search for: movt

...r instruction operands for any special encoding needs, including registering fixups, using the EncoderMethod string. For an example, have a look at the LDRi12 instruction and how it registers a fixup for the addrmode_imm12 operand when it needs one. Hi Jim,. follow up question for ya: The current movt/movw pair (as defined in ARMInstrInfo.td) does not use EncoderMethod string to declare a special case handler. At the current time, for the assembly printing, MCAsmStreamer::EmitInstruction(const MCInst &Inst) calls out to MCExpr::print(raw_ostream &OS) which then calls out to MCSym...

Hi everyone, happy new year. This note is to announce that support for PC relative reloc tags for movw/movt is nearing completion (hopefully <48hrs!). This work is is from Jan Voung, David Meyer and myself. Unfortunately, to test this change, we need to patch ARM/AsmParser to address http://llvm.org/bugs/show_bug.cgi?id=8721 Locally, we have hacked up a solution to 8721, but its not ideal since VK_AR...

...Add the subtarget feature/attribute "execute-only" to the ARM code generator to enable the feature. - Add a clang option "-mexecute-only" that passes said attribute to LLVM. If execute only is enabled: - Instead of using integer literal pools, use movw/movt to construct the literals. This means this feature is only available for sub-targets that support these instructions. - For floating point literals, use movw/movt/vmov instead of a literal pool. - Move jump tables to data sections. This is basically a re-implementation of a...

On 10 January 2011 22:59, Jason Kim <jasonwkim at google.com> wrote: > Hi everyone, happy new year. > > This note is to announce that support for PC relative reloc tags for > movw/movt is nearing completion (hopefully <48hrs!). This work is is > from Jan Voung, David Meyer and myself. Hi Jason, Happy new year! That seems a long patch... with many changes... can't wait for it. ;) Btw, I know this is for ELF printing, but can the same infrastructure you're using t...

...ely separate subject? Hi Renato, If I am understanding you correctly, then the answer is no, because .s output doesn't care about relocations per se... BUT.. its also yes because sometimes, the asmwriter will sometimes need to generate sequences like below foo: movw r0, :lower16:bar-foo movt r0, :upper16:bar-foo The subtraction implies that the value bar-foo is implicitly pc-relative (at least according to GNU as). Thanks! -jason

Hi I'm working on a POC adding Windows Phone (ARM) support to the ARM backend. I've encountered the following problem. Microsoft's COFF linker/loader supports a single relocation type ( IMAGE_REL_ARM_MOV32T) on continuous movw/movt Thumb2 instructions opposed to ELF and Mach-O which support relocation per instruction (one for movw and movt). I need to make sure that in case of immediate operands which needs fix-up for these instructions they will grouped together with no other instruction inserted between them. Also they nee...

...d cycleContinuously]": Ltmp265: Lfunc_begin24: .loc 1 380 0 .loc 1 380 1 prologue_end push {r4, r5, r6, r7, lr} add r7, sp, #12 push.w {r8, r10, r11} vpush {d8} sub sp, #4 .loc 1 382 2 Ltmp266: movw r1, :lower16:(L_OBJC_SELECTOR_REFERENCES_7-(LPC24_0+4)) Ltmp267: mov r4, r0 Ltmp268: movt r1, :upper16:(L_OBJC_SELECTOR_REFERENCES_7-(LPC24_0+4)) movw r0, :lower16:(L_OBJC_CLASSLIST_REFERENCES_$_62-(LPC24_1+4)) movt r0, :upper16:(L_OBJC_CLASSLIST_REFERENCES_$_62-(LPC24_1+4)) LPC24_0: add r1, pc LPC24_1: add r0, pc ldr r1, [r1] ldr r0, [r0] blx _objc_msgSend movw r1, :lower16:(L_...

...ocation (target1) and exception handling table symbols (prel31) are clearly disregarded by gas and subsequently discarded by armlink. > its also yes because sometimes, the asmwriter will sometimes need to > generate sequences like below > > foo: >   movw r0, :lower16:bar-foo >   movt r0, :upper16:bar-foo > > The subtraction implies that the value bar-foo is implicitly > pc-relative (at least according to GNU as). That was the other part of my question: will your new MC-relocationator also print the current ASM relocations? ;) cheers, --renato

...ract with ARM codegen? The constant island pass in particular. > Hi Jim, This is a great question. >From the compiler's point of view, these bundles indeed pose a problem for the constant island pass. At this point for the NaCl platform we disable this pass, generating instructions like movt instead (NaCl requires at least v7 for ARM). However, as a future enhancement we'd like to follow gcc's path and adjust the pass to coexist with potential bundling by computing worst-case estimates for the sizes of bundle-locked instruction sequences. >From the assembler's point of...

...an into an issue related to llvm in Swiftshader. Currently fixup_aarch64_movw