<table border="1" cellspacing="0" cellpadding="8">
<tr>
<th>Issue</th>
<td>
<a href=https://github.com/llvm/llvm-project/issues/82744>82744</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>
condition jump instruction seems lost when optimization opened with -O1 or -O2 or -Oz
</td>
</tr>
<tr>
<th>Labels</th>
<td>
new issue
</td>
</tr>
<tr>
<th>Assignees</th>
<td>
</td>
</tr>
<tr>
<th>Reporter</th>
<td>
haifengdeng
</td>
</tr>
</table>
<pre>
### when i use below command to compile ffmpeg4.3.1 libavformat/utils.c with clang14 on Macmini M1 MacOS14.3.1:
`
/opt/homebrew/opt/llvm@14/bin/clang -I. -I./ --sysroot=/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS17.2.sdk -D_ISOC99_SOURCE -D_LARGEFILE_SOURCE -I./compat/dispatch_semaphore -DPIC -DZLIB_CONST -DHAVE_AV_CONFIG_H -DBUILDING_avformat -isysroot /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS17.2.sdk -arch arm64 -mios-version-min=11.0 -no-canonical-prefixes -Wno-invalid-command-line-argument -Wno-unused-command-line-argument -funwind-tables -fstack-protector-strong -fno-addrsig -Werror=return-type -Werror=int-to-pointer-cast -Werror=implicit-function-declaration -fPIC -DTARGET_OS_IPHONE=1 -Wall -pipe -std=c99 -ffast-math -g -O0 -DDEBUG_ENABLE -I/Users/yue/gitlab/libaveditor_6/buildbin_ios/tmp/arm64/include -std=c11 -Werror=partial-availability -fomit-frame-pointer -fPIC -pthread -DX264_API_IMPORTS -I/opt/homebrew/Cellar/x264/r3108/include -ggdb -Wdeclaration-after-statement -Wall -Wdisabled-optimization -Wpointer-arith -Wredundant-decls -Wwrite-strings -Wtype-limits -Wundef -Wmissing-prototypes -Wno-pointer-to-int-cast -Wstrict-prototypes -Wempty-body -Wno-parentheses -Wno-switch -Wno-format-zero-length -Wno-pointer-sign -Wno-unused-const-variable -Wno-bool-operation -Wno-char-subscripts -Oz -fno-math-errno -fno-signed-zeros -mstack-alignment=16 -Qunused-arguments -Werror=implicit-function-declaration -Werror=missing-prototypes -Werror=return-type -MMD -MF libavformat/utils.d -MT libavformat/utils.o -c -o libavformat/utils.o libavformat/utils.c
`
### then i disassembly like below：
`/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/objdump -S libavformat/utils.o > utils14.txt`
### i found code "if (st->index_entries) {" in function "ff_seek_frame_binary" compiled like below, when i run to here, it always crash:
; av_log(s, AV_LOG_TRACE, "read_seek: %d %s\n", stream_index, av_ts2str(target_ts));
2b00: 4f00e400 movi.16b v0, #0
2b04: ad0403e0 stp q0, q0, [sp, #128]
2b08: 910203f4 add x20, sp, #128
2b0c: 910203e0 add x0, sp, #128
2b10: aa0203e1 mov x1, x2
2b14: 94000000 bl 0x2b14 <_ff_seek_frame_binary+0x5c>
2b18: a90053f7 stp x23, x20, [sp]
2b1c: 90000002 adrp x2, 0x2000 <_ff_seek_frame_binary+0x64>
2b20: 91000042 add x2, x2, #0
2b24: 94000000 bl 0x2b24 <_ff_seek_frame_binary+0x6c>
; st = s->streams[stream_index];
2b28: f9401a68 ldr x8, [x19, #48]
2b2c: f8775914 ldr x20, [x8, w23, uxtw #3]
**; if (st->index_entries) {
2b30: f940e69a ldr x26, [x20, #456]**
; flags | AVSEEK_FLAG_BACKWARD);
2b34: 320002c2 orr w2, w22, #0x1
2b38: 94000000 bl 0x2b38 <_ff_seek_frame_binary+0x80>
; index = FFMAX(index, 0);
2b3c: 0aa07c08 bic w8, w0, w0, asr #31
; if (e->timestamp <= target_ts || e->pos == e->min_distance) {
2b40: 52800309 mov w9, #24
2b44: 9ba96909 umaddl x9, w8, w9, x26
2b48: a9406139 ldp x25, x24, [x9]
2b4c: eb15031f cmp x24, x21
2b50: 540000cd b.le 0x2b68 <_ff_seek_frame_binary+0xb0>
2b54: 52800309 mov w9, #24
; if (e->timestamp <= target_ts || e->pos == e->min_distance) {
### but when i use clang13 with same compile command , it generate code below:
; av_log(s, AV_LOG_TRACE, "read_seek: %d %s\n", stream_index, av_ts2str(target_ts));
2b14: 4f00e400 movi.16b v0, #0
2b18: ad0383e0 stp q0, q0, [sp, #112]
2b1c: 9101c3f4 add x20, sp, #112
2b20: 9101c3e0 add x0, sp, #112
2b24: aa0203e1 mov x1, x2
2b28: 94000000 bl 0x2b28 <_ff_seek_frame_binary+0x58>
2b2c: a90053f7 stp x23, x20, [sp]
2b30: 90000002 adrp x2, 0x2000 <_ff_seek_frame_binary+0x60>
2b34: 91000042 add x2, x2, #0
2b38: 94000000 bl 0x2b38 <_ff_seek_frame_binary+0x68>
; st = s->streams[stream_index];
2b3c: f9401a68 ldr x8, [x19, #48]
2b40: f8775914 ldr x20, [x8, w23, uxtw #3]
**; if (st->index_entries) {
2b44: f940e69a ldr x26, [x20, #456]
2b48: b400033a cbz x26, 0x2bac <_ff_seek_frame_binary+0xdc>**
; flags | AVSEEK_FLAG_BACKWARD);
2b4c: 320002c2 orr w2, w22, #0x1
2b50: 94000000 bl 0x2b50 <_ff_seek_frame_binary+0x80>
; index = FFMAX(index, 0);
2b54: 0aa07c08 bic w8, w0, w0, asr #31
; if (e->timestamp <= target_ts || e->pos == e->min_distance) {
### some one can help me found if my compile command somewhere error
[utils.zip](https://github.com/llvm/llvm-project/files/14383601/utils.zip)
</pre>
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