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| author | Andrew Cagney <cagney@redhat.com> | 1997-07-28 13:46:53 +0000 |
|---|---|---|
| committer | Andrew Cagney <cagney@redhat.com> | 1997-07-28 13:46:53 +0000 |
| commit | 9204a35e78a137f3f30d5ea979da6f3308f1a64e (patch) | |
| tree | a0e951384147d6072cab232dfef432eb863eb37b /sim | |
| parent | 6546a590b45a2473c144b2a855c5949f8198ac68 (diff) | |
| download | gdb-9204a35e78a137f3f30d5ea979da6f3308f1a64e.zip gdb-9204a35e78a137f3f30d5ea979da6f3308f1a64e.tar.gz gdb-9204a35e78a137f3f30d5ea979da6f3308f1a64e.tar.bz2 | |
Handle overflow from signed divide by -1.
Diffstat (limited to 'sim')
| -rw-r--r-- | sim/mips/gencode.c | 29 |
1 files changed, 24 insertions, 5 deletions
diff --git a/sim/mips/gencode.c b/sim/mips/gencode.c index e264b0a..5e4563d 100644 --- a/sim/mips/gencode.c +++ b/sim/mips/gencode.c @@ -3488,18 +3488,37 @@ build_instruction (doisa, features, mips16, insn) { char hi = (i == 0 ? ' ' : '1'); 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(" {\n"); - printf("LO%c = (signed32)(RS_%sW(%d) / RT_%sW(%d));\n", hi, sign, d, sign, d ); - printf("HI%c = (signed32)(RS_%sW(%d) %% RT_%sW(%d));\n", hi, sign, d, sign, d ); - printf(" }\n"); + printf(" {\n"); + printf(" LO%c = (signed32)(RS_%sW(%d) / RT_%sW(%d));\n", hi, sign, d, sign, d ); + printf(" HI%c = (signed32)(RS_%sW(%d) %% RT_%sW(%d));\n", hi, sign, d, sign, d ); + printf(" }\n"); } break; } case PDIVBW: 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(" LO_SW(0) = RS_SW(0) / devisor;\n"); printf(" HI_SW(0) = SIGNEXTEND( (RS_SW(0) %% devisor), 16 );\n"); |