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target-alpha: Update commentary for opcode 0x1A. 

Signed-off-by: Richard Henderson <rth@twiddle.net>
Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
This commit is contained in:
Richard Henderson 2010-03-29 10:48:14 -07:00 committed by Aurelien Jarno
parent 4af7037462
commit 49563a7274
1 changed files with 7 additions and 4 deletions
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11
target-alpha/translate.c
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@ -2531,13 +2531,16 @@ static ExitStatus translate_one(DisasContext *ctx, uint32_t insn)
break; break;
#endif #endif
case 0x1A: case 0x1A:
if (rb != 31) /* JMP, JSR, RET, JSR_COROUTINE. These only differ by the branch
prediction stack action, which of course we don't implement. */
if (rb != 31) {
tcg_gen_andi_i64(cpu_pc, cpu_ir[rb], ~3); tcg_gen_andi_i64(cpu_pc, cpu_ir[rb], ~3);
else } else {
tcg_gen_movi_i64(cpu_pc, 0); tcg_gen_movi_i64(cpu_pc, 0);
if (ra != 31) }
if (ra != 31) {
tcg_gen_movi_i64(cpu_ir[ra], ctx->pc); tcg_gen_movi_i64(cpu_ir[ra], ctx->pc);
/* Those four jumps only differ by the branch prediction hint */ }
ret = EXIT_PC_UPDATED; ret = EXIT_PC_UPDATED;
break; break;
case 0x1B: case 0x1B: