Handle overflow from signed divide by -1.
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parent
6546a590b4
commit
9204a35e78
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@ -3488,18 +3488,37 @@ build_instruction (doisa, features, mips16, insn)
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{
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char hi = (i == 0 ? ' ' : '1');
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int d = i * 2;
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if (! (insn->flags & UNSIGNED))
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{
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printf("if (RT_SW(%d) == -1)\n", d );
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printf(" {\n");
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printf(" LO%c = -RS_%sW(%d);\n", hi, sign, d );
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printf(" HI%c = 0;\n", hi );
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printf(" }\nelse ");
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};
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printf("if (RT_UW(%d) != 0)\n", d );
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printf(" {\n");
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printf("LO%c = (signed32)(RS_%sW(%d) / RT_%sW(%d));\n", hi, sign, d, sign, d );
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printf("HI%c = (signed32)(RS_%sW(%d) %% RT_%sW(%d));\n", hi, sign, d, sign, d );
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printf(" }\n");
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printf(" {\n");
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printf(" LO%c = (signed32)(RS_%sW(%d) / RT_%sW(%d));\n", hi, sign, d, sign, d );
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printf(" HI%c = (signed32)(RS_%sW(%d) %% RT_%sW(%d));\n", hi, sign, d, sign, d );
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printf(" }\n");
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}
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break;
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}
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case PDIVBW:
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printf("signed32 devisor = RT_SH(0);\n");
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printf("if (devisor != 0)\n");
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printf("if (devisor == -1)\n");
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printf(" {\n");
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printf(" LO_SW(0) = -RS_SW(0);\n");
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printf(" HI_SW(0) = 0;\n");
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printf(" LO_SW(1) = -RS_SW(1);\n");
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printf(" HI_SW(1) = 0;\n");
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printf(" LO_SW(2) = -RS_SW(2);\n");
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printf(" HI_SW(2) = 0;\n");
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printf(" LO_SW(3) = -RS_SW(3);\n");
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printf(" HI_SW(3) = 0;\n");
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printf(" }\n");
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printf("else if (devisor != 0)\n");
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printf(" {\n");
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printf(" LO_SW(0) = RS_SW(0) / devisor;\n");
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printf(" HI_SW(0) = SIGNEXTEND( (RS_SW(0) %% devisor), 16 );\n");
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