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authorRichard Henderson <rth@twiddle.net>2013-07-25 10:00:41 -1000
committerRichard Henderson <rth@twiddle.net>2013-08-26 13:31:53 -0700
commit8023ccda079624221e618efeb537b41c70407469 (patch)
tree44e3208c8619c46b51b3ffd5128f3fe711e304dc /tcg
parentac26eb69a311396668809eadbf7ff4e623447d4c (diff)
tcg-i386: Try pc-relative lea for constant formation
Use a 7 byte lea before the ultimate 10 byte movq. Signed-off-by: Richard Henderson <rth@twiddle.net>
Diffstat (limited to 'tcg')
-rw-r--r--tcg/i386/tcg-target.c25
1 files changed, 20 insertions, 5 deletions
diff --git a/tcg/i386/tcg-target.c b/tcg/i386/tcg-target.c
index 841bd750e4..82261713a8 100644
--- a/tcg/i386/tcg-target.c
+++ b/tcg/i386/tcg-target.c
@@ -541,19 +541,34 @@ static inline void tcg_out_mov(TCGContext *s, TCGType type,
static void tcg_out_movi(TCGContext *s, TCGType type,
TCGReg ret, tcg_target_long arg)
{
+ tcg_target_long diff;
+
if (arg == 0) {
tgen_arithr(s, ARITH_XOR, ret, ret);
return;
- } else if (arg == (uint32_t)arg || type == TCG_TYPE_I32) {
+ }
+ if (arg == (uint32_t)arg || type == TCG_TYPE_I32) {
tcg_out_opc(s, OPC_MOVL_Iv + LOWREGMASK(ret), 0, ret, 0);
tcg_out32(s, arg);
- } else if (arg == (int32_t)arg) {
+ return;
+ }
+ if (arg == (int32_t)arg) {
tcg_out_modrm(s, OPC_MOVL_EvIz + P_REXW, 0, ret);
tcg_out32(s, arg);
- } else {
- tcg_out_opc(s, OPC_MOVL_Iv + P_REXW + LOWREGMASK(ret), 0, ret, 0);
- tcg_out64(s, arg);
+ return;
}
+
+ /* Try a 7 byte pc-relative lea before the 10 byte movq. */
+ diff = arg - ((tcg_target_long)s->code_ptr + 7);
+ if (diff == (int32_t)diff) {
+ tcg_out_opc(s, OPC_LEA | P_REXW, ret, 0, 0);
+ tcg_out8(s, (LOWREGMASK(ret) << 3) | 5);
+ tcg_out32(s, diff);
+ return;
+ }
+
+ tcg_out_opc(s, OPC_MOVL_Iv + P_REXW + LOWREGMASK(ret), 0, ret, 0);
+ tcg_out64(s, arg);
}
static inline void tcg_out_pushi(TCGContext *s, tcg_target_long val)