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[PATCH 2/2] Add new skip instruction.
|
From: |
marc . nieper+gnu |
|
Subject: |
[PATCH 2/2] Add new skip instruction. |
|
Date: |
Mon, 31 Oct 2022 13:17:14 +0100 |
From: Marc Nieper-Wißkirchen <marc@nieper-wisskirchen.de>
* .gitignore: Update from Gnulib.
* check/Makefile.am: Add tests.
* check/lightning.c: Handle skip instructions.
* check/protect.c: Rewrite with skip.
* check/skip.ok: New test.
* check/skip.tst: New test.
* doc/body.texi: Document the skip instruction.
* include/lightning.h.in: Add the skip instruction.
* lib/jit_aarch64-sz.c: Update for skip instruction.
* lib/jit_aarch64.c: Implement skip instruction.
* lib/jit_alpha-sz.c: Update for skip instruction.
* lib/jit_alpha.c: Implement skip instruction.
* lib/jit_arm-sz.c: Update for skip instruction.
* lib/jit_arm.c: Implement skip instruction.
* lib/jit_hppa-sz.c: Update for skip instruction.
* lib/jit_hppa.c: Implement skip instruction.
* lib/jit_ia64-sz.c: Update for skip instruction.
* lib/jit_ia64.c: Implement skip instruction.
* lib/jit_loongarch-sz.c: Update for skip instruction.
* lib/jit_loongarch.c: Implement skip instruction.
* lib/jit_mips-sz.c: Update for skip instruction.
* lib/jit_mips.c: Implement skip instruction.
* lib/jit_names.c: Update for skip instruction.
* lib/jit_ppc-sz.c: Update for skip instruction.
* lib/jit_ppc.c: Implement skip instruction.
* lib/jit_riscv-sz.c: Update for skip instruction.
* lib/jit_riscv.c: Implement skip instruction.
* lib/jit_s390-sz.c: Update for skip instruction.
* lib/jit_s390.c: Implement skip instruction.
* lib/jit_size.c: Treat align and skip in a special way.
* lib/jit_sparc-sz.c: Update for skip instruction.
* lib/jit_sparc.c: Implement skip instruction.
* lib/jit_x86-sz.c: Update for skip instruction.
* lib/jit_x86.c: Implement skip instruction.
* lib/lightning.c: Classify skip instruction.
---
.gitignore | 1 +
ChangeLog | 39 +++++++++++++++++++++++++++++++++++++++
check/Makefile.am | 3 ++-
check/lightning.c | 3 +++
check/protect.c | 8 +++-----
check/skip.ok | 1 +
check/skip.tst | 13 +++++++++++++
doc/body.texi | 12 ++++++++++++
include/lightning.h.in | 2 ++
lib/jit_aarch64-sz.c | 1 +
lib/jit_aarch64.c | 3 +++
lib/jit_alpha-sz.c | 1 +
lib/jit_alpha.c | 3 +++
lib/jit_arm-sz.c | 1 +
lib/jit_arm.c | 3 +++
lib/jit_hppa-sz.c | 1 +
lib/jit_hppa.c | 3 +++
lib/jit_ia64-sz.c | 1 +
lib/jit_ia64.c | 4 ++++
lib/jit_loongarch-sz.c | 1 +
lib/jit_loongarch.c | 3 +++
lib/jit_mips-sz.c | 1 +
lib/jit_mips.c | 3 +++
lib/jit_names.c | 1 +
lib/jit_ppc-sz.c | 1 +
lib/jit_ppc.c | 3 +++
lib/jit_riscv-sz.c | 1 +
lib/jit_riscv.c | 3 +++
lib/jit_s390-sz.c | 1 +
lib/jit_s390.c | 3 +++
lib/jit_size.c | 10 +++++++++-
lib/jit_sparc-sz.c | 1 +
lib/jit_sparc.c | 3 +++
lib/jit_x86-sz.c | 4 ++++
lib/jit_x86.c | 5 ++++-
lib/lightning.c | 3 ++-
36 files changed, 141 insertions(+), 9 deletions(-)
create mode 100644 check/skip.ok
create mode 100644 check/skip.tst
diff --git a/.gitignore b/.gitignore
index 6fc5bf9..bc7e971 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,3 +1,4 @@
+/build-aux
+*
*.o
diff --git a/ChangeLog b/ChangeLog
index 0848e6c..e138220 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,42 @@
+2022-10-31 Marc Nieper-Wißkirchen <marc@nieper-wisskirchen.de>
+
+ Add new skip instruction.
