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Hexagon (target/hexagon) decide if pred has been written at TCG gen time

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Multiple writes to the same preg are and'ed together.  Rather than
generating a runtime check, we can determine at TCG generation time
if the predicate has previously been written in the packet.

Test added to tests/tcg/hexagon/misc.c

Suggested-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Taylor Simpson <tsimpson@quicinc.com>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <1617930474-31979-7-git-send-email-tsimpson@quicinc.com>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
This commit is contained in:
Taylor Simpson 2021-04-08 20:07:34 -05:00 • committed by Richard Henderson
parent 743debbc37
commit 6c677c60ae
5 changed files with 44 additions and 10 deletions
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9
target/hexagon/translate.c
View file

@ -172,6 +172,7 @@ static void gen_start_packet(DisasContext *ctx, Packet *pkt)
ctx->reg_log_idx = 0;
bitmap_zero(ctx->regs_written, TOTAL_PER_THREAD_REGS);
ctx->preg_log_idx = 0;
bitmap_zero(ctx->pregs_written, NUM_PREGS);
for (i = 0; i < STORES_MAX; i++) {
ctx->store_width[i] = 0;
}
@ -226,7 +227,7 @@ static void mark_implicit_pred_write(DisasContext *ctx, Insn *insn,
}
}
static void mark_implicit_writes(DisasContext *ctx, Insn *insn)
static void mark_implicit_reg_writes(DisasContext *ctx, Insn *insn)
{
mark_implicit_reg_write(ctx, insn, A_IMPLICIT_WRITES_FP, HEX_REG_FP);
mark_implicit_reg_write(ctx, insn, A_IMPLICIT_WRITES_SP, HEX_REG_SP);
@ -235,7 +236,10 @@ static void mark_implicit_writes(DisasContext *ctx, Insn *insn)
mark_implicit_reg_write(ctx, insn, A_IMPLICIT_WRITES_SA0, HEX_REG_SA0);
mark_implicit_reg_write(ctx, insn, A_IMPLICIT_WRITES_LC1, HEX_REG_LC1);
mark_implicit_reg_write(ctx, insn, A_IMPLICIT_WRITES_SA1, HEX_REG_SA1);
}
static void mark_implicit_pred_writes(DisasContext *ctx, Insn *insn)
{
mark_implicit_pred_write(ctx, insn, A_IMPLICIT_WRITES_P0, 0);
mark_implicit_pred_write(ctx, insn, A_IMPLICIT_WRITES_P1, 1);
mark_implicit_pred_write(ctx, insn, A_IMPLICIT_WRITES_P2, 2);
@ -246,8 +250,9 @@ static void gen_insn(CPUHexagonState *env, DisasContext *ctx,
Insn *insn, Packet *pkt)
{
if (insn->generate) {
mark_implicit_writes(ctx, insn);
mark_implicit_reg_writes(ctx, insn);
insn->generate(env, ctx, insn, pkt);
mark_implicit_pred_writes(ctx, insn);
} else {
gen_exception_end_tb(ctx, HEX_EXCP_INVALID_OPCODE);
}