search for: nestlabs

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2013 Oct 15
1
[LLVMdev] Unwanted push/pop on Cortex-M.
Hi andrea, R11 treated as frame pointer at arm backend , which is fixed again . Thanks Umesh On Tuesday, October 15, 2013, Andrea Mucignat <andrea at nestlabs.com> wrote: > Umesh, > Makes some sort of sense to me, OTOH: > If instead of choosing r11 as a "dummy" to align the stack we had chosen some other register in the range r0-r7 then we could have emitted the PUSH encoding T1 (2 bytes opcode) as opposed to the encoding T2 (which...
2013 Oct 21
1
[LLVMdev] [PATCH] Unwanted r11 in push/pop on Cortex-M.
...b1 - if (!AFI->isThumb1OnlyFunction() || + if (!AFI->isThumbFunction() || isARMLowRegister(Reg) || Reg == ARM::LR) { MRI.setPhysRegUsed(Reg); if (!MRI.isReserved(Reg)) On Tue, Oct 15, 2013 at 10:15 AM, Andrea Mucignat <andrea at nestlabs.com>wrote: > Umesh, > > From Target/ARM/ARMRegisterInfo.td, it looks like FP for Thumb should be > r7 instead of r11. > > // Register classes. > // > // pc == Program Counter > // lr == Link Register > // sp == Stack Pointer > // r12 == ip (scratch) > // r...
2013 Oct 15
2
[LLVMdev] Unwanted push/pop on Cortex-M.
...restore the LR and the save and restore of register r11 is to align stack for 8 bytes as per ARM EABI. Thanks ~Umesh On Tuesday, October 15, 2013, Umesh Kalappa <umesh.kalappa0 at gmail.com> wrote: > ---------- Forwarded message ---------- > From: Andrea Mucignat <andrea at nestlabs.com> > Date: Tue, Oct 15, 2013 at 7:05 AM > Subject: [LLVMdev] Unwanted push/pop on Cortex-M. > To: llvmdev at cs.uiuc.edu > > > Hi, > > I have this code: > > void platform_putchar(int, char); > void out_char( char ch ); > > void out_char( char ch ) > {...
2013 Oct 15
0
[LLVMdev] Unwanted push/pop on Cortex-M.
...r r11 is to align stack for 8 bytes as per ARM EABI. > > > > Thanks > > ~Umesh > > > On Tuesday, October 15, 2013, Umesh Kalappa <umesh.kalappa0 at gmail.com> > wrote: > > ---------- Forwarded message ---------- > > From: Andrea Mucignat <andrea at nestlabs.com> > > Date: Tue, Oct 15, 2013 at 7:05 AM > > Subject: [LLVMdev] Unwanted push/pop on Cortex-M. > > To: llvmdev at cs.uiuc.edu > > > > > > Hi, > > > > I have this code: > > > > void platform_putchar(int, char); > > void out_char...
2013 Oct 15
0
[LLVMdev] Unwanted push/pop on Cortex-M.
...nans-fp-math"="false" "unsafe-fp-math"="false" "use-soft-float"="true" } attributes #2 = { nounwind readnone } attributes #3 = { nobuiltin nounwind optsize } !llvm.dbg.cu = !{!0} !0 = metadata !{i32 786449, metadata !1, i32 4, metadata !"nestlabs-clang version 3.3 (tags/RELEASE_33/final) (based on LLVM 3.3)", i1 true, metadata !"", i32 0, metadata !2, metadata !2, metadata !3, metadata !2, metadata !2, metadata !""} ; [ DW_TAG_compile_unit ] [/tmp/a.c] [DW_LANG_C_plus_plus] !1 = metadata !{metadata !"a.c",...