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authorRichard Henderson <richard.henderson@linaro.org>2021-06-13 15:50:29 -0700
committerRichard Henderson <richard.henderson@linaro.org>2021-06-29 10:04:57 -0700
commit359feba534b3473471d35934ffd66781aaff468d (patch)
treea9cb8f6c74075f1886b297c13752079b4945a5c0 /tcg/tcg-op.c
parent2b836c2ac1d040bbe2e47fd000924083fbcef414 (diff)
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tcg: Make use of bswap flags in tcg_gen_qemu_ld_*
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>
Diffstat (limited to 'tcg/tcg-op.c')
-rw-r--r--tcg/tcg-op.c24
1 files changed, 10 insertions, 14 deletions
diff --git a/tcg/tcg-op.c b/tcg/tcg-op.c
index 949cbf2..0eac2d1 100644
--- a/tcg/tcg-op.c
+++ b/tcg/tcg-op.c
@@ -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);