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tcg: Introduce INDEX_op_qemu_st8_i32

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Enable this on i386 to restrict the set of input registers
for an 8-bit store, as required by the architecture.  This
removes the last use of scratch registers for user-only mode.

Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
This commit is contained in:
Richard Henderson 2020-12-09 13:58:39 -06:00
parent d2ef1b83a7
commit 07ce0b0530
15 changed files with 49 additions and 12 deletions
Download patch file Download diff file Expand all files Collapse all files

6
tcg/tcg-op.c
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@ -2883,7 +2883,11 @@ void tcg_gen_qemu_st_i32(TCGv_i32 val, TCGv addr, TCGArg idx, MemOp memop)
}
addr = plugin_prep_mem_callbacks(addr);
gen_ldst_i32(INDEX_op_qemu_st_i32, val, addr, memop, idx);
if (TCG_TARGET_HAS_qemu_st8_i32 && (memop & MO_SIZE) == MO_8) {
gen_ldst_i32(INDEX_op_qemu_st8_i32, val, addr, memop, idx);
} else {
gen_ldst_i32(INDEX_op_qemu_st_i32, val, addr, memop, idx);
}
plugin_gen_mem_callbacks(addr, info);
if (swap) {