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PDP11: Move history entry pointer initialization out of instruction loop.

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This will be slightly more efficient for the normal case where history isn't
being recorded.
This commit is contained in:
Mark Pizzolato 2016-08-25 14:27:02 -07:00
parent 66fb70b768
commit 0352e0fd7b
1 changed files with 1 additions and 2 deletions
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3
PDP11/pdp11_cpu.c
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@ -665,6 +665,7 @@ t_stat sim_instr (void)
int abortval, i; int abortval, i;
volatile int32 trapea; /* used by setjmp */ volatile int32 trapea; /* used by setjmp */
t_stat reason; t_stat reason;
InstHistory *hst_ent = NULL;
sim_vm_pc_value = &pdp11_pc_value; sim_vm_pc_value = &pdp11_pc_value;
@ -745,7 +746,6 @@ while (reason == 0) {
int32 IR, srcspec, srcreg, dstspec, dstreg; int32 IR, srcspec, srcreg, dstspec, dstreg;
int32 src, src2, dst, ea; int32 src, src2, dst, ea;
int32 i, t, sign, oldrs, trapnum; int32 i, t, sign, oldrs, trapnum;
InstHistory *hst_ent;
if (cpu_astop) { if (cpu_astop) {
cpu_astop = 0; cpu_astop = 0;
@ -902,7 +902,6 @@ while (reason == 0) {
if (hst_p >= hst_lnt) if (hst_p >= hst_lnt)
hst_p = 0; hst_p = 0;
} }
else hst_ent = NULL;
PC = (PC + 2) & 0177777; /* incr PC, mod 65k */ PC = (PC + 2) & 0177777; /* incr PC, mod 65k */
switch ((IR >> 12) & 017) { /* decode IR<15:12> */ switch ((IR >> 12) & 017) { /* decode IR<15:12> */