[PATCH] Hexagon (target/hexagon) TCG generation cleanup

[Taylor Simpson <tsimpson@quicinc.com>]

Simplify TCG generation of hex_reg_written

Address feedback from Richard Henderson <<richard.henderson@linaro.org>

Signed-off-by: Taylor Simpson <tsimpson@quicinc.com>
---
 target/hexagon/genptr.c | 12 +++++++++---
 1 file changed, 9 insertions(+), 3 deletions(-)

diff --git a/target/hexagon/genptr.c b/target/hexagon/genptr.c
index 7481f4c..0ad63fe 100644
--- a/target/hexagon/genptr.c
+++ b/target/hexagon/genptr.c
@@ -43,9 +43,15 @@ static inline void gen_log_predicated_reg_write(int rnum, TCGv val, int slot)
     tcg_gen_movcond_tl(TCG_COND_EQ, hex_new_value[rnum], slot_mask, zero,
                            val, hex_new_value[rnum]);
 #if HEX_DEBUG
-    /* Do this so HELPER(debug_commit_end) will know */
-    tcg_gen_movcond_tl(TCG_COND_EQ, hex_reg_written[rnum], slot_mask, zero,
-                       one, hex_reg_written[rnum]);
+    /*
+     * Do this so HELPER(debug_commit_end) will know
+     *
+     * Note that slot_mask indicates the value is not written
+     * (i.e., slot was cancelled), so we negate the value before
+     * or'ing with hex_reg_written[rnum].
+     */
+    tcg_gen_xori_tl(slot_mask, slot_mask, 1 << slot);
+    tcg_gen_or_tl(hex_reg_written[rnum], hex_reg_written[rnum], slot_mask);
 #endif
 
     tcg_temp_free(one);
-- 
2.7.4