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authorAurelien Jarno <aurelien@aurel32.net>2015-07-27 12:41:44 +0200
committerRichard Henderson <rth@twiddle.net>2015-08-24 11:10:54 -0700
commit299f80130401153af1a6ddb3cc011781bcd47600 (patch)
tree10a5e31928b35cd8c9b69cd658c70de48f867fc1 /tcg
parentb41059dd9deec367a4ccd296659f0bc5de2dc705 (diff)
downloadqemu-arm-299f80130401153af1a6ddb3cc011781bcd47600.tar.gz
tcg/optimize: allow constant to have copies
Now that copies and constants are tracked separately, we can allow constant to have copies, deferring the choice to use a register or a constant to the register allocation pass. This prevent this kind of regular constant reloading: -OUT: [size=338] +OUT: [size=298] mov -0x4(%r14),%ebp test %ebp,%ebp jne 0x7ffbe9cb0ed6 mov $0x40002219f8,%rbp mov %rbp,(%r14) - mov $0x40002219f8,%rbp mov $0x4000221a20,%rbx mov %rbp,(%rbx) mov $0x4000000000,%rbp mov %rbp,(%r14) - mov $0x4000000000,%rbp mov $0x4000221d38,%rbx mov %rbp,(%rbx) mov $0x40002221a8,%rbp mov %rbp,(%r14) - mov $0x40002221a8,%rbp mov $0x4000221d40,%rbx mov %rbp,(%rbx) mov $0x4000019170,%rbp mov %rbp,(%r14) - mov $0x4000019170,%rbp mov $0x4000221d48,%rbx mov %rbp,(%rbx) mov $0x40000049ee,%rbp mov %rbp,0x80(%r14) mov %r14,%rdi callq 0x7ffbe99924d0 mov $0x4000001680,%rbp mov %rbp,0x30(%r14) mov 0x10(%r14),%rbp mov $0x4000001680,%rbp mov %rbp,0x30(%r14) mov 0x10(%r14),%rbp shl $0x20,%rbp mov (%r14),%rbx mov %ebx,%ebx mov %rbx,(%r14) or %rbx,%rbp mov %rbp,0x10(%r14) mov %rbp,0x90(%r14) mov 0x60(%r14),%rbx mov %rbx,0x38(%r14) mov 0x28(%r14),%rbx mov $0x4000220e60,%r12 mov %rbx,(%r12) mov $0x40002219c8,%rbx mov %rbp,(%rbx) mov 0x20(%r14),%rbp sub $0x8,%rbp mov $0x4000004a16,%rbx mov %rbx,0x0(%rbp) mov %rbp,0x20(%r14) mov $0x19,%ebp mov %ebp,0xa8(%r14) mov $0x4000015110,%rbp mov %rbp,0x80(%r14) xor %eax,%eax jmpq 0x7ffbebcae426 lea -0x5f6d72a(%rip),%rax # 0x7ffbe3d437b3 jmpq 0x7ffbebcae426 Signed-off-by: Aurelien Jarno <aurelien@aurel32.net> Signed-off-by: Richard Henderson <rth@twiddle.net>
Diffstat (limited to 'tcg')
-rw-r--r--tcg/optimize.c10
1 files changed, 2 insertions, 8 deletions
diff --git a/tcg/optimize.c b/tcg/optimize.c
index 5c60e1c228..a1edfd581b 100644
--- a/tcg/optimize.c
+++ b/tcg/optimize.c
@@ -230,11 +230,6 @@ static void tcg_opt_gen_mov(TCGContext *s, TCGOp *op, TCGArg *args,
return;
}
- if (temp_is_const(src)) {
- tcg_opt_gen_movi(s, op, args, dst, temps[src].val);
- return;
- }
-
TCGOpcode new_op = op_to_mov(op->opc);
tcg_target_ulong mask;
@@ -248,14 +243,13 @@ static void tcg_opt_gen_mov(TCGContext *s, TCGOp *op, TCGArg *args,
}
temps[dst].mask = mask;
- assert(!temp_is_const(src));
-
if (s->temps[src].type == s->temps[dst].type) {
temps[dst].next_copy = temps[src].next_copy;
temps[dst].prev_copy = src;
temps[temps[dst].next_copy].prev_copy = dst;
temps[src].next_copy = dst;
- temps[dst].is_const = false;
+ temps[dst].is_const = temps[src].is_const;
+ temps[dst].val = temps[src].val;
}
args[0] = dst;