46 lines
1.5 KiB
Diff
46 lines
1.5 KiB
Diff
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From bbed332c7ad12e9885d3f457f366fa0b29445dcd Mon Sep 17 00:00:00 2001
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From: Aurelien Jarno <aurelien@aurel32.net>
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Date: Thu, 6 Sep 2012 16:47:14 +0200
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Subject: [PATCH] tcg/optimize: simplify shift/rot r, 0, a => movi r, 0 cases
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shift/rot r, 0, a is equivalent to movi r, 0.
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Reviewed-by: Richard Henderson <rth@twiddle.net>
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Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
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Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com>
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---
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tcg/optimize.c | 20 ++++++++++++++++++++
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1 file changed, 20 insertions(+)
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diff --git a/tcg/optimize.c b/tcg/optimize.c
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index c12cb2b..1698ba3 100644
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--- a/tcg/optimize.c
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+++ b/tcg/optimize.c
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@@ -322,6 +322,26 @@ static TCGArg *tcg_constant_folding(TCGContext *s, uint16_t *tcg_opc_ptr,
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break;
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}
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+ /* Simplify expressions for "shift/rot r, 0, a => movi r, 0" */
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+ switch (op) {
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+ CASE_OP_32_64(shl):
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+ CASE_OP_32_64(shr):
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+ CASE_OP_32_64(sar):
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+ CASE_OP_32_64(rotl):
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+ CASE_OP_32_64(rotr):
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+ if (temps[args[1]].state == TCG_TEMP_CONST
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+ && temps[args[1]].val == 0) {
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+ gen_opc_buf[op_index] = op_to_movi(op);
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+ tcg_opt_gen_movi(gen_args, args[0], 0, nb_temps, nb_globals);
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+ args += 3;
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+ gen_args += 2;
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+ continue;
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+ }
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+ break;
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+ default:
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+ break;
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+ }
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+
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/* Simplify expression for "op r, a, 0 => mov r, a" cases */
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switch (op) {
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CASE_OP_32_64(add):
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