... and the inverse, CBZ for TSTEQ. Suggested-by: Paolo Bonzini <pbonz...@redhat.com> Signed-off-by: Richard Henderson <richard.hender...@linaro.org> --- tcg/aarch64/tcg-target.c.inc | 8 ++++++++ 1 file changed, 8 insertions(+)
diff --git a/tcg/aarch64/tcg-target.c.inc b/tcg/aarch64/tcg-target.c.inc index 55225313ad..0c98c48f68 100644 --- a/tcg/aarch64/tcg-target.c.inc +++ b/tcg/aarch64/tcg-target.c.inc @@ -1453,6 +1453,7 @@ static void tcg_out_brcond(TCGContext *s, TCGType ext, TCGCond c, TCGArg a, break; case TCG_COND_LT: case TCG_COND_GE: + /* cmp xN,0; b.mi L -> tbnz xN,63,L */ if (b_const && b == 0) { c = (c == TCG_COND_LT ? TCG_COND_TSTNE : TCG_COND_TSTEQ); tbit = ext ? 63 : 31; @@ -1461,6 +1462,13 @@ static void tcg_out_brcond(TCGContext *s, TCGType ext, TCGCond c, TCGArg a, break; case TCG_COND_TSTEQ: case TCG_COND_TSTNE: + /* tst xN,0xffffffff; b.ne L -> cbnz wN,L */ + if (b_const && b == UINT32_MAX) { + ext = TCG_TYPE_I32; + need_cmp = false; + break; + } + /* tst xN,1<<B; b.ne L -> tbnz xN,B,L */ if (b_const && is_power_of_2(b)) { tbit = ctz64(b); need_cmp = false; -- 2.34.1