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FSCALE should always return 0.0 if ST(0) input is 0.0, regardless of

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value of ST(1); this might otherwise return infinity or NaN if not
trapped. Fixes fade-in on MDK2.
This commit is contained in:
SarahW 2021-06-02 21:13:39 +01:00
commit 2e037b5076
1 changed files with 2 additions and 1 deletions
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3
src/x87_ops_misc.h
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@ -673,7 +673,8 @@ static int opFSCALE(uint32_t fetchdat)
cpu_state.pc++; cpu_state.pc++;
if (fplog) pclog("FSCALE\n"); if (fplog) pclog("FSCALE\n");
temp64 = (int64_t)ST(1); temp64 = (int64_t)ST(1);
ST(0) = ST(0) * pow(2.0, (double)temp64); if (ST(0) != 0.0)
ST(0) = ST(0) * pow(2.0, (double)temp64);
cpu_state.tag[cpu_state.TOP&7] = TAG_VALID; cpu_state.tag[cpu_state.TOP&7] = TAG_VALID;
CLOCK_CYCLES(x87_timings.fscale); CLOCK_CYCLES(x87_timings.fscale);
return 0; return 0;