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make float != 0 tests work on alpha for when the value is actually an integer

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(works fine on intel, but on alpha the denormals either produce an exception
or true zero: not quite desirable:)
This commit is contained in:
Bill Currie 2001-11-19 17:51:31 +00:00
parent 9d0320cc89
commit 8d208ac3aa
1 changed files with 9 additions and 3 deletions
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12
libs/gamecode/engine/pr_exec.c
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@ -248,6 +248,12 @@ PR_LeaveFunction (progs_t * pr)
#define OPB (pr->pr_globals[st->b]) #define OPB (pr->pr_globals[st->b])
#define OPC (pr->pr_globals[st->c]) #define OPC (pr->pr_globals[st->c])
/*
This gets around the problem of needing to test for -0.0 but denormals
causing exceptions (or wrong results for what we need) on the alpha.
*/
#define FNZ(x) ((x).integer_var && (x).integer_var != 0x80000000)
/* /*
PR_ExecuteProgram PR_ExecuteProgram
@ -369,13 +375,13 @@ PR_ExecuteProgram (progs_t * pr, func_t fnum)
OPC.float_var = OPA.float_var < OPB.float_var; OPC.float_var = OPA.float_var < OPB.float_var;
break; break;
case OP_AND: // OPA and OPB have to be float for -0.0 case OP_AND: // OPA and OPB have to be float for -0.0
OPC.integer_var = OPA.float_var && OPB.float_var; OPC.integer_var = FNZ (OPA) && FNZ (OPB);
break; break;
case OP_OR: // OPA and OPB have to be float for -0.0 case OP_OR: // OPA and OPB have to be float for -0.0
OPC.integer_var = OPA.float_var || OPB.float_var; OPC.integer_var = FNZ (OPA) || FNZ (OPB);
break; break;
case OP_NOT_F: case OP_NOT_F:
OPC.integer_var = !OPA.float_var; OPC.integer_var = !FNZ (OPA);
break; break;
case OP_NOT_V: case OP_NOT_V:
OPC.integer_var = VectorIsZero (OPA.vector_var); OPC.integer_var = VectorIsZero (OPA.vector_var);