target/tricore: Fix RCPW/RRPW_INSERT insns for width = 0

we would crash if width was 0 for these insns, as tcg_gen_deposit() is
undefined for that case. For TriCore, width = 0 is a mov from the src reg
to the dst reg, so we special case this here.

Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Bastian Koppelmann <kbastian@mail.uni-paderborn.de>
Message-ID: <20230828112651.522058-9-kbastian@mail.uni-paderborn.de>

target/tricore/translate.c

@@ -5310,8 +5310,11 @@ static void decode_rcpw_insert(DisasContext *ctx)
         }
         break;
     case OPC2_32_RCPW_INSERT:
+        /* tcg_gen_deposit_tl() does not handle the case of width = 0 */
+        if (width == 0) {
+            tcg_gen_mov_tl(cpu_gpr_d[r2], cpu_gpr_d[r1]);
         /* if pos + width > 32 undefined result */
-        if (pos + width <= 32) {
+        } else if (pos + width <= 32) {
             temp = tcg_constant_i32(const4);
             tcg_gen_deposit_tl(cpu_gpr_d[r2], cpu_gpr_d[r1], temp, pos, width);
         }
@@ -6571,7 +6574,10 @@ static void decode_rrpw_extract_insert(DisasContext *ctx)
 
         break;
     case OPC2_32_RRPW_INSERT:
-        if (pos + width <= 32) {
+        /* tcg_gen_deposit_tl() does not handle the case of width = 0 */
+        if (width == 0) {
+            tcg_gen_mov_tl(cpu_gpr_d[r3], cpu_gpr_d[r1]);
+        } else if (pos + width <= 32) {
             tcg_gen_deposit_tl(cpu_gpr_d[r3], cpu_gpr_d[r1], cpu_gpr_d[r2],
                                pos, width);
         }

tests/tcg/tricore/asm/macros.h

@@ -161,6 +161,21 @@ test_ ## num:                                                    \
     insn DREG_CALC_RESULT, DREG_RS1, imm1, DREG_RS2, imm2;   \
     )
 
+#define TEST_D_DDII(insn, num, result, rs1, rs2, imm1, imm2) \
+    TEST_CASE(num, DREG_CALC_RESULT, result,                 \
+    LI(DREG_RS1, rs1);                                       \
+    LI(DREG_RS2, rs2);                                       \
+    rstv;                                                    \
+    insn DREG_CALC_RESULT, DREG_RS1, DREG_RS2, imm1, imm2;   \
+    )
+
+#define TEST_D_DIII(insn, num, result, rs1, imm1, imm2, imm3)\
+    TEST_CASE(num, DREG_CALC_RESULT, result,                 \
+    LI(DREG_RS1, rs1);                                       \
+    rstv;                                                    \
+    insn DREG_CALC_RESULT, DREG_RS1, imm1, imm2, imm3;       \
+    )
+
 #define TEST_E_ED(insn, num, res_hi, res_lo, rs1_hi, rs1_lo, rs2) \
     TEST_CASE_E(num, res_lo, res_hi,                              \
     LI(EREG_RS1_LO, rs1_lo);                                      \

tests/tcg/tricore/asm/test_insert.S

@@ -6,4 +6,13 @@ _start:
 #                 |     |      |            |       |     |    |
     TEST_D_DIDI(insert, 1, 0x7fffffff, 0xffffffff, 0xa, 0x10, 0x8)
 
+#                insn num    result        rs1    imm1   imm2 imm3
+#                 |     |      |            |       |     |    |
+    TEST_D_DIII(insert, 2, 0xd38fe370, 0xd38fe370, 0x4, 0x4 , 0x0)
+    TEST_D_DIII(insert, 3, 0xd38fe374, 0xd38fe370, 0x4, 0x0 , 0x4)
+
+#                insn  num   result       rs1         rs2      pos  width
+#                 |     |      |           |           |        |    |
+    TEST_D_DDII(insert, 4, 0x03c1e53c, 0x03c1e53c, 0x45821385, 0x7 ,0x0)
+
     TEST_PASSFAIL