M2-Planet: floating point exceptions

[Jan Nieuwenhuizen]

Hello!

Trying to build the `wip-m2' branch of GNU Mes with latest M2-Planet,
I'm seeing stray nondeterministic floating point exceptions when
compiling mes using mescc with an M2-Planet-compiled mes: recompilation
of a file often succeeds, but I haven't seen a build fully succeed in
one go.

Bisecting M2-Planet indicates

    64a3a1b6740ea027ca04b866270431d57ae89cb6
    Get division on x86/AMD64 a closer approximation of what is correct

to be the problematic commit.  I created a "reproducer": bug.c (see
attached).  I'm not sure this is actually the case that I'm seeing
(wondering about the nondeterminism), but sadly I cannot run gdb on
M2-Planet-built mes; I'm getting:

--8<---------------cut here---------------start------------->8---
$ gdb bin/mes-m2
GNU gdb (GDB) 10.1
[..]
BFD: warning: /home/janneke/src/mes/wip-m2/bin/mes-m2 has a section extending 
past end of file
BFD: warning: /home/janneke/src/mes/wip-m2/bin/mes-m2 has a section extending 
past end of file
"0x7ffeec229a90s": not in executable format: file format not recognized
--8<---------------cut here---------------end--------------->8---

...hmm?  Anyway, running bug.sh gives:

--8<---------------cut here---------------start------------->8---
14:15:24 janneke@dundal:~/src/m2-planet [env]
$ sh -ex bug.sh
+ mkdir -p m2
+ bin/M2-Planet --debug --architecture x86 -o bug.M1 -f bug.c
+ blood-elf -f bug.M1 -o bug.blood-elf-M1
+ M1 --LittleEndian --architecture x86 -f test/common_x86/x86_defs.M1 -f 
test/common_x86/libc-core.M1 -f bug.M1 -f bug.blood-elf-M1 -o bug.hex2
+ hex2 --LittleEndian --architecture x86 --BaseAddress 0x1000000 --exec_enable 
-f test/common_x86/ELF-i386.hex2 -f bug.hex2 -o bug
+ echo Running bug
Running bug
+ ./bug
bug.sh: line 31:  7541 Floating point exception./bug
[136]14:15:52 janneke@dundal:~/src/m2-planet [env]
$ 
--8<---------------cut here---------------end--------------->8---

Reverting this commit (see attached patch) indeed makes the bug go away,
and mes can be bootstrapped again.

Bugs are hugs, happy New Year!
Greetings,
Janneke

bug.c
Description: Binary data

bug.sh
Description: Bourne shell script

>From aa93ad0256ef7ed5947ee0489ddd24137523e4ca Mon Sep 17 00:00:00 2001
From: "Jan (janneke) Nieuwenhuizen" <janneke@gnu.org>
Date: Fri, 1 Jan 2021 13:40:16 +0100
Subject: [PATCH] Revert "Get division on x86/AMD64 a closer approximation of
 what is correct"
Content-Transfer-Encoding: 8bit
Content-Type: text/plain; charset=UTF-8

This avoids floating point exception when building GNU Mes: wip-m2, or
doing "int i = i / 1;".

This reverts commit 64a3a1b6740ea027ca04b866270431d57ae89cb6.
---
 cc_core.c                       | 16 +++++++-------
 test/common_amd64/amd64_defs.M1 |  1 -
 test/common_x86/x86_defs.M1     |  1 -
 test/test.answers               | 38 ++++++++++++++++-----------------
 test/test1000/proof.answer      |  2 +-
 5 files changed, 28 insertions(+), 30 deletions(-)