+ * .gitignore: Update from Gnulib.
+ * check/Makefile.am: Add tests.
+ * check/lightning.c: Handle skip instructions.
+ * check/protect.c: Rewrite with skip.
+ * check/skip.ok: New test.
+ * check/skip.tst: New test.
+ * doc/body.texi: Document the skip instruction.
+ * include/lightning.h.in: Add the skip instruction.
+ * lib/jit_aarch64-sz.c: Update for skip instruction.
+ * lib/jit_aarch64.c: Implement skip instruction.
+ * lib/jit_alpha-sz.c: Update for skip instruction.
+ * lib/jit_alpha.c: Implement skip instruction.
+ * lib/jit_arm-sz.c: Update for skip instruction.
+ * lib/jit_arm.c: Implement skip instruction.
+ * lib/jit_hppa-sz.c: Update for skip instruction.
+ * lib/jit_hppa.c: Implement skip instruction.
+ * lib/jit_ia64-sz.c: Update for skip instruction.
+ * lib/jit_ia64.c: Implement skip instruction.
+ * lib/jit_loongarch-sz.c: Update for skip instruction.
+ * lib/jit_loongarch.c: Implement skip instruction.
+ * lib/jit_mips-sz.c: Update for skip instruction.
+ * lib/jit_mips.c: Implement skip instruction.
+ * lib/jit_names.c: Update for skip instruction.
+ * lib/jit_ppc-sz.c: Update for skip instruction.
+ * lib/jit_ppc.c: Implement skip instruction.
+ * lib/jit_riscv-sz.c: Update for skip instruction.
+ * lib/jit_riscv.c: Implement skip instruction.
+ * lib/jit_s390-sz.c: Update for skip instruction.
+ * lib/jit_s390.c: Implement skip instruction.
+ * lib/jit_size.c: Treat align and skip in a special way.
+ * lib/jit_sparc-sz.c: Update for skip instruction.
+ * lib/jit_sparc.c: Implement skip instruction.
+ * lib/jit_x86-sz.c: Update for skip instruction.
+ * lib/jit_x86.c: Implement skip instruction.
+ * lib/lightning.c: Classify skip instruction.
+
2022-10-30 Marc Nieper-Wißkirchen <marc@nieper-wisskirchen.de>
Add user-visible functions jit_protect and jit_unprotect.
diff --git a/check/Makefile.am b/check/Makefile.am
index f1839ef..189f3da 100644
--- a/check/Makefile.am
+++ b/check/Makefile.am
@@ -108,6 +108,7 @@ EXTRA_DIST = \
range.tst range.ok \
ranger.tst ranger.ok \
ret.tst ret.ok \
+ skip.tst skip.ok \
tramp.tst tramp.ok \
va_list.tst va_list.ok \
check.sh \
@@ -139,7 +140,7 @@ base_TESTS = \
clobber carry call \
float jmpr live put \
qalu_mul qalu_div \
- range ranger ret tramp \
+ range ranger ret skip tramp \
va_list
$(base_TESTS): check.sh
diff --git a/check/lightning.c b/check/lightning.c
index 4f3b052..bdb70c4 100644
--- a/check/lightning.c
+++ b/check/lightning.c
@@ -270,6 +270,7 @@ static jit_pointer_t get_arg(void);
static jit_word_t get_imm(void);
static void live(void);
static void align(void); static void name(void);
+static void skip(void);
static void prolog(void);
static void frame(void); static void tramp(void);
static void ellipsis(void);
@@ -591,6 +592,7 @@ static instr_t instr_vector[] = {
#define entry2(name, function) { NULL, name, function }
entry(live),
entry(align), entry(name),
+ entry(skip),
entry(prolog),
entry(frame), entry(tramp),
entry(ellipsis),
@@ -1400,6 +1402,7 @@ live(void) {
