From 7ba7657bc9359b74576efe1b7b4de58271ea97b9 Mon Sep 17 00:00:00 2001
From: Taylor Simpson <tsimpson@quicinc.com>
Date: Fri, 13 Aug 2021 00:22:23 -0500
Subject: [PATCH] Hexagon HVX (target/hexagon) helper overrides for histogram
 instructions

Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Taylor Simpson <tsimpson@quicinc.com>
---
 target/hexagon/gen_tcg_hvx.h | 106 +++++++++++++++++++++++++++++++++++
 1 file changed, 106 insertions(+)

diff --git a/target/hexagon/gen_tcg_hvx.h b/target/hexagon/gen_tcg_hvx.h
index b5c6cadd73..a560504b78 100644
--- a/target/hexagon/gen_tcg_hvx.h
+++ b/target/hexagon/gen_tcg_hvx.h
@@ -18,4 +18,110 @@
 #ifndef HEXAGON_GEN_TCG_HVX_H
 #define HEXAGON_GEN_TCG_HVX_H
 
+/*
+ * Histogram instructions
+ *
+ * Note that these instructions operate directly on the vector registers
+ * and therefore happen after commit.
+ *
+ * The generate_<tag> function is called twice
+ *     The first time is during the normal TCG generation
+ *         ctx->pre_commit is true
+ *         In the masked cases, we save the mask to the qtmp temporary
+ *         Otherwise, there is nothing to do
+ *     The second call is at the end of gen_commit_packet
+ *         ctx->pre_commit is false
+ *         Generate the call to the helper
+ */
+
+static inline void assert_vhist_tmp(DisasContext *ctx)
+{
+    /* vhist instructions require exactly one .tmp to be defined */
+    g_assert(ctx->tmp_vregs_idx == 1);
+}
+
+#define fGEN_TCG_V6_vhist(SHORTCODE) \
+    if (!ctx->pre_commit) { \
+        assert_vhist_tmp(ctx); \
+        gen_helper_vhist(cpu_env); \
+    }
+#define fGEN_TCG_V6_vhistq(SHORTCODE) \
+    do { \
+        if (ctx->pre_commit) { \
+            intptr_t dstoff = offsetof(CPUHexagonState, qtmp); \
+            tcg_gen_gvec_mov(MO_64, dstoff, QvV_off, \
+                             sizeof(MMVector), sizeof(MMVector)); \
+        } else { \
+            assert_vhist_tmp(ctx); \
+            gen_helper_vhistq(cpu_env); \
+        } \
+    } while (0)
+#define fGEN_TCG_V6_vwhist256(SHORTCODE) \
+    if (!ctx->pre_commit) { \
+        assert_vhist_tmp(ctx); \
+        gen_helper_vwhist256(cpu_env); \
+    }
+#define fGEN_TCG_V6_vwhist256q(SHORTCODE) \
+    do { \
+        if (ctx->pre_commit) { \
+            intptr_t dstoff = offsetof(CPUHexagonState, qtmp); \
+            tcg_gen_gvec_mov(MO_64, dstoff, QvV_off, \
+                             sizeof(MMVector), sizeof(MMVector)); \
+        } else { \
+            assert_vhist_tmp(ctx); \
+            gen_helper_vwhist256q(cpu_env); \
+        } \
+    } while (0)
+#define fGEN_TCG_V6_vwhist256_sat(SHORTCODE) \
+    if (!ctx->pre_commit) { \
+        assert_vhist_tmp(ctx); \
+        gen_helper_vwhist256_sat(cpu_env); \
+    }
+#define fGEN_TCG_V6_vwhist256q_sat(SHORTCODE) \
+    do { \
+        if (ctx->pre_commit) { \
+            intptr_t dstoff = offsetof(CPUHexagonState, qtmp); \
+            tcg_gen_gvec_mov(MO_64, dstoff, QvV_off, \
+                             sizeof(MMVector), sizeof(MMVector)); \
+        } else { \
+            assert_vhist_tmp(ctx); \
+            gen_helper_vwhist256q_sat(cpu_env); \
+        } \
+    } while (0)
+#define fGEN_TCG_V6_vwhist128(SHORTCODE) \
+    if (!ctx->pre_commit) { \
+        assert_vhist_tmp(ctx); \
+        gen_helper_vwhist128(cpu_env); \
+    }
+#define fGEN_TCG_V6_vwhist128q(SHORTCODE) \
+    do { \
+        if (ctx->pre_commit) { \
+            intptr_t dstoff = offsetof(CPUHexagonState, qtmp); \
+            tcg_gen_gvec_mov(MO_64, dstoff, QvV_off, \
+                             sizeof(MMVector), sizeof(MMVector)); \
+        } else { \
+            assert_vhist_tmp(ctx); \
+            gen_helper_vwhist128q(cpu_env); \
+        } \
+    } while (0)
+#define fGEN_TCG_V6_vwhist128m(SHORTCODE) \
+    if (!ctx->pre_commit) { \
+        TCGv tcgv_uiV = tcg_constant_tl(uiV); \
+        assert_vhist_tmp(ctx); \
+        gen_helper_vwhist128m(cpu_env, tcgv_uiV); \
+    }
+#define fGEN_TCG_V6_vwhist128qm(SHORTCODE) \
+    do { \
+        if (ctx->pre_commit) { \
+            intptr_t dstoff = offsetof(CPUHexagonState, qtmp); \
+            tcg_gen_gvec_mov(MO_64, dstoff, QvV_off, \
+                             sizeof(MMVector), sizeof(MMVector)); \
+        } else { \
+            TCGv tcgv_uiV = tcg_constant_tl(uiV); \
+            assert_vhist_tmp(ctx); \
+            gen_helper_vwhist128qm(cpu_env, tcgv_uiV); \
+        } \
+    } while (0)
+
+
 #endif