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authorPeter Maydell <peter.maydell@linaro.org>2020-06-16 18:08:40 +0100
committerPeter Maydell <peter.maydell@linaro.org>2020-06-23 11:39:47 +0100
commit128123ea34e9e6afe4842aefcb9cf84b9642ac22 (patch)
tree82c3e03b631b071fc3a87fb0874703a42006d288 /target/arm/translate-neon.inc.c
parentbaa59323e841f76523f6ad4d746cdeb47ea574cd (diff)
target/arm: Convert Neon 2-reg-misc VRINT insns to decodetree
Convert the Neon 2-reg-misc VRINT insns to decodetree. Giving these insns their own do_vrint() function allows us to change the rounding mode just once at the start and end rather than doing it for every element in the vector. Signed-off-by: Peter Maydell <peter.maydell@linaro.org> Reviewed-by: Richard Henderson <richard.henderson@linaro.org> Message-id: 20200616170844.13318-18-peter.maydell@linaro.org
Diffstat (limited to 'target/arm/translate-neon.inc.c')
-rw-r--r--target/arm/translate-neon.inc.c61
1 files changed, 61 insertions, 0 deletions
diff --git a/target/arm/translate-neon.inc.c b/target/arm/translate-neon.inc.c
index a62da21b15..0e7f86ad15 100644
--- a/target/arm/translate-neon.inc.c
+++ b/target/arm/translate-neon.inc.c
@@ -3796,3 +3796,64 @@ DO_FP_CMP0(VCGE0_F, gen_helper_neon_cge_f32, FWD)
DO_FP_CMP0(VCEQ0_F, gen_helper_neon_ceq_f32, FWD)
DO_FP_CMP0(VCLE0_F, gen_helper_neon_cge_f32, REV)
DO_FP_CMP0(VCLT0_F, gen_helper_neon_cgt_f32, REV)
+
+static bool do_vrint(DisasContext *s, arg_2misc *a, int rmode)
+{
+ /*
+ * Handle a VRINT* operation by iterating 32 bits at a time,
+ * with a specified rounding mode in operation.
+ */
+ int pass;
+ TCGv_ptr fpst;
+ TCGv_i32 tcg_rmode;
+
+ if (!arm_dc_feature(s, ARM_FEATURE_NEON) ||
+ !arm_dc_feature(s, ARM_FEATURE_V8)) {
+ return false;
+ }
+
+ /* UNDEF accesses to D16-D31 if they don't exist. */
+ if (!dc_isar_feature(aa32_simd_r32, s) &&
+ ((a->vd | a->vm) & 0x10)) {
+ return false;
+ }
+
+ if (a->size != 2) {
+ /* TODO: FP16 will be the size == 1 case */
+ return false;
+ }
+
+ if ((a->vd | a->vm) & a->q) {
+ return false;
+ }
+
+ if (!vfp_access_check(s)) {
+ return true;
+ }
+
+ fpst = get_fpstatus_ptr(1);
+ tcg_rmode = tcg_const_i32(arm_rmode_to_sf(rmode));
+ gen_helper_set_neon_rmode(tcg_rmode, tcg_rmode, cpu_env);
+ for (pass = 0; pass < (a->q ? 4 : 2); pass++) {
+ TCGv_i32 tmp = neon_load_reg(a->vm, pass);
+ gen_helper_rints(tmp, tmp, fpst);
+ neon_store_reg(a->vd, pass, tmp);
+ }
+ gen_helper_set_neon_rmode(tcg_rmode, tcg_rmode, cpu_env);
+ tcg_temp_free_i32(tcg_rmode);
+ tcg_temp_free_ptr(fpst);
+
+ return true;
+}
+
+#define DO_VRINT(INSN, RMODE) \
+ static bool trans_##INSN(DisasContext *s, arg_2misc *a) \
+ { \
+ return do_vrint(s, a, RMODE); \
+ }
+
+DO_VRINT(VRINTN, FPROUNDING_TIEEVEN)
+DO_VRINT(VRINTA, FPROUNDING_TIEAWAY)
+DO_VRINT(VRINTZ, FPROUNDING_ZERO)
+DO_VRINT(VRINTM, FPROUNDING_NEGINF)
+DO_VRINT(VRINTP, FPROUNDING_POSINF)