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| author | Richard Henderson <richard.henderson@linaro.org> | 2024-06-19 05:41:13 +0000 |
|---|---|---|
| committer | Richard Henderson <richard.henderson@linaro.org> | 2024-06-19 13:50:22 -0700 |
| commit | 521d7fb3ebdf88112ed13556a93e3037742b9eb8 (patch) | |
| tree | 66dda2f940150eeab148798000ef20eb57cfc56e | |
| parent | 6b4965373e561b77f91cfbdf41353635c9661358 (diff) | |
| download | qemu-521d7fb3ebdf88112ed13556a93e3037742b9eb8.zip qemu-521d7fb3ebdf88112ed13556a93e3037742b9eb8.tar.gz qemu-521d7fb3ebdf88112ed13556a93e3037742b9eb8.tar.bz2 | |
tcg/loongarch64: Fix tcg_out_movi vs some pcrel pointers
Simplify the logic for two-part, 32-bit pc-relative addresses.
Rather than assume all such fit in int32_t, do some arithmetic
and assert a result, do some arithmetic first and then check
to see if the pieces are in range.
Cc: qemu-stable@nongnu.org
Fixes: dacc51720db ("tcg/loongarch64: Implement tcg_out_mov and tcg_out_movi")
Reviewed-by: Song Gao <gaosong@loongson.cn>
Reported-by: Song Gao <gaosong@loongson.cn>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
| -rw-r--r-- | tcg/loongarch64/tcg-target.c.inc | 32 |
1 files changed, 15 insertions, 17 deletions
diff --git a/tcg/loongarch64/tcg-target.c.inc b/tcg/loongarch64/tcg-target.c.inc index 1c4dc4d..5b7ed5c 100644 --- a/tcg/loongarch64/tcg-target.c.inc +++ b/tcg/loongarch64/tcg-target.c.inc @@ -382,8 +382,7 @@ static void tcg_out_movi(TCGContext *s, TCGType type, TCGReg rd, * back to the slow path. */ - intptr_t pc_offset; - tcg_target_long val_lo, val_hi, pc_hi, offset_hi; + intptr_t src_rx, pc_offset; tcg_target_long hi12, hi32, hi52; /* Value fits in signed i32. */ @@ -393,24 +392,23 @@ static void tcg_out_movi(TCGContext *s, TCGType type, TCGReg rd, } /* PC-relative cases. */ - pc_offset = tcg_pcrel_diff(s, (void *)val); - if (pc_offset == sextreg(pc_offset, 0, 22) && (pc_offset & 3) == 0) { - /* Single pcaddu2i. */ - tcg_out_opc_pcaddu2i(s, rd, pc_offset >> 2); - return; + src_rx = (intptr_t)tcg_splitwx_to_rx(s->code_ptr); + if ((val & 3) == 0) { + pc_offset = val - src_rx; + if (pc_offset == sextreg(pc_offset, 0, 22)) { + /* Single pcaddu2i. */ + tcg_out_opc_pcaddu2i(s, rd, pc_offset >> 2); + return; + } } - if (pc_offset == (int32_t)pc_offset) { - /* Offset within 32 bits; load with pcalau12i + ori. */ - val_lo = sextreg(val, 0, 12); - val_hi = val >> 12; - pc_hi = (val - pc_offset) >> 12; - offset_hi = val_hi - pc_hi; - - tcg_debug_assert(offset_hi == sextreg(offset_hi, 0, 20)); - tcg_out_opc_pcalau12i(s, rd, offset_hi); + pc_offset = (val >> 12) - (src_rx >> 12); + if (pc_offset == sextreg(pc_offset, 0, 20)) { + /* Load with pcalau12i + ori. */ + tcg_target_long val_lo = val & 0xfff; + tcg_out_opc_pcalau12i(s, rd, pc_offset); if (val_lo != 0) { - tcg_out_opc_ori(s, rd, rd, val_lo & 0xfff); + tcg_out_opc_ori(s, rd, rd, val_lo); } return; } |