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target/arm: Implement MVE WLSTP insn
Implement the MVE WLSTP insn; this is like the existing WLS insn, except that it specifies a size value which is used to set FPSCR.LTPSIZE. Signed-off-by: Peter Maydell <peter.maydell@linaro.org> Reviewed-by: Richard Henderson <richard.henderson@linaro.org> Message-id: 20210614151007.4545-8-peter.maydell@linaro.org
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@ -672,8 +672,12 @@ BL 1111 0. .......... 11.1 ............ @branch24
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%lob_imm 1:10 11:1 !function=times_2
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%lob_imm 1:10 11:1 !function=times_2
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DLS 1111 0 0000 100 rn:4 1110 0000 0000 0001
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DLS 1111 0 0000 100 rn:4 1110 0000 0000 0001
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WLS 1111 0 0000 100 rn:4 1100 . .......... 1 imm=%lob_imm
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WLS 1111 0 0000 100 rn:4 1100 . .......... 1 imm=%lob_imm size=4
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LE 1111 0 0000 0 f:1 0 1111 1100 . .......... 1 imm=%lob_imm
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{
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LE 1111 0 0000 0 f:1 0 1111 1100 . .......... 1 imm=%lob_imm
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# This is WLSTP
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WLS 1111 0 0000 0 size:2 rn:4 1100 . .......... 1 imm=%lob_imm
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}
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LCTP 1111 0 0000 000 1111 1110 0000 0000 0001
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LCTP 1111 0 0000 000 1111 1110 0000 0000 0001
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]
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]
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@ -8134,7 +8134,11 @@ static bool trans_WLS(DisasContext *s, arg_WLS *a)
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return false;
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return false;
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}
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}
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if (a->rn == 13 || a->rn == 15) {
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if (a->rn == 13 || a->rn == 15) {
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/* CONSTRAINED UNPREDICTABLE: we choose to UNDEF */
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/*
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* For WLSTP rn == 15 is a related encoding (LE); the
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* other cases caught by this condition are all
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* CONSTRAINED UNPREDICTABLE: we choose to UNDEF
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*/
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return false;
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return false;
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}
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}
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if (s->condexec_mask) {
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if (s->condexec_mask) {
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@ -8147,10 +8151,41 @@ static bool trans_WLS(DisasContext *s, arg_WLS *a)
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*/
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*/
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return false;
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return false;
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}
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}
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if (a->size != 4) {
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/* WLSTP */
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if (!dc_isar_feature(aa32_mve, s)) {
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return false;
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}
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/*
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* We need to check that the FPU is enabled here, but mustn't
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* call vfp_access_check() to do that because we don't want to
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* do the lazy state preservation in the "loop count is zero" case.
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* Do the check-and-raise-exception by hand.
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*/
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if (s->fp_excp_el) {
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gen_exception_insn(s, s->pc_curr, EXCP_NOCP,
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syn_uncategorized(), s->fp_excp_el);
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return true;
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}
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}
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nextlabel = gen_new_label();
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nextlabel = gen_new_label();
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tcg_gen_brcondi_i32(TCG_COND_EQ, cpu_R[a->rn], 0, nextlabel);
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tcg_gen_brcondi_i32(TCG_COND_EQ, cpu_R[a->rn], 0, nextlabel);
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tmp = load_reg(s, a->rn);
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tmp = load_reg(s, a->rn);
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store_reg(s, 14, tmp);
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store_reg(s, 14, tmp);
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if (a->size != 4) {
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/*
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* WLSTP: set FPSCR.LTPSIZE. This requires that we do the
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* lazy state preservation, new FP context creation, etc,
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* that vfp_access_check() does. We know that the actual
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* access check will succeed (ie it won't generate code that
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* throws an exception) because we did that check by hand earlier.
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*/
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bool ok = vfp_access_check(s);
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assert(ok);
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tmp = tcg_const_i32(a->size);
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store_cpu_field(tmp, v7m.ltpsize);
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}
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gen_jmp_tb(s, s->base.pc_next, 1);
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gen_jmp_tb(s, s->base.pc_next, 1);
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gen_set_label(nextlabel);
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gen_set_label(nextlabel);
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