diff --git a/cc_core.c b/cc_core.c
index 74a90f3..ed4a1c3 100644
--- a/cc_core.c
+++ b/cc_core.c
@@ -854,20 +854,20 @@ void additive_expr_stub()
                arithmetic_recursion(postfix_expr, "ADD_ebx_to_eax\n", 
"ADD_ebx_to_eax\n", "+", additive_expr_stub);
                arithmetic_recursion(postfix_expr, 
"SUBTRACT_eax_from_ebx_into_ebx\nMOVE_ebx_to_eax\n", 
"SUBTRACT_eax_from_ebx_into_ebx\nMOVE_ebx_to_eax\n", "-", additive_expr_stub);
                arithmetic_recursion(postfix_expr, 
"MULTIPLYS_eax_by_ebx_into_eax\n", "MULTIPLY_eax_by_ebx_into_eax\n", "*", 
additive_expr_stub);
-               arithmetic_recursion(postfix_expr, 
"XCHG_eax_ebx\nCDTQ\nDIVIDES_eax_by_ebx_into_eax\n", 
"XCHG_eax_ebx\nLOAD_IMMEDIATE_edx %0\nDIVIDE_eax_by_ebx_into_eax\n", "/", 
additive_expr_stub);
-               arithmetic_recursion(postfix_expr, 
"XCHG_eax_ebx\nCDTQ\nMODULUSS_eax_from_ebx_into_ebx\nMOVE_edx_to_eax\n", 
"XCHG_eax_ebx\nCDTQ\nMODULUS_eax_from_ebx_into_ebx\nMOVE_edx_to_eax\n", "%", 
additive_expr_stub);
-               arithmetic_recursion(postfix_expr, 
"COPY_eax_to_ecx\nCOPY_ebx_to_eax\nSAL_eax_cl\n", 
"COPY_eax_to_ecx\nCOPY_ebx_to_eax\nSHL_eax_cl\n", "<<", additive_expr_stub);
-               arithmetic_recursion(postfix_expr, 
"COPY_eax_to_ecx\nCOPY_ebx_to_eax\nSAR_eax_cl\n", 
"COPY_eax_to_ecx\nCOPY_ebx_to_eax\nSHR_eax_cl\n", ">>", additive_expr_stub);
+               arithmetic_recursion(postfix_expr, 
"XCHG_eax_ebx\nLOAD_IMMEDIATE_edx %0\nDIVIDES_eax_by_ebx_into_eax\n", 
"XCHG_eax_ebx\nLOAD_IMMEDIATE_edx %0\nDIVIDE_eax_by_ebx_into_eax\n", "/", 
additive_expr_stub);
+               arithmetic_recursion(postfix_expr, 
"XCHG_eax_ebx\nLOAD_IMMEDIATE_edx 
%0\nMODULUSS_eax_from_ebx_into_ebx\nMOVE_edx_to_eax\n", 
"XCHG_eax_ebx\nLOAD_IMMEDIATE_edx 
%0\nMODULUS_eax_from_ebx_into_ebx\nMOVE_edx_to_eax\n", "%", additive_expr_stub);
+               arithmetic_recursion(postfix_expr, 
"COPY_eax_to_ecx\nCOPY_ebx_to_eax\nSAL_eax_cl\n", 
"COPY_eax_to_ecx\nCOPY_ebx_to_eax\nSAL_eax_cl\n", "<<", additive_expr_stub);
+               arithmetic_recursion(postfix_expr, 
"COPY_eax_to_ecx\nCOPY_ebx_to_eax\nSAR_eax_cl\n", 
"COPY_eax_to_ecx\nCOPY_ebx_to_eax\nSAR_eax_cl\n", ">>", additive_expr_stub);
        }
        else if(AMD64 == Architecture)
        {
                arithmetic_recursion(postfix_expr, "ADD_rbx_to_rax\n", 
"ADD_rbx_to_rax\n", "+", additive_expr_stub);
                arithmetic_recursion(postfix_expr, 
"SUBTRACT_rax_from_rbx_into_rbx\nMOVE_rbx_to_rax\n", 
"SUBTRACT_rax_from_rbx_into_rbx\nMOVE_rbx_to_rax\n", "-", additive_expr_stub);
                arithmetic_recursion(postfix_expr, 
"MULTIPLYS_rax_by_rbx_into_rax\n", "MULTIPLY_rax_by_rbx_into_rax\n", "*", 
additive_expr_stub);
-               arithmetic_recursion(postfix_expr, 
"XCHG_rax_rbx\nCQTO\nDIVIDES_rax_by_rbx_into_rax\n", 
"XCHG_rax_rbx\nLOAD_IMMEDIATE_rdx %0\nDIVIDE_rax_by_rbx_into_rax\n", "/", 
additive_expr_stub);
-               arithmetic_recursion(postfix_expr, 
"XCHG_rax_rbx\nCQTO\nMODULUSS_rax_from_rbx_into_rbx\nMOVE_rdx_to_rax\n", 
"XCHG_rax_rbx\nCQTO\nMODULUS_rax_from_rbx_into_rbx\nMOVE_rdx_to_rax\n", "%", 
additive_expr_stub);
-               arithmetic_recursion(postfix_expr, 
"COPY_rax_to_rcx\nCOPY_rbx_to_rax\nSAL_rax_cl\n", 
"COPY_rax_to_rcx\nCOPY_rbx_to_rax\nSHL_rax_cl\n", "<<", additive_expr_stub);
-               arithmetic_recursion(postfix_expr, 
"COPY_rax_to_rcx\nCOPY_rbx_to_rax\nSAR_rax_cl\n", 
"COPY_rax_to_rcx\nCOPY_rbx_to_rax\nSHR_rax_cl\n", ">>", additive_expr_stub);
+               arithmetic_recursion(postfix_expr, 
"XCHG_rax_rbx\nLOAD_IMMEDIATE_rdx %0\nDIVIDES_rax_by_rbx_into_rax\n", 
"XCHG_rax_rbx\nLOAD_IMMEDIATE_rdx %0\nDIVIDE_rax_by_rbx_into_rax\n", "/", 
additive_expr_stub);
+               arithmetic_recursion(postfix_expr, 
