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[PATCH v3 19/38] tcg/aarch64: Generate CBNZ for TSTNE of UINT32_MAX
From: |
Richard Henderson |
Subject: |
[PATCH v3 19/38] tcg/aarch64: Generate CBNZ for TSTNE of UINT32_MAX |
Date: |
Thu, 11 Jan 2024 09:43:49 +1100 |
... and the inverse, CBZ for TSTEQ.
Suggested-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Richard Henderson <richard.henderson@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
- [PATCH v3 15/38 3/6] target/s390x: Reorder CC_OP_STATIC switch case in disas_jcc (3/5), (continued)
- [PATCH v3 21/38] tcg/arm: Support TCG_COND_TST{EQ,NE}, Richard Henderson, 2024/01/10
- [PATCH v3 12/38] target/m68k: Use TCG_COND_TST{EQ, NE} in gen_fcc_cond, Richard Henderson, 2024/01/10
- [PATCH v3 19/38] tcg/aarch64: Generate CBNZ for TSTNE of UINT32_MAX,
Richard Henderson <=
- [PATCH v3 20/38] tcg/arm: Factor tcg_out_cmp() out, Richard Henderson, 2024/01/10
- [PATCH v3 22/38] tcg/i386: Pass x86 condition codes to tcg_out_cmov, Richard Henderson, 2024/01/10
- [PATCH v3 24/38] tcg/i386: Support TCG_COND_TST{EQ,NE}, Richard Henderson, 2024/01/10
- [PATCH v3 31/38] tcg/ppc: Use cr0 in tcg_to_bc and tcg_to_isel, Richard Henderson, 2024/01/10
- [PATCH v3 17/38] tcg/aarch64: Support TCG_COND_TST{EQ,NE}, Richard Henderson, 2024/01/10
- [PATCH v3 32/38] tcg/ppc: Tidy up tcg_target_const_match, Richard Henderson, 2024/01/10