From: Richard Henderson <richard.henderson@linaro.org>
To: qemu-devel@nongnu.org
Cc: Peter Maydell <peter.maydell@linaro.org>
Subject: [PATCH v3 02/29] tcg/i386: Support bswap flags
Date: Fri, 25 Jun 2021 23:36:04 -0700 [thread overview]
Message-ID: <20210626063631.2411938-3-richard.henderson@linaro.org> (raw)
In-Reply-To: <20210626063631.2411938-1-richard.henderson@linaro.org>
Retain the current rorw bswap16 expansion for the zero-in/zero-out case.
Otherwise, perform a wider bswap plus a right-shift or extend.
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
---
tcg/i386/tcg-target.c.inc | 20 +++++++++++++++++++-
1 file changed, 19 insertions(+), 1 deletion(-)
diff --git a/tcg/i386/tcg-target.c.inc b/tcg/i386/tcg-target.c.inc
index 34113388ef..98d924b91a 100644
--- a/tcg/i386/tcg-target.c.inc
+++ b/tcg/i386/tcg-target.c.inc
@@ -2421,10 +2421,28 @@ static inline void tcg_out_op(TCGContext *s, TCGOpcode opc,
break;
OP_32_64(bswap16):
- tcg_out_rolw_8(s, a0);
+ if (a2 & TCG_BSWAP_OS) {
+ /* Output must be sign-extended. */
+ if (rexw) {
+ tcg_out_bswap64(s, a0);
+ tcg_out_shifti(s, SHIFT_SAR + rexw, a0, 48);
+ } else {
+ tcg_out_bswap32(s, a0);
+ tcg_out_shifti(s, SHIFT_SAR, a0, 16);
+ }
+ } else if ((a2 & (TCG_BSWAP_IZ | TCG_BSWAP_OZ)) == TCG_BSWAP_OZ) {
+ /* Output must be zero-extended, but input isn't. */
+ tcg_out_bswap32(s, a0);
+ tcg_out_shifti(s, SHIFT_SHR, a0, 16);
+ } else {
+ tcg_out_rolw_8(s, a0);
+ }
break;
OP_32_64(bswap32):
tcg_out_bswap32(s, a0);
+ if (rexw && (a2 & TCG_BSWAP_OS)) {
+ tcg_out_ext32s(s, a0, a0);
+ }
break;
OP_32_64(neg):
--
2.25.1
next prev parent reply other threads:[~2021-06-26 6:39 UTC|newest]
Thread overview: 40+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-06-26 6:36 [PATCH v3 00/29] tcg: bswap improvements Richard Henderson
2021-06-26 6:36 ` [PATCH v3 01/29] tcg: Add flags argument to bswap opcodes Richard Henderson
2021-06-26 6:36 ` Richard Henderson [this message]
2021-06-26 6:36 ` [PATCH v3 03/29] tcg/aarch64: Merge tcg_out_rev{16,32,64} Richard Henderson
2021-06-28 14:16 ` Peter Maydell
2021-06-26 6:36 ` [PATCH v3 04/29] tcg/aarch64: Support bswap flags Richard Henderson
2021-06-26 9:38 ` Philippe Mathieu-Daudé
2021-06-26 6:36 ` [PATCH v3 05/29] tcg/arm: " Richard Henderson
2021-06-26 6:36 ` [PATCH v3 06/29] tcg/ppc: Split out tcg_out_ext{8,16,32}s Richard Henderson
2021-06-26 6:36 ` [PATCH v3 07/29] tcg/ppc: Split out tcg_out_sari{32,64} Richard Henderson
2021-06-26 6:36 ` [PATCH v3 08/29] tcg/ppc: Split out tcg_out_bswap16 Richard Henderson
2021-06-26 6:36 ` [PATCH v3 09/29] tcg/ppc: Split out tcg_out_bswap32 Richard Henderson
2021-06-26 6:36 ` [PATCH v3 10/29] tcg/ppc: Split out tcg_out_bswap64 Richard Henderson
2021-06-26 6:36 ` [PATCH v3 11/29] tcg/ppc: Support bswap flags Richard Henderson
2021-06-26 9:32 ` Philippe Mathieu-Daudé
2021-06-26 6:36 ` [PATCH v3 12/29] tcg/ppc: Use power10 byte-reverse instructions Richard Henderson
2021-06-28 14:33 ` Peter Maydell
2021-06-28 14:45 ` Richard Henderson
2021-06-28 16:22 ` Bruno Piazera Larsen
2021-06-26 6:36 ` [PATCH v3 13/29] tcg/s390: Support bswap flags Richard Henderson
2021-06-28 14:43 ` Peter Maydell
2021-06-28 14:50 ` Richard Henderson
2021-06-26 6:36 ` [PATCH v3 14/29] tcg/mips: Support bswap flags in tcg_out_bswap16 Richard Henderson
2021-06-26 9:30 ` Philippe Mathieu-Daudé
2021-06-26 6:36 ` [PATCH v3 15/29] tcg/mips: Support bswap flags in tcg_out_bswap32 Richard Henderson
2021-06-26 6:36 ` [PATCH v3 16/29] tcg/tci: Support bswap flags Richard Henderson
2021-06-26 6:36 ` [PATCH v3 17/29] tcg: Handle new bswap flags during optimize Richard Henderson
2021-06-26 6:36 ` [PATCH v3 18/29] tcg: Add flags argument to tcg_gen_bswap16_*, tcg_gen_bswap32_i64 Richard Henderson
2021-06-26 6:36 ` [PATCH v3 19/29] tcg: Make use of bswap flags in tcg_gen_qemu_ld_* Richard Henderson
2021-06-26 6:36 ` [PATCH v3 20/29] tcg: Make use of bswap flags in tcg_gen_qemu_st_* Richard Henderson
2021-06-26 6:36 ` [PATCH v3 21/29] target/arm: Improve REV32 Richard Henderson
2021-06-26 6:36 ` [PATCH v3 22/29] target/arm: Improve vector REV Richard Henderson
2021-06-26 6:36 ` [PATCH v3 23/29] target/arm: Improve REVSH Richard Henderson
2021-06-26 6:36 ` [PATCH v3 24/29] target/i386: Improve bswap translation Richard Henderson
2021-06-26 6:36 ` [PATCH v3 25/29] target/sh4: Improve swap.b translation Richard Henderson
2021-06-26 6:36 ` [PATCH v3 26/29] target/mips: Fix gen_mxu_s32ldd_s32lddr Richard Henderson
2021-06-26 6:36 ` [PATCH v3 27/29] tcg/arm: Unset TCG_TARGET_HAS_MEMORY_BSWAP Richard Henderson
2021-06-26 6:36 ` [PATCH v3 28/29] tcg/aarch64: " Richard Henderson
2021-06-26 6:36 ` [PATCH v3 29/29] tcg/riscv: Remove MO_BSWAP handling Richard Henderson
2021-06-26 7:03 ` [PATCH v3 00/29] tcg: bswap improvements no-reply
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