File 1504-Clean-up-the-bs_init-helpers-and-instructi... of Package erlang

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File 1504-Clean-up-the-bs_init-helpers-and-instructions.patch of Package erlang (Revision 75e053fb70ae9038cf6513f776cd662d)

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From 16c5728f442b51caca42bcd827a2058051ef8733 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Bj=C3=B6rn=20Gustavsson?= <bjorn@erlang.org>
Date: Sun, 10 Oct 2021 08:40:29 +0200
Subject: [PATCH 4/6] Clean up the bs_init* helpers and instructions

Eliminate uncessary gotos. Always test the virtual binary heap when
deciding whether a GC is needed (it is currently only done for
binaries whose size are given in bytes).
---
 erts/emulator/beam/emu/bs_instrs.tab       | 56 +++++++--------
 erts/emulator/beam/jit/beam_jit_common.cpp | 80 +++++++++++-----------
 erts/emulator/beam/jit/beam_jit_common.hpp |  4 +-
 3 files changed, 68 insertions(+), 72 deletions(-)

diff --git a/erts/emulator/beam/emu/bs_instrs.tab b/erts/emulator/beam/emu/bs_instrs.tab
index 305b2d6312..a5e6bb46de 100644
--- a/erts/emulator/beam/emu/bs_instrs.tab
+++ b/erts/emulator/beam/emu/bs_instrs.tab
@@ -426,13 +426,14 @@ bs_init.verify(Fail) {
 }
 
 bs_init.execute(Live, Dst) {
+    erts_bin_offset = 0;
+    erts_writable_bin = 0;
+
     if (BsOp1 <= ERL_ONHEAP_BIN_LIMIT) {
         ErlHeapBin* hb;
         Uint bin_need;
 
         bin_need = heap_bin_size(BsOp1);
-        erts_bin_offset = 0;
-        erts_writable_bin = 0;
         $GC_TEST(0, bin_need+BsOp2+ERL_SUB_BIN_SIZE, $Live);
         hb = (ErlHeapBin *) HTOP;
         HTOP += bin_need;
@@ -444,10 +445,7 @@ bs_init.execute(Live, Dst) {
         Binary* bptr;
         ProcBin* pb;
 
-        erts_bin_offset = 0;
-        erts_writable_bin = 0;
-        $TEST_BIN_VHEAP(BsOp1 / sizeof(Eterm),
-                        BsOp2 + PROC_BIN_SIZE + ERL_SUB_BIN_SIZE, $Live);
+        $TEST_BIN_VHEAP(BsOp1 / sizeof(Eterm), BsOp2 + PROC_BIN_SIZE, $Live);
 
         /*
          * Allocate the binary struct itself.
@@ -539,7 +537,9 @@ bs_init_bits.execute(Live, Dst) {
      } else {
 	 alloc += PROC_BIN_SIZE;
      }
-     $test_heap(alloc, $Live);
+
+     erts_bin_offset = 0;
+     erts_writable_bin = 0;
 
      /* num_bits = Number of bits to build
       * num_bytes = Number of bytes to allocate in the binary
@@ -549,38 +549,18 @@ bs_init_bits.execute(Live, Dst) {
      if (num_bytes <= ERL_ONHEAP_BIN_LIMIT) {
 	 ErlHeapBin* hb;
 
-	 erts_bin_offset = 0;
-	 erts_writable_bin = 0;
+         $test_heap(alloc, $Live);
 	 hb = (ErlHeapBin *) HTOP;
 	 HTOP += heap_bin_size(num_bytes);
 	 hb->thing_word = header_heap_bin(num_bytes);
 	 hb->size = num_bytes;
 	 erts_current_bin = (byte *) hb->data;
 	 new_binary = make_binary(hb);
-
-     do_bits_sub_bin:
-	 if (num_bits & 7) {
-	     ErlSubBin* sb;
-
-	     sb = (ErlSubBin *) HTOP;
-	     HTOP += ERL_SUB_BIN_SIZE;
-	     sb->thing_word = HEADER_SUB_BIN;
-	     sb->size = num_bytes - 1;
-	     sb->bitsize = num_bits & 7;
-	     sb->offs = 0;
-	     sb->bitoffs = 0;
-	     sb->is_writable = 0;
-	     sb->orig = new_binary;
-	     new_binary = make_binary(sb);
-	 }
-	 HEAP_SPACE_VERIFIED(0);
-         $Dst = new_binary;
      } else {
 	 Binary* bptr;
 	 ProcBin* pb;
 
