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| author | Richard Henderson | 2021-06-13 07:42:13 +0200 |
|---|---|---|
| committer | Richard Henderson | 2021-06-29 19:04:57 +0200 |
| commit | 7335a3d69fdbd4a22a3bafc8b62c44c99e63880b (patch) | |
| tree | 599c5e4c8a5fdc0f7253fee63fae1338ad2a4ef3 /tcg | |
| parent | tcg: Add flags argument to bswap opcodes (diff) | |
| download | qemu-7335a3d69fdbd4a22a3bafc8b62c44c99e63880b.tar.gz qemu-7335a3d69fdbd4a22a3bafc8b62c44c99e63880b.tar.xz qemu-7335a3d69fdbd4a22a3bafc8b62c44c99e63880b.zip | |
tcg/i386: Support bswap flags
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>
Diffstat (limited to 'tcg')
| -rw-r--r-- | tcg/i386/tcg-target.c.inc | 20 |
1 files changed, 19 insertions, 1 deletions
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): |