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Handle overflow from signed divide by -1.

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This commit is contained in:
Andrew Cagney
1997-07-28 13:46:53 +00:00
parent 6546a590b4
commit 9204a35e78
1 changed files with 24 additions and 5 deletions
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21
sim/mips/gencode.c
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@ -3488,6 +3488,14 @@ build_instruction (doisa, features, mips16, insn)
{ {
char hi = (i == 0 ? ' ' : '1'); char hi = (i == 0 ? ' ' : '1');
int d = i * 2; int d = i * 2;
if (! (insn->flags & UNSIGNED))
{
printf("if (RT_SW(%d) == -1)\n", d );
printf(" {\n");
printf(" LO%c = -RS_%sW(%d);\n", hi, sign, d );
printf(" HI%c = 0;\n", hi );
printf(" }\nelse ");
};
printf("if (RT_UW(%d) != 0)\n", d ); printf("if (RT_UW(%d) != 0)\n", d );
printf(" {\n"); printf(" {\n");
printf(" LO%c = (signed32)(RS_%sW(%d) / RT_%sW(%d));\n", hi, sign, d, sign, d ); printf(" LO%c = (signed32)(RS_%sW(%d) / RT_%sW(%d));\n", hi, sign, d, sign, d );
@ -3499,7 +3507,18 @@ build_instruction (doisa, features, mips16, insn)
case PDIVBW: case PDIVBW:
printf("signed32 devisor = RT_SH(0);\n"); printf("signed32 devisor = RT_SH(0);\n");
printf("if (devisor != 0)\n"); printf("if (devisor == -1)\n");
printf(" {\n");
printf(" LO_SW(0) = -RS_SW(0);\n");
printf(" HI_SW(0) = 0;\n");
printf(" LO_SW(1) = -RS_SW(1);\n");
printf(" HI_SW(1) = 0;\n");
printf(" LO_SW(2) = -RS_SW(2);\n");
printf(" HI_SW(2) = 0;\n");
printf(" LO_SW(3) = -RS_SW(3);\n");
printf(" HI_SW(3) = 0;\n");
printf(" }\n");
printf("else if (devisor != 0)\n");
printf(" {\n"); printf(" {\n");
printf(" LO_SW(0) = RS_SW(0) / devisor;\n"); printf(" LO_SW(0) = RS_SW(0) / devisor;\n");
printf(" HI_SW(0) = SIGNEXTEND( (RS_SW(0) %% devisor), 16 );\n"); printf(" HI_SW(0) = SIGNEXTEND( (RS_SW(0) %% devisor), 16 );\n");