-	 erts_bin_offset = 0;
-	 erts_writable_bin = 0;
+         $TEST_BIN_VHEAP(num_bytes / sizeof(Eterm), alloc, $Live);
 
 	 /*
 	  * Allocate the binary struct itself.
@@ -602,8 +582,24 @@ bs_init_bits.execute(Live, Dst) {
 	 pb->flags = 0;
 	 OH_OVERHEAD(&(MSO(c_p)), pb->size / sizeof(Eterm));
 	 new_binary = make_binary(pb);
-	 goto do_bits_sub_bin;
      }
+
+     if (num_bits & 7) {
+         ErlSubBin* sb;
+
+         sb = (ErlSubBin *) HTOP;
+         HTOP += ERL_SUB_BIN_SIZE;
+         sb->thing_word = HEADER_SUB_BIN;
+         sb->size = num_bytes - 1;
+         sb->bitsize = num_bits & 7;
+         sb->offs = 0;
+         sb->bitoffs = 0;
+         sb->is_writable = 0;
+         sb->orig = new_binary;
+         new_binary = make_binary(sb);
+     }
+     HEAP_SPACE_VERIFIED(0);
+     $Dst = new_binary;
 }
 
 bs_add(Fail, Src1, Src2, Unit, Dst) {
diff --git a/erts/emulator/beam/jit/beam_jit_common.cpp b/erts/emulator/beam/jit/beam_jit_common.cpp
index c372bcea2c..b1a43206d8 100644
--- a/erts/emulator/beam/jit/beam_jit_common.cpp
+++ b/erts/emulator/beam/jit/beam_jit_common.cpp
@@ -572,39 +572,37 @@ void beam_jit_bs_add_argument_error(Process *c_p, Eterm A, Eterm B) {
 Eterm beam_jit_bs_init(Process *c_p,
                        Eterm *reg,
                        ERL_BITS_DECLARE_STATEP,
-                       Eterm BsOp1,
-                       Eterm BsOp2,
+                       Eterm num_bytes,
+                       Uint alloc,
                        unsigned Live) {
-    if (BsOp1 <= ERL_ONHEAP_BIN_LIMIT) {
+    erts_bin_offset = 0;
+    erts_writable_bin = 0;
+    if (num_bytes <= ERL_ONHEAP_BIN_LIMIT) {
         ErlHeapBin *hb;
         Uint bin_need;
 
-        bin_need = heap_bin_size(BsOp1);
-        erts_bin_offset = 0;
-        erts_writable_bin = 0;
-        gc_test(c_p, reg, 0, bin_need + BsOp2 + ERL_SUB_BIN_SIZE, Live);
+        bin_need = heap_bin_size(num_bytes);
+        gc_test(c_p, reg, 0, bin_need + alloc + ERL_SUB_BIN_SIZE, Live);
         hb = (ErlHeapBin *)c_p->htop;
         c_p->htop += bin_need;
-        hb->thing_word = header_heap_bin(BsOp1);
-        hb->size = BsOp1;
+        hb->thing_word = header_heap_bin(num_bytes);
+        hb->size = num_bytes;
         erts_current_bin = (byte *)hb->data;
         return make_binary(hb);
     } else {
         Binary *bptr;
         ProcBin *pb;
 
-        erts_bin_offset = 0;
-        erts_writable_bin = 0;
         test_bin_vheap(c_p,
                        reg,
-                       BsOp1 / sizeof(Eterm),
-                       BsOp2 + PROC_BIN_SIZE + ERL_SUB_BIN_SIZE,
+                       num_bytes / sizeof(Eterm),
+                       alloc + PROC_BIN_SIZE,
                        Live);
 
         /*
          * Allocate the binary struct itself.
          */
-        bptr = erts_bin_nrml_alloc(BsOp1);
+        bptr = erts_bin_nrml_alloc(num_bytes);
         erts_current_bin = (byte *)bptr->orig_bytes;
 
         /*
@@ -613,14 +611,14 @@ Eterm beam_jit_bs_init(Process *c_p,
         pb = (ProcBin *)c_p->htop;
         c_p->htop += PROC_BIN_SIZE;
         pb->thing_word = HEADER_PROC_BIN;
-        pb->size = BsOp1;
+        pb->size = num_bytes;
         pb->next = MSO(c_p).first;
         MSO(c_p).first = (struct erl_off_heap_header *)pb;
         pb->val = bptr;
         pb->bytes = (byte *)bptr->orig_bytes;
         pb->flags = 0;
 
