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| author | Richard Henderson <richard.henderson@linaro.org> | 2024-09-06 21:00:10 -0700 |
|---|---|---|
| committer | Richard Henderson <richard.henderson@linaro.org> | 2024-09-22 06:54:49 +0200 |
| commit | 141125e08cf422e22d40b0114a265c83d888767a (patch) | |
| tree | a20ba416fd3e5366dea6442f5b305660c1c48834 /tcg/optimize.c | |
| parent | fcc54e7bf56ba627f9b6ac4a32c6b446d2591ccf (diff) | |
| download | focaccia-qemu-141125e08cf422e22d40b0114a265c83d888767a.tar.gz focaccia-qemu-141125e08cf422e22d40b0114a265c83d888767a.zip | |
tcg/optimize: Fold movcond with true and false values identical
Fold "x = cond ? y : y" to "x = y". Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org> Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Diffstat (limited to 'tcg/optimize.c')
| -rw-r--r-- | tcg/optimize.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/tcg/optimize.c b/tcg/optimize.c index ba16ec27e2..cf311790e0 100644 --- a/tcg/optimize.c +++ b/tcg/optimize.c @@ -1851,6 +1851,11 @@ static bool fold_movcond(OptContext *ctx, TCGOp *op) { int i; + /* If true and false values are the same, eliminate the cmp. */ + if (args_are_copies(op->args[3], op->args[4])) { + return tcg_opt_gen_mov(ctx, op, op->args[0], op->args[3]); + } + /* * Canonicalize the "false" input reg to match the destination reg so * that the tcg backend can implement a "move if true" operation. |