_fn_epp(cpu_env, s->ptr0, s->ptr1);
+        } else {
             sse_fn_epp(cpu_env, s->ptr0, s->ptr1);
-            break;
         }
-        if (b == 0x2e || b == 0x2f) {
+
+        if (sse_op_flags & SSE_OPF_CMP) {
             set_cc_op(s, CC_OP_EFLAGS);
         }
     }
-- 
2.37.1