"XCHG_rax_rbx\nLOAD_IMMEDIATE_rdx 
%0\nMODULUSS_rax_from_rbx_into_rbx\nMOVE_rdx_to_rax\n", 
"XCHG_rax_rbx\nLOAD_IMMEDIATE_rdx 
%0\nMODULUS_rax_from_rbx_into_rbx\nMOVE_rdx_to_rax\n", "%", additive_expr_stub);
+               arithmetic_recursion(postfix_expr, 
"COPY_rax_to_rcx\nCOPY_rbx_to_rax\nSAL_rax_cl\n", 
"COPY_rax_to_rcx\nCOPY_rbx_to_rax\nSAL_rax_cl\n", "<<", additive_expr_stub);
+               arithmetic_recursion(postfix_expr, 
"COPY_rax_to_rcx\nCOPY_rbx_to_rax\nSAR_rax_cl\n", 
"COPY_rax_to_rcx\nCOPY_rbx_to_rax\nSAR_rax_cl\n", ">>", additive_expr_stub);
        }
        else if(ARMV7L == Architecture)
        {
diff --git a/test/common_amd64/amd64_defs.M1 b/test/common_amd64/amd64_defs.M1
index fcce816..d458797 100644
--- a/test/common_amd64/amd64_defs.M1
+++ b/test/common_amd64/amd64_defs.M1
@@ -32,7 +32,6 @@ DEFINE COPY_rbx_to_rdi 4889DF
 DEFINE COPY_rdi_to_rbp 4889FD
 DEFINE COPY_rsp_to_rbp 4889E5
 DEFINE COPY_RSP_to_RDI 4889E7
-DEFINE CQTO 4899
 DEFINE DIVIDE_rax_by_rbx_into_rax 48F7FB
 DEFINE DIVIDES_rax_by_rbx_into_rax 48F7F3
 DEFINE JUMP E9
diff --git a/test/common_x86/x86_defs.M1 b/test/common_x86/x86_defs.M1
index c87d4c4..ce118a6 100644
--- a/test/common_x86/x86_defs.M1
+++ b/test/common_x86/x86_defs.M1
@@ -34,7 +34,6 @@ DEFINE COPY_edi_to_ebp 89fd
 DEFINE COPY_esp_to_ebp 89E5
 DEFINE COPY_esp_to_ecx 89E1
 DEFINE COPY_esp_to_edi 89E7
-DEFINE CDTQ 99
 DEFINE DIVIDE_eax_by_ebx_into_eax F7FB
 DEFINE DIVIDES_eax_by_ebx_into_eax F7F3
 DEFINE INT_80 CD80
diff --git a/test/test.answers b/test/test.answers
index faf1881..d694829 100644
--- a/test/test.answers
+++ b/test/test.answers
@@ -104,16 +104,16 @@ 
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test/results/test0019-armv7l-binary
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test/results/test0019-knight-posix-binary
-02eeb3b8d55d2919ff9ec200b3992e3e64116863acc4951799a1c6263fd14e64  
test/results/test0019-x86-binary
+7becebf87d41c2a374195163446b02231c2705829091e1e1c7947ba5621b9144  
test/results/test0019-x86-binary
 6b31e8ee54270d38a1801f7614ae6247f59d44a2758f344b07a72794019290f4  
test/results/test0020-aarch64-binary
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 b29aca7f0b63659915fe431e290f821cf17071983613021aacb8985d376bb206  
test/results/test0020-armv7l-binary
@@ -126,10 +126,10 @@ 
a9c09864fd326b9b42bc5a32dc32d248dbfcfa87ccdd97cfd21ee95af39a3db9  test/results/t
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@@ -141,36 +141,36 @@ 
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-0cc7d8bd6b40bcb6f3b694ab3674377b76f1b2692ee7946a39a7d4e33feebc69  
test/results/test1000-x86-binary
+0819c0181f25ca52388d108de0d78487295e3929535c4ff00d01675024120f12  
test/results/test1000-aarch64-binary
+f29612c89eb9aab489414bbdfacd841da9952a11c2686c5680b9880f7cdba28e  
test/results/test1000-amd64-binary
+c2bcb184f1f438e4fa86488992ade1bdb7006b608f959f8b08bba32f968f2bd2  
test/results/test1000-armv7l-binary
+70b6f527ddaf3e5cd69024f85691434333a791f0841ac3cb1a494a0c34532cf6  
test/results/test1000-knight-posix-binary
+7ce4393f6f8824ff0db00eb8f05321425dd89b7c3b27b0c092d539686653ca22  
test/results/test1000-x86-binary
diff --git a/test/test1000/proof.answer b/test/test1000/proof.answer
index ddf173f..e965c09 100644
--- a/test/test1000/proof.answer
+++ b/test/test1000/proof.answer
@@ -1 +1 @@
-fce731f1c0914873c1d882c45fa7c606673e923504b40812231c282a02cfddd9  
test/test1000/proof
+e7c6b71cec16be685d7d551c0c0234754452577f663d95c4afd686a7835dbcb9  
test/test1000/proof
-- 
Jan Nieuwenhuizen <janneke@gnu.org> | GNU LilyPond http://lilypond.org
Freelance IT http://JoyofSource.com | Avatar® http://AvatarAcademy.com

-- 
Jan Nieuwenhuizen <janneke@gnu.org> | GNU LilyPond http://lilypond.org
Freelance IT http://JoyofSource.com | Avatar® http://AvatarAcademy.com