jit_live(parser.regval);
}
entry_im(align)
+entry_im(skip)
entry(prolog)
entry_im(frame) entry_im(tramp)
entry(ellipsis)
diff --git a/check/protect.c b/check/protect.c
index 256242b..2abedd1 100644
--- a/check/protect.c
+++ b/check/protect.c
@@ -29,6 +29,9 @@ main(int argc, char *argv[])
jit_prepare();
jit_pushargi(1);
jit_finishi(exit);
+ label = jit_indirect();
+ jit_skip(1); /* Reserves enough space for a byte. */
+ jit_patch_at(load, label);
jit_link(ok);
jit_prepare();
jit_pushargi((jit_word_t)"%s\n");
@@ -36,11 +39,6 @@ main(int argc, char *argv[])
jit_pushargi((jit_word_t)"ok");
jit_finishi(printf);
- jit_epilog();
- label = jit_indirect();
- jit_prolog(); /* Reserves enough space for a byte. */
- jit_patch_at(load, label);
-
function = jit_emit();
if (function == NULL)
abort();
diff --git a/check/skip.ok b/check/skip.ok
new file mode 100644
index 0000000..f599e28
--- /dev/null
+++ b/check/skip.ok
@@ -0,0 +1 @@
+10
diff --git a/check/skip.tst b/check/skip.tst
new file mode 100644
index 0000000..94eec76
--- /dev/null
+++ b/check/skip.tst
@@ -0,0 +1,13 @@
+.data 32
+fmt:
+.c "%d\n"
+.code
+ prolog
+ skip 4
+ prepare
+ pushargi fmt
+ ellipsis
+ pushargi 10
+ finishi @printf
+ ret
+ epilog
diff --git a/doc/body.texi b/doc/body.texi
index 58f84ee..d5918a6 100644
--- a/doc/body.texi
+++ b/doc/body.texi
@@ -603,6 +603,14 @@ the next instruction, usually with a label:
align (not specified) @r{align code}
@end example
+Similar to @code{align} is the next instruction, also usually used with
+a label:
+@example
+skip (not specified) @r{skip code}
+@end example
+It is used to specify a minimal number of bytes of nops to be inserted
+before the next instruction.
+
@code{label} is normally used as @code{patch_at} argument for backward
jumps.
@@ -687,6 +695,10 @@ label2 = jit_indirect(); @rem{/* second
entry point */}
assert(addr2 - addr1 == 16); @rem{/* only one of the addresses
needs to be remembered */}
@end example
+@code{skip} is useful for reserving space in the code buffer that can
+later be filled (possibly with the help of the pair of functions
+@code{jit_unprotect} and @code{jit_protect}).
+
@item Function prolog
These macros are used to set up a function prolog. The @code{allocai}
diff --git a/include/lightning.h.in b/include/lightning.h.in
index 2ed593b..c84289e 100644
--- a/include/lightning.h.in
+++ b/include/lightning.h.in
@@ -190,6 +190,8 @@ typedef enum {
#define jit_align(u) jit_new_node_w(jit_code_align, u)
jit_code_live, jit_code_align,
jit_code_save, jit_code_load,
+#define jit_skip(u) jit_new_node_w(jit_code_skip, u)
+ jit_code_skip,
#define jit_name(u) _jit_name(_jit,u)
jit_code_name,
#define jit_note(u, v) _jit_note(_jit, u, v)
diff --git a/lib/jit_aarch64-sz.c b/lib/jit_aarch64-sz.c
index b1f451f..3099d4d 100644
--- a/lib/jit_aarch64-sz.c
+++ b/lib/jit_aarch64-sz.c
@@ -6,6 +6,7 @@
4, /* align */
0, /* save */
0, /* load */
+ 0, /* skip */
0, /* #name */
0, /* #note */
0, /* label */
diff --git a/lib/jit_aarch64.c b/lib/jit_aarch64.c
