mirrors/qemu
0
0 Fork 0
mirror of https://gitlab.com/qemu-project/qemu.git synced 2026-10-28 14:04:39 +08:00
Code Activity

tcg/optimize: Handle min/max opcodes

Browse Source 
Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
Reviewed-by: Philippe Mathieu-Daudé <philmd@oss.qualcomm.com>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
This commit is contained in:
Richard Henderson committed 2026-08-18 17:31:49 -07:00
1 parent 90aa356edc
commit db9be9b136
1 file changed
+52
Download Patch File Download Diff File Expand all files Collapse all files
tcg/optimize.c
+52
View File
@@ -597,6 +597,30 @@ static uint64_t do_constant_folding_2(TCGOpcode op, TCGType type,
}
return (uint64_t)x % ((uint64_t)y ? : 1);
case INDEX_op_smax:
if (type == TCG_TYPE_I32) {
return MAX((int32_t)x, (int32_t)y);
}
return MAX((int64_t)x, (int64_t)y);
case INDEX_op_smin:
if (type == TCG_TYPE_I32) {
return MIN((int32_t)x, (int32_t)y);
}
return MIN((int64_t)x, (int64_t)y);
case INDEX_op_umax:
if (type == TCG_TYPE_I32) {
return MAX((uint32_t)x, (uint32_t)y);
}
return MAX((uint64_t)x, (uint64_t)y);
case INDEX_op_umin:
if (type == TCG_TYPE_I32) {
return MIN((uint32_t)x, (uint32_t)y);
}
return MIN((uint64_t)x, (uint64_t)y);
default:
g_assert_not_reached();
}
@@ -2101,6 +2125,16 @@ static bool fold_mb(OptContext *ctx, TCGOp *op)
return true;
}
static bool fold_minmax(OptContext *ctx, TCGOp *op, uint64_t bound)
{
if (fold_const2_commutative(ctx, op) ||
fold_xi_to_i(ctx, op, bound) ||
fold_xx_to_x(ctx, op)) {
return true;
}
return finish_folding(ctx, op);
}
static bool fold_mov(OptContext *ctx, TCGOp *op)
{
return tcg_opt_gen_mov(ctx, op, op->args[0], op->args[1]);
@@ -3258,6 +3292,14 @@ void tcg_optimize(TCGContext *s)
case INDEX_op_sextract:
done = fold_sextract(&ctx, op);
break;
case INDEX_op_smax:
done = fold_minmax(&ctx, op, (ctx.type == TCG_TYPE_I32
? INT32_MAX : INT64_MAX));
break;
case INDEX_op_smin:
done = fold_minmax(&ctx, op, (ctx.type == TCG_TYPE_I32
? INT32_MIN : INT64_MIN));
break;
case INDEX_op_sub:
done = fold_sub(&ctx, op);
break;
@@ -3273,6 +3315,16 @@ void tcg_optimize(TCGContext *s)
case INDEX_op_sub_vec:
done = fold_sub_vec(&ctx, op);
break;
case INDEX_op_umax:
/*
* Note that 32-bit constants are stored sign extended,
* so (int32_t)UINT32_MAX == -1.
*/
done = fold_minmax(&ctx, op, -1);
break;
case INDEX_op_umin:
done = fold_minmax(&ctx, op, 0);
break;
case INDEX_op_xor:
case INDEX_op_xor_vec:
done = fold_xor(&ctx, op);