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[PULL,v2,51/60] tcg/optimize: Use fold_xi_to_x for div

Message ID 20211029043329.1518029-52-richard.henderson@linaro.org
State Accepted
Commit 2f9d9a34221feb80d5b1fc6b584f910f8cee317a
Headers show
Series tcg patch queue | expand

Commit Message

Richard Henderson Oct. 29, 2021, 4:33 a.m. UTC 
Recognize the identity function for division.

Suggested-by: Luis Pires <luis.pires@eldorado.org.br>
Reviewed-by: Luis Pires <luis.pires@eldorado.org.br>

Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>

---
 tcg/optimize.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

-- 
2.25.1
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Patch

diff --git a/tcg/optimize.c b/tcg/optimize.c
index 907049fb06..f8b0709157 100644
--- a/tcg/optimize.c
+++ b/tcg/optimize.c
@@ -1218,7 +1218,11 @@  static bool fold_deposit(OptContext *ctx, TCGOp *op)
 
 static bool fold_divide(OptContext *ctx, TCGOp *op)
 {
-    return fold_const2(ctx, op);
+    if (fold_const2(ctx, op) ||
+        fold_xi_to_x(ctx, op, 1)) {
+        return true;
+    }
+    return false;
 }
 
 static bool fold_dup(OptContext *ctx, TCGOp *op)