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tcg: Make use of bswap flags in tcg_gen_qemu_ld_*

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We can perform any required sign-extension via TCG_BSWAP_OS.

Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
This commit is contained in:
Richard Henderson 2021-06-13 15:50:29 -07:00
parent 2b836c2ac1
commit 359feba534
1 changed files with 10 additions and 14 deletions
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24
tcg/tcg-op.c
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@ -2876,7 +2876,7 @@ void tcg_gen_qemu_ld_i32(TCGv_i32 val, TCGv addr, TCGArg idx, MemOp memop)
orig_memop = memop;
if (!TCG_TARGET_HAS_MEMORY_BSWAP && (memop & MO_BSWAP)) {
memop &= ~MO_BSWAP;
/* The bswap primitive requires zero-extended input. */
/* The bswap primitive benefits from zero-extended input. */
if ((memop & MO_SSIZE) == MO_SW) {
memop &= ~MO_SIGN;
}
@ -2889,10 +2889,9 @@ void tcg_gen_qemu_ld_i32(TCGv_i32 val, TCGv addr, TCGArg idx, MemOp memop)
if ((orig_memop ^ memop) & MO_BSWAP) {
switch (orig_memop & MO_SIZE) {
case MO_16:
tcg_gen_bswap16_i32(val, val, TCG_BSWAP_IZ | TCG_BSWAP_OZ);
if (orig_memop & MO_SIGN) {
tcg_gen_ext16s_i32(val, val);
}
tcg_gen_bswap16_i32(val, val, (orig_memop & MO_SIGN
? TCG_BSWAP_IZ | TCG_BSWAP_OS
: TCG_BSWAP_IZ | TCG_BSWAP_OZ));
break;
case MO_32:
tcg_gen_bswap32_i32(val, val);
@ -2965,7 +2964,7 @@ void tcg_gen_qemu_ld_i64(TCGv_i64 val, TCGv addr, TCGArg idx, MemOp memop)
orig_memop = memop;
if (!TCG_TARGET_HAS_MEMORY_BSWAP && (memop & MO_BSWAP)) {
memop &= ~MO_BSWAP;
/* The bswap primitive requires zero-extended input. */
/* The bswap primitive benefits from zero-extended input. */
if ((memop & MO_SIGN) && (memop & MO_SIZE) < MO_64) {
memop &= ~MO_SIGN;
}
@ -2976,18 +2975,15 @@ void tcg_gen_qemu_ld_i64(TCGv_i64 val, TCGv addr, TCGArg idx, MemOp memop)
plugin_gen_mem_callbacks(addr, info);
if ((orig_memop ^ memop) & MO_BSWAP) {
int flags = (orig_memop & MO_SIGN
? TCG_BSWAP_IZ | TCG_BSWAP_OS
: TCG_BSWAP_IZ | TCG_BSWAP_OZ);
switch (orig_memop & MO_SIZE) {
case MO_16:
tcg_gen_bswap16_i64(val, val, TCG_BSWAP_IZ | TCG_BSWAP_OZ);
if (orig_memop & MO_SIGN) {
tcg_gen_ext16s_i64(val, val);
}
tcg_gen_bswap16_i64(val, val, flags);
break;
case MO_32:
tcg_gen_bswap32_i64(val, val, TCG_BSWAP_IZ | TCG_BSWAP_OZ);
if (orig_memop & MO_SIGN) {
tcg_gen_ext32s_i64(val, val);
}
tcg_gen_bswap32_i64(val, val, flags);
break;
case MO_64:
tcg_gen_bswap64_i64(val, val);