Source: llvm-toolchain-19 Version: 1:19.1.1-1 Severity: important Control: clone -1 -2 Control: reassign -2 src:llvm-toolchain-18
Hi,I happened to look at the llvm-toolchain-18/19 reproducibility results because they seem to be flaky. I noticed that the diffoscope output [1] showed differences in assembly code that to my untrained eyes suggest that the binaries of llvm-toolchain-18/19 might depend on the CPU capabilities of the build cpu, which might be a baseline violation. Can you please check?
It shows calls like pand vs vpand and movd vs vmovd. A quick query on the internets seems to indicate that compiling with -mno-avx could prevent this delta.
Paul https://tests.reproducible-builds.org/debian/rb-pkg/unstable/amd64/diffoscope-results/llvm-toolchain-19.htmlobjdump --line-numbers --disassemble --demangle --reloc --no-show-raw-insn --section=.text.acosf {}
Offset 7, 200 lines modified Offset 7, 225 lines modified
7 acosf(): 7 acosf():
8 » endbr64 8 » endbr64
9 » push···%rbp 9 » push···%rbp
10 » mov····%rsp,%rbp 10 » mov····%rsp,%rbp
11 » sub····$0x30,%rsp 11 » sub····$0x30,%rsp
12 » mov····%fs:0x28,%rax 12 » mov····%fs:0x28,%rax
13 » mov····%rax,-0x8(%rbp) 13 » mov····%rax,-0x8(%rbp)
14 » movd···%xmm0,%eax
14 » vpbroadcastd·0x0(%rip),%xmm1········ 15 »
movdqa·0x0(%rip),%xmm1········
15 ·R_X86_64_PC32» .LCPI0_0-0x4 16 ·R_X86_64_PC32» .LCPI0_0-0x4 16 » vmovd··%xmm0,%eax 17 » vpand··%xmm1,%xmm0,%xmm1 17 » pand···%xmm0,%xmm1 18 » vmovd··%xmm1,%ecx 18 » movd···%xmm1,%ecx 19 » cmp····$0x3f000000,%ecx 19 » cmp····$0x3f000000,%ecx20 » ja·····6f·<__llvm_libc_19_1_1_::acosf(float)+0x6f> 20 » ja·····6a·<__llvm_libc_19_1_1_::acosf(float)+0x6a>
21 » cmp····$0x3a7fffff,%ecx 21 » cmp····$0x3a7fffff,%ecx22 » ja·····c3·<__llvm_libc_19_1_1_::acosf(float)+0xc3> 22 » ja·····ab·<__llvm_libc_19_1_1_::acosf(float)+0xab>
23 » cmp····$0x328885a2,%eax 23 » cmp····$0x328885a2,%eax24 » jg·····1e6·<__llvm_libc_19_1_1_::acosf(float)+0x1e6> 24 » jg·····225·<__llvm_libc_19_1_1_::acosf(float)+0x225>
25 » cmp····$0xb28885a3,%eax 25 » cmp····$0xb28885a3,%eax26 » je·····2c9·<__llvm_libc_19_1_1_::acosf(float)+0x2c9> 26 » je·····2ed·<__llvm_libc_19_1_1_::acosf(float)+0x2ed>
27 » cmp····$0xb9826222,%eax 27 » cmp····$0xb9826222,%eax28 » jne····28f·<__llvm_libc_19_1_1_::acosf(float)+0x28f> 28 » jne····2bc·<__llvm_libc_19_1_1_::acosf(float)+0x2bc> 29 » lea····0x0(%rip),%rax········ 29 » lea····0x0(%rip),%rax········ 30 ·R_X86_64_PC32» .rodata._ZN19__llvm_libc_19_1_1_L13ACOSF_EXCEPTSE+0x38 30 ·R_X86_64_PC32» .rodata._ZN19__llvm_libc_19_1_1_L13ACOSF_EXCEPTSE+0x38 31 » jmp····2d9·<__llvm_libc_19_1_1_::acosf(float)+0x2d9> 31 » jmp····2fd·<__llvm_libc_19_1_1_::acosf(float)+0x2fd>
32 » cmp····$0x3f800000,%ecx 32 » cmp····$0x3f800000,%ecx33 » jb·····146·<__llvm_libc_19_1_1_::acosf(float)+0x146> 33 » jb·····15d·<__llvm_libc_19_1_1_::acosf(float)+0x15d> 34 » jne····208·<__llvm_libc_19_1_1_::acosf(float)+0x208> 34 » jne····247·<__llvm_libc_19_1_1_::acosf(float)+0x247>
35 » vxorps·%xmm0,%xmm0,%xmm0 35 » pxor···%xmm0,%xmm0 36 » test···%eax,%eax 36 » test···%eax,%eax37 » jns····2b4·<__llvm_libc_19_1_1_::acosf(float)+0x2b4> 37 » jns····347·<__llvm_libc_19_1_1_::acosf(float)+0x347> 38 » movl···$0x40490fdb,-0x28(%rbp) 38 » movl···$0x40490fdb,-0x28(%rbp)
39 » vmovss·-0x28(%rbp),%xmm0 39 » movss··-0x28(%rbp),%xmm040 » vaddss·0x0(%rip),%xmm0,%xmm0········ 40 » addss··0x0(%rip),%xmm0········
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