search for: define_compilerrt_function

...be I'm not reading the assembly right. This is lesf2vfp.S in compiler-rt, and it has this code: // extern int __lesf2vfp(float a, float b); // // Returns one iff a <= b and neither is NaN. // Uses Darwin calling convention where single precision arguments are passsed // like 32-bit ints // DEFINE_COMPILERRT_FUNCTION(__lesf2vfp) fmsr s14, r0 // move from GPR 0 to float register fmsr s15, r1 // move from GPR 1 to float register fcmps s14, s15 fmstat movls r0, #1 // set result register to 1 if equal movhi r0, #0 bx lr If I read this right, the high bits of r0 are always cleared (by the movhi)...

I figured it out. I was using this implementation of __chkstk from compiler-rt: DEFINE_COMPILERRT_FUNCTION(___chkstk) push %rcx cmp $0x1000,%rax lea 16(%rsp),%rcx // rsp before calling this routine -> rcx jb 1f 2: sub $0x1000,%rcx test %rcx,(%rcx) sub $0x1000,%rax cmp $0x1000,%rax ja 2b 1: s...

...this code: > > > > > > // extern int __lesf2vfp(float a, float b); > > // > > // Returns one iff a <= b and neither is NaN. > > // Uses Darwin calling convention where single precision arguments are passsed > > // like 32-bit ints > > // > > DEFINE_COMPILERRT_FUNCTION(__lesf2vfp) > > fmsr s14, r0 // move from GPR 0 to float register > > fmsr s15, r1 // move from GPR 1 to float register > > fcmps s14, s15 > > fmstat > > movls r0, #1 // set result register to 1 if equal > &g...

I suspect that there are 2 issues here: * I have incorrect alignment somewhere * MSVC / .pdb / CodeView debugging is not working correctly. I think the latter would help solve the former. I will send out a new email later talking about the issues I'm having debugging llvm-generated binaries with MSVC. On Sat, Sep 30, 2017 at 3:33 PM, Andrew Kelley <superjoe30 at gmail.com> wrote:

Hi List, I'm trying to build llvm-5.0.0 with clang-3.7.1 on ARM (native building). At some point I have the following issue : ---- [1588/5024] Building C object projects/compiler-rt/lib/builtins/CMakeFiles/clang_rt.builtins-arm.dir/cpu_model.c.o ../projects/compiler-rt/lib/builtins/cpu_model.c:596:7: warning: ISO C requires a translation unit to contain at least one declaration