index fe42004..e072788 100644
--- a/lib/jit_aarch64.c
+++ b/lib/jit_aarch64.c
@@ -1024,6 +1024,9 @@ _emit_code(jit_state_t *_jit)
if ((word = _jit->pc.w & (node->u.w - 1)))
nop(node->u.w - word);
break;
+ case jit_code_skip:
+ nop(code->u.w);
+ break;
case jit_code_note: case jit_code_name:
node->u.w = _jit->pc.w;
break;
diff --git a/lib/jit_alpha-sz.c b/lib/jit_alpha-sz.c
index ac314f2..f8e2e89 100644
--- a/lib/jit_alpha-sz.c
+++ b/lib/jit_alpha-sz.c
@@ -5,6 +5,7 @@
4, /* align */
0, /* save */
0, /* load */
+ 0, /* skip */
0, /* #name */
0, /* #note */
0, /* label */
diff --git a/lib/jit_alpha.c b/lib/jit_alpha.c
index b545365..2cf58d7 100644
--- a/lib/jit_alpha.c
+++ b/lib/jit_alpha.c
@@ -984,6 +984,9 @@ _emit_code(jit_state_t *_jit)
if ((word = _jit->pc.w & (node->u.w - 1)))
nop(node->u.w - word);
break;
+ case jit_code_skip:
+ nop(code->u.w);
+ break;
case jit_code_note: case jit_code_name:
node->u.w = _jit->pc.w;
break;
diff --git a/lib/jit_arm-sz.c b/lib/jit_arm-sz.c
index 14f085a..f0590ee 100644
--- a/lib/jit_arm-sz.c
+++ b/lib/jit_arm-sz.c
@@ -7,6 +7,7 @@
2, /* align */
0, /* save */
0, /* load */
+ 0, /* skip */
2, /* #name */
0, /* #note */
0, /* label */
diff --git a/lib/jit_arm.c b/lib/jit_arm.c
index 9d0c56f..54ab21a 100644
--- a/lib/jit_arm.c
+++ b/lib/jit_arm.c
@@ -1406,6 +1406,9 @@ _emit_code(jit_state_t *_jit)
if ((word = _jit->pc.w & (node->u.w - 1)))
nop(node->u.w - word);
break;
+ case jit_code_skip:
+ nop(node->u.w);
+ break;
case jit_code_note: case jit_code_name:
if (must_align_p(node->next))
nop(2);
diff --git a/lib/jit_hppa-sz.c b/lib/jit_hppa-sz.c
index 33ac908..2b2824d 100644
--- a/lib/jit_hppa-sz.c
+++ b/lib/jit_hppa-sz.c
@@ -6,6 +6,7 @@
0, /* align */
0, /* save */
0, /* load */
+ 0, /* skip */
0, /* #name */
0, /* #note */
0, /* label */
diff --git a/lib/jit_hppa.c b/lib/jit_hppa.c
index 788637a..06ba19d 100644
--- a/lib/jit_hppa.c
+++ b/lib/jit_hppa.c
@@ -980,6 +980,9 @@ _emit_code(jit_state_t *_jit)
if ((word = _jit->pc.w & (node->u.w - 1)))
nop(node->u.w - word);
break;
+ case jit_code_skip:
+ nop(node->u.w);
+ break;
case jit_code_note: case jit_code_name:
node->u.w = _jit->pc.w;
break;
diff --git a/lib/jit_ia64-sz.c b/lib/jit_ia64-sz.c
index e65da54..958093f 100644
--- a/lib/jit_ia64-sz.c
+++ b/lib/jit_ia64-sz.c
@@ -5,6 +5,7 @@
0, /* align */
0, /* save */
0, /* load */
+ 0, /* skip */
0, /* #name */
0, /* #note */
0, /* label */
diff --git a/lib/jit_ia64.c b/lib/jit_ia64.c
index 67251e3..5ccd136 100644
--- a/lib/jit_ia64.c
+++ b/lib/jit_ia64.c
@@ -1123,6 +1123,10 @@ _emit_code(jit_state_t *_jit)
if (node->u.w > 8)
nop(node->u.w - 8);
break;
+ case jit_code_skip:
+ sync();
+ nop(node->u.w);
+ break;
case jit_code_note: case jit_code_name:
sync();
node->u.w = _jit->pc.w;
diff --git a/lib/jit_loongarch-sz.c b/lib/jit_loongarch-sz.c
index 2490cfa..c72b259 100644
--- a/lib/jit_loongarch-sz.c
+++ b/lib/jit_loongarch-sz.c
@@ -5,6 +5,7 @@
28, /* align */
0, /* save */
0, /* load */
