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tcg/riscv: Use BEXTI for single-bit extractions

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Acked-by: Alistair Francis <alistair.francis@wdc.com>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Message-ID: <20250102181601.1421059-3-richard.henderson@linaro.org>
This commit is contained in:
Richard Henderson 2025-01-02 10:16:01 -08:00
parent 2c4815590f
commit ee97eef290
2 changed files with 16 additions and 3 deletions
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8
tcg/riscv/tcg-target-has.h
View File

@ -110,7 +110,13 @@ tcg_target_extract_valid(TCGType type, unsigned ofs, unsigned len)
/* ofs > 0 uses SRLIW; ofs == 0 uses add.uw. */
return ofs || (cpuinfo & CPUINFO_ZBA);
}
return (cpuinfo & CPUINFO_ZBB) && ofs == 0 && len == 16;
switch (len) {
case 1:
return (cpuinfo & CPUINFO_ZBS) && ofs != 0;
case 16:
return (cpuinfo & CPUINFO_ZBB) && ofs == 0;
}
return false;
}
#define TCG_TARGET_extract_valid tcg_target_extract_valid

11
tcg/riscv/tcg-target.c.inc
View File

@ -163,6 +163,7 @@ typedef enum {
OPC_ANDI = 0x7013,
OPC_AUIPC = 0x17,
OPC_BEQ = 0x63,
OPC_BEXTI = 0x48005013,
OPC_BGE = 0x5063,
OPC_BGEU = 0x7063,
OPC_BLT = 0x4063,
@ -2354,9 +2355,15 @@ static void tcg_out_op(TCGContext *s, TCGOpcode opc, TCGType type,
}
/* FALLTHRU */
case INDEX_op_extract_i32:
if (a2 == 0 && args[3] == 16) {
switch (args[3]) {
case 1:
tcg_out_opc_imm(s, OPC_BEXTI, a0, a1, a2);
break;
case 16:
tcg_debug_assert(a2 == 0);
tcg_out_ext16u(s, a0, a1);
} else {
break;
default:
g_assert_not_reached();
}
break;