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tcg/arm: Try pc-relative addresses for movi

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Backports commit 9c39b94f1448770e7e573e9516d2483816785d1b from qemu
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Richard Henderson 2018-03-03 17:13:29 -05:00 committed by Lioncash
parent a5133ccaa1
commit c99edca63b
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GPG key ID: 4E3C3CC1031BA9C7
1 changed files with 26 additions and 12 deletions
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38
qemu/tcg/arm/tcg-target.inc.c
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@ -427,23 +427,37 @@ static inline void tcg_out_dat_imm(TCGContext *s,
static void tcg_out_movi32(TCGContext *s, int cond, int rd, uint32_t arg) static void tcg_out_movi32(TCGContext *s, int cond, int rd, uint32_t arg)
{ {
int rot, opc, rn; int rot, opc, rn, diff;
/* For armv7, make sure not to use movw+movt when mov/mvn would do. /* Check a single MOV/MVN before anything else. */
Speed things up by only checking when movt would be required. rot = encode_imm(arg);
Prior to armv7, have one go at fully rotated immediates before if (rot >= 0) {
doing the decomposition thing below. */ tcg_out_dat_imm(s, cond, ARITH_MOV, rd, 0,
if (!use_armv7_instructions || (arg & 0xffff0000)) { rotl(arg, rot) | (rot << 7));
rot = encode_imm(arg); return;
}
rot = encode_imm(~arg);
if (rot >= 0) {
tcg_out_dat_imm(s, cond, ARITH_MVN, rd, 0,
rotl(~arg, rot) | (rot << 7));
return;
}
/* Check for a pc-relative address. This will usually be the TB,
or within the TB, which is immediately before the code block. */
diff = arg - ((intptr_t)s->code_ptr + 8);
if (diff >= 0) {
rot = encode_imm(diff);
if (rot >= 0) { if (rot >= 0) {
tcg_out_dat_imm(s, cond, ARITH_MOV, rd, 0, tcg_out_dat_imm(s, cond, ARITH_ADD, rd, TCG_REG_PC,
rotl(arg, rot) | (rot << 7)); rotl(diff, rot) | (rot << 7));
return; return;
} }
rot = encode_imm(~arg); } else {
rot = encode_imm(-diff);
if (rot >= 0) { if (rot >= 0) {
tcg_out_dat_imm(s, cond, ARITH_MVN, rd, 0, tcg_out_dat_imm(s, cond, ARITH_SUB, rd, TCG_REG_PC,
rotl(~arg, rot) | (rot << 7)); rotl(-diff, rot) | (rot << 7));
return; return;
} }
} }