+ 0, /* skip */
0, /* #name */
0, /* #note */
0, /* label */
diff --git a/lib/jit_loongarch.c b/lib/jit_loongarch.c
index 436f775..bfc890a 100644
--- a/lib/jit_loongarch.c
+++ b/lib/jit_loongarch.c
@@ -1016,6 +1016,9 @@ _emit_code(jit_state_t *_jit)
if ((word = _jit->pc.w & (node->u.w - 1)))
nop(node->u.w - word);
break;
+ case jit_code_skip:
+ nop(node->u.w);
+ break;
case jit_code_note: case jit_code_name:
node->u.w = _jit->pc.w;
break;
diff --git a/lib/jit_mips-sz.c b/lib/jit_mips-sz.c
index 91deb4b..3afa3d5 100644
--- a/lib/jit_mips-sz.c
+++ b/lib/jit_mips-sz.c
@@ -7,6 +7,7 @@
0, /* align */
0, /* save */
0, /* load */
+ 0, /* skip */
0, /* #name */
0, /* #note */
0, /* label */
diff --git a/lib/jit_mips.c b/lib/jit_mips.c
index ae3974e..18296ea 100644
--- a/lib/jit_mips.c
+++ b/lib/jit_mips.c
@@ -1305,6 +1305,9 @@ _emit_code(jit_state_t *_jit)
if ((word = _jit->pc.w & (node->u.w - 1)))
nop(node->u.w - word);
break;
+ case jit_code_skip:
+ nop(node->u.w);
+ break;
case jit_code_note: case jit_code_name:
node->u.w = _jit->pc.w;
break;
diff --git a/lib/jit_names.c b/lib/jit_names.c
index b663b67..7b89a7c 100644
--- a/lib/jit_names.c
+++ b/lib/jit_names.c
@@ -21,6 +21,7 @@ static char *code_name[] = {
"data",
"live", "align",
"save", "load",
+ "skip",
"#name", "#note",
"label",
"prolog",
diff --git a/lib/jit_ppc-sz.c b/lib/jit_ppc-sz.c
index 212e637..9fbf162 100644
--- a/lib/jit_ppc-sz.c
+++ b/lib/jit_ppc-sz.c
@@ -8,6 +8,7 @@
0, /* align */
0, /* save */
0, /* load */
+ 0, /* skip */
0, /* #name */
0, /* #note */
0, /* label */
diff --git a/lib/jit_ppc.c b/lib/jit_ppc.c
index 9deaf47..379fda4 100644
--- a/lib/jit_ppc.c
+++ b/lib/jit_ppc.c
@@ -1294,6 +1294,9 @@ _emit_code(jit_state_t *_jit)
if ((word = _jit->pc.w & (node->u.w - 1)))
nop(node->u.w - word);
break;
+ case jit_code_skip:
+ nop(node->u.w);
+ break;
case jit_code_note: case jit_code_name:
node->u.w = _jit->pc.w;
break;
diff --git a/lib/jit_riscv-sz.c b/lib/jit_riscv-sz.c
index 8c4cf04..e25501d 100644
--- a/lib/jit_riscv-sz.c
+++ b/lib/jit_riscv-sz.c
@@ -5,6 +5,7 @@
4, /* align */
0, /* save */
0, /* load */
+ 0, /* skip */
0, /* #name */
0, /* #note */
0, /* label */
diff --git a/lib/jit_riscv.c b/lib/jit_riscv.c
index 8ccb09f..317f0f3 100644
--- a/lib/jit_riscv.c
+++ b/lib/jit_riscv.c
@@ -1067,6 +1067,9 @@ _emit_code(jit_state_t *_jit)
if ((word = _jit->pc.w & (node->u.w - 1)))
nop(node->u.w - word);
break;
+ case jit_code_skip:
+ nop(node->u.w);
+ break;
case jit_code_note: case jit_code_name:
node->u.w = _jit->pc.w;
break;
diff --git a/lib/jit_s390-sz.c b/lib/jit_s390-sz.c
index e70c65f..6f97eea 100644
--- a/lib/jit_s390-sz.c
+++ b/lib/jit_s390-sz.c
@@ -6,6 +6,7 @@
2, /* align */
0, /* save */
0, /* load */
+ 0, /* skip */
0, /* #name */
0, /* #note */
2, /* label */
diff --git a/lib/jit_s390.c b/lib/jit_s390.c
index 547913b..53475ca 100644
--- a/lib/jit_s390.c
+++ b/lib/jit_s390.c
@@ -1033,6 +1033,9 @@ _emit_code(jit_state_t *_jit)
if ((word = _jit->pc.w & (node->u.w - 1)))
nop(node->u.w - word);
break;
+ case jit_code_skip:
+ nop(node->u.w);
+ break;
case jit_code_note: case jit_code_name:
node->u.w = _jit->pc.w;
break;
diff --git a/lib/jit_size.c b/lib/jit_size.c
index b3e1cae..f7d50e1 100644
--- a/lib/jit_size.c
+++ b/lib/jit_size.c
@@ -121,7 +121,15 @@ _jit_get_size(jit_state_t *_jit)
break;
}
# endif
- size += _szs[node->code];
+ switch (node->code) {
+ /* The instructions are special because they can be arbitrarily
long. */
+ case jit_code_align:
+ case jit_code_skip:
+ size += node->u.w;
+ break;
+ default:
+ size += _szs[node->code];
+ }
}
# if __riscv && __WORDSIZE == 64
/* Heuristically only 20% of constants are unique. */
diff --git a/lib/jit_sparc-sz.c b/lib/jit_sparc-sz.c
index 265769d..4d95dfa 100644
--- a/lib/jit_sparc-sz.c
+++ b/lib/jit_sparc-sz.c
@@ -5,6 +5,7 @@
0, /* align */
0, /* save */
0, /* load */
+ 0, /* skip */
0, /* #name */
0, /* #note */
0, /* label */
diff --git a/lib/jit_sparc.c b/lib/jit_sparc.c
index 33cc9bd..10de59c 100644
--- a/lib/jit_sparc.c
+++ b/lib/jit_sparc.c
@@ -1327,6 +1327,9 @@ _emit_code(jit_state_t *_jit)
if ((word = _jit->pc.w & (node->u.w - 1)))
nop(node->u.w - word);
break;
+ case jit_code_skip:
+ nop(code->u.w);
+ break;
case jit_code_note: case jit_code_name:
node->u.w = _jit->pc.w;
break;
diff --git a/lib/jit_x86-sz.c b/lib/jit_x86-sz.c
index eb668b3..bd8deaf 100644
--- a/lib/jit_x86-sz.c
+++ b/lib/jit_x86-sz.c
@@ -6,6 +6,7 @@
3, /* align */
0, /* save */
0, /* load */
+ 0, /* skip */
0, /* #name */
0, /* #note */
3, /* label */
@@ -416,6 +417,7 @@
6, /* align */
0, /* save */
0, /* load */
+ 0, /* skip */
0, /* #name */
0, /* #note */
7, /* label */
@@ -825,6 +827,7 @@
3, /* align */
0, /* save */
0, /* load */
+ 0, /* skip */
0, /* #name */
0, /* #note */
3, /* label */
@@ -1233,6 +1236,7 @@
6, /* align */
0, /* save */
0, /* load */
+ 0, /* skip */
0, /* #name */
0, /* #note */
7, /* label */
diff --git a/lib/jit_x86.c b/lib/jit_x86.c
index e1b22be..489f8a4 100644
--- a/lib/jit_x86.c
+++ b/lib/jit_x86.c
@@ -1599,7 +1599,10 @@ _emit_code(jit_state_t *_jit)
if ((word = _jit->pc.w & (node->u.w - 1)))
nop(node->u.w - word);
break;
- case jit_code_note: case jit_code_name:
+ case jit_code_skip:
+ nop(node->u.w);
+ break;
+ case jit_code_note: case jit_code_name:
node->u.w = _jit->pc.w;
break;
case jit_code_label:
diff --git a/lib/lightning.c b/lib/lightning.c
index b308844..e98f29e 100644
--- a/lib/lightning.c
+++ b/lib/lightning.c
@@ -1360,7 +1360,8 @@ _jit_classify(jit_state_t *_jit, jit_code_t code)
mask = jit_cc_a0_reg;
break;
case jit_code_align: case jit_code_reti: case jit_code_pushargi:
- case jit_code_finishi: /* synthesized will set jit_cc_a0_jmp */
+ case jit_code_skip:
+ case jit_code_finishi: /* synthesized will set jit_cc_a0_jmp */
mask = jit_cc_a0_int;
break;
case jit_code_reti_f: case jit_code_pushargi_f:
--
2.34.1
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- [PATCH 2/2] Add new skip instruction.,
marc . nieper+gnu <=