diff mbox series

[v2,08/23] target/sparc: Use tcg_gen_movcond_i64 in gen_edge

Message ID 20230818221327.150194-9-richard.henderson@linaro.org
State Superseded
Headers show
Series tcg: Introduce negsetcond opcodes | expand

Commit Message

Richard Henderson Aug. 18, 2023, 10:13 p.m. UTC 
The setcond + neg + or sequence is a complex method of
performing a conditional move.

Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
---
 target/sparc/translate.c | 17 ++++-------------
 1 file changed, 4 insertions(+), 13 deletions(-)
diff mbox series

Patch

diff --git a/target/sparc/translate.c b/target/sparc/translate.c
index bd877a5e4a..fa80a91161 100644
--- a/target/sparc/translate.c
+++ b/target/sparc/translate.c
@@ -2916,7 +2916,7 @@  static void gen_edge(DisasContext *dc, TCGv dst, TCGv s1, TCGv s2,
 
     tcg_gen_shr_tl(lo1, tcg_constant_tl(tabl), lo1);
     tcg_gen_shr_tl(lo2, tcg_constant_tl(tabr), lo2);
-    tcg_gen_andi_tl(dst, lo1, omask);
+    tcg_gen_andi_tl(lo1, lo1, omask);
     tcg_gen_andi_tl(lo2, lo2, omask);
 
     amask = -8;
@@ -2926,18 +2926,9 @@  static void gen_edge(DisasContext *dc, TCGv dst, TCGv s1, TCGv s2,
     tcg_gen_andi_tl(s1, s1, amask);
     tcg_gen_andi_tl(s2, s2, amask);
 
-    /* We want to compute
-        dst = (s1 == s2 ? lo1 : lo1 & lo2).
-       We've already done dst = lo1, so this reduces to
-        dst &= (s1 == s2 ? -1 : lo2)
-       Which we perform by
-        lo2 |= -(s1 == s2)
-        dst &= lo2
-    */
-    tcg_gen_setcond_tl(TCG_COND_EQ, lo1, s1, s2);
-    tcg_gen_neg_tl(lo1, lo1);
-    tcg_gen_or_tl(lo2, lo2, lo1);
-    tcg_gen_and_tl(dst, dst, lo2);
+    /* Compute dst = (s1 == s2 ? lo1 : lo1 & lo2). */
+    tcg_gen_and_tl(lo2, lo2, lo1);
+    tcg_gen_movcond_tl(TCG_COND_EQ, dst, s1, s2, lo1, lo2);
 }
 
 static void gen_alignaddr(TCGv dst, TCGv s1, TCGv s2, bool left)