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[Qemu-arm] [RISU PATCH v3 09/22] risugen: use fewer insns for aarch64 im
From: |
Alex Bennée |
Subject: |
[Qemu-arm] [RISU PATCH v3 09/22] risugen: use fewer insns for aarch64 immediate load |
Date: |
Wed, 13 Jun 2018 13:55:48 +0100 |
From: Richard Henderson <address@hidden>
Signed-off-by: Alex Bennée <address@hidden>
---
risugen_arm.pm | 32 +++++++++++++++++++-------------
1 file changed, 19 insertions(+), 13 deletions(-)
diff --git a/risugen_arm.pm b/risugen_arm.pm
index 83e521d..485e94e 100644
--- a/risugen_arm.pm
+++ b/risugen_arm.pm
@@ -261,15 +261,13 @@ sub write_mov_rr($$)
sub write_mov_ri16($$$)
{
- # Write 16 bits of immediate to register, using either MOVW or MOVT
+ # Write 16 bits of immediate to register.
my ($rd, $imm, $is_movt) = @_;
- die "write_mov_ri16: immediate $imm out of range\n" if (($imm &
0xffff0000) != 0);
- if ($is_aarch64) {
- # Use MOVZ 0x52800000. is_movt means MOVK of high bits */
- insn32(0xd2800000 | ($is_movt << 29) | ($is_movt ? 16 << 17 : 0) |
($imm << 5) | $rd);
+ die "write_mov_ri16: invalid operation for this arch.\n" if ($is_aarch64);
+ die "write_mov_ri16: immediate $imm out of range\n" if (($imm &
0xffff0000) != 0);
- } elsif ($is_thumb) {
+ if ($is_thumb) {
# enc T3
my ($imm4, $i, $imm3, $imm8) = (($imm & 0xf000) >> 12,
($imm & 0x0800) >> 11,
@@ -287,16 +285,24 @@ sub write_mov_ri16($$$)
sub write_mov_ri($$)
{
- # We always use a MOVW/MOVT pair, for simplicity.
- # on aarch64, we use a MOVZ/MOVK pair.
my ($rd, $imm) = @_;
- write_mov_ri16($rd, ($imm & 0xffff), 0);
my $highhalf = ($imm >> 16) & 0xffff;
- write_mov_ri16($rd, $highhalf, 1) if $highhalf;
- if ($is_aarch64 && $imm < 0) {
- # sign extend to allow small negative imm constants
- write_sxt32($rd, $rd);
+ if ($is_aarch64) {
+ if ($imm < 0) {
+ # MOVN
+ insn32(0x92800000 | ((~$imm & 0xffff) << 5) | $rd);
+ # MOVK, LSL 16
+ insn32(0xf2a00000 | ($highhalf << 5) | $rd) if $highhalf != 0xffff;
+ } else {
+ # MOVZ
+ insn32(0x52800000 | (($imm & 0xffff) << 5) | $rd);
+ # MOVK, LSL 16
+ insn32(0xf2a00000 | ($highhalf << 5) | $rd) if $highhalf != 0;
+ }
+ } else {
+ write_mov_ri16($rd, ($imm & 0xffff), 0);
+ write_mov_ri16($rd, $highhalf, 1) if $highhalf;
}
}
--
2.17.1
- Re: [Qemu-arm] [RISU PATCH v3 06/22] Makefile: include risu_reginfo_$(ARCH) in HDRS, (continued)
- [Qemu-arm] [RISU PATCH v3 08/22] risugen: Initialize sve predicates with random data, Alex Bennée, 2018/06/13
- [Qemu-arm] [RISU PATCH v3 01/22] risu_reginfo_aarch64: include signal.h for FPSIMD_MAGIC, Alex Bennée, 2018/06/13
- [Qemu-arm] [RISU PATCH v3 07/22] risugen: add --sve support, Alex Bennée, 2018/06/13
- [Qemu-arm] [RISU PATCH v3 05/22] risu: add zlib indication to help text, Alex Bennée, 2018/06/13
- [Qemu-arm] [RISU PATCH v3 04/22] build-all-arches: do a distclean $(SRC) configured, Alex Bennée, 2018/06/13
- [Qemu-arm] [RISU PATCH v3 09/22] risugen: use fewer insns for aarch64 immediate load,
Alex Bennée <=
- [Qemu-arm] [RISU PATCH v3 15/22] risu_reginfo_aarch64: drop stray ;, Alex Bennée, 2018/06/13
- [Qemu-arm] [RISU PATCH v3 11/22] risugen: add dtype_msz address helper, Alex Bennée, 2018/06/13
- [Qemu-arm] [RISU PATCH v3 10/22] risugen: add reg_plus_imm_pl and reg_plus_imm_vl address helpers, Alex Bennée, 2018/06/13
- [Qemu-arm] [RISU PATCH v3 17/22] risu_reginfo: introduce reginfo_size(), Alex Bennée, 2018/06/13
- [Qemu-arm] [RISU PATCH v3 18/22] risu_reginfo_aarch64: left justify regnums and drop masks, Alex Bennée, 2018/06/13
- [Qemu-arm] [RISU PATCH v3 19/22] risu_reginfo_aarch64: add support for copying SVE register state, Alex Bennée, 2018/06/13