-        OH_OVERHEAD(&(MSO(c_p)), BsOp1 / sizeof(Eterm));
+        OH_OVERHEAD(&(MSO(c_p)), num_bytes / sizeof(Eterm));
 
         return make_binary(pb);
     }
@@ -643,7 +641,9 @@ Eterm beam_jit_bs_init_bits(Process *c_p,
     } else {
         alloc += PROC_BIN_SIZE;
     }
-    gc_test(c_p, reg, 0, alloc, Live);
+
+    erts_bin_offset = 0;
+    erts_writable_bin = 0;
 
     /* num_bits = Number of bits to build
      * num_bytes = Number of bytes to allocate in the binary
@@ -653,38 +653,22 @@ Eterm beam_jit_bs_init_bits(Process *c_p,
     if (num_bytes <= ERL_ONHEAP_BIN_LIMIT) {
         ErlHeapBin *hb;
 
-        erts_bin_offset = 0;
-        erts_writable_bin = 0;
+        gc_test(c_p, reg, 0, alloc, Live);
         hb = (ErlHeapBin *)c_p->htop;
         c_p->htop += heap_bin_size(num_bytes);
         hb->thing_word = header_heap_bin(num_bytes);
         hb->size = num_bytes;
         erts_current_bin = (byte *)hb->data;
         new_binary = make_binary(hb);
-
-    do_bits_sub_bin:
-        if (num_bits & 7) {
-            ErlSubBin *sb;
-
-            sb = (ErlSubBin *)c_p->htop;
-            c_p->htop += ERL_SUB_BIN_SIZE;
-            sb->thing_word = HEADER_SUB_BIN;
-            sb->size = num_bytes - 1;
-            sb->bitsize = num_bits & 7;
-            sb->offs = 0;
-            sb->bitoffs = 0;
-            sb->is_writable = 0;
-            sb->orig = new_binary;
-            new_binary = make_binary(sb);
-        }
-        /*    HEAP_SPACE_VERIFIED(0); */
-        return new_binary;
     } else {
         Binary *bptr;
         ProcBin *pb;
 
-        erts_bin_offset = 0;
-        erts_writable_bin = 0;
+        test_bin_vheap(c_p,
+                       reg,
+                       num_bytes / sizeof(Eterm),
+                       alloc,
+                       Live);
 
         /*
          * Allocate the binary struct itself.
@@ -706,8 +690,24 @@ Eterm beam_jit_bs_init_bits(Process *c_p,
         pb->flags = 0;
         OH_OVERHEAD(&(MSO(c_p)), pb->size / sizeof(Eterm));
         new_binary = make_binary(pb);
-        goto do_bits_sub_bin;
     }
+
+    if (num_bits & 7) {
+        ErlSubBin *sb;
+
+        sb = (ErlSubBin *)c_p->htop;
+        c_p->htop += ERL_SUB_BIN_SIZE;
+        sb->thing_word = HEADER_SUB_BIN;
+        sb->size = num_bytes - 1;
+        sb->bitsize = num_bits & 7;
+        sb->offs = 0;
+        sb->bitoffs = 0;
+        sb->is_writable = 0;
+        sb->orig = new_binary;
+        new_binary = make_binary(sb);
+    }
+
+    return new_binary;
 }
 
 Eterm beam_jit_bs_get_integer(Process *c_p,
diff --git a/erts/emulator/beam/jit/beam_jit_common.hpp b/erts/emulator/beam/jit/beam_jit_common.hpp
index ca73395006..8db8c95eac 100644
--- a/erts/emulator/beam/jit/beam_jit_common.hpp
+++ b/erts/emulator/beam/jit/beam_jit_common.hpp
@@ -269,8 +269,8 @@ void beam_jit_bs_add_argument_error(Process *c_p, Eterm A, Eterm B);
 Eterm beam_jit_bs_init(Process *c_p,
                        Eterm *reg,
                        ERL_BITS_DECLARE_STATEP,
-                       Eterm BsOp1,
-                       Eterm BsOp2,
+                       Eterm num_bytes,
+                       Uint alloc,
                        unsigned Live);
 Eterm beam_jit_bs_init_bits(Process *c_p,
                             Eterm *reg,
-- 
2.31.1

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File 1504-Clean-up-the-bs_init-helpers-and-instructions.patch of Package erlang (Revision 75e053fb70ae9038cf6513f776cd662d)

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