diff options
| -rw-r--r-- | tcg/aarch64/tcg-target.inc.c | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/tcg/aarch64/tcg-target.inc.c b/tcg/aarch64/tcg-target.inc.c index 585b0d6..deb5967 100644 --- a/tcg/aarch64/tcg-target.inc.c +++ b/tcg/aarch64/tcg-target.inc.c @@ -964,6 +964,15 @@ static inline void tcg_out_addsub2(TCGContext *s, int ext, TCGReg rl, insn = I3401_SUBSI; bl = -bl; } + if (unlikely(al == TCG_REG_XZR)) { + /* ??? We want to allow al to be zero for the benefit of + negation via subtraction. However, that leaves open the + possibility of adding 0+const in the low part, and the + immediate add instructions encode XSP not XZR. Don't try + anything more elaborate here than loading another zero. */ + al = TCG_REG_TMP; + tcg_out_movi(s, ext, al, 0); + } tcg_out_insn_3401(s, insn, ext, rl, al, bl); } else { tcg_out_insn_3502(s, sub ? I3502_SUBS : I3502_ADDS, ext, rl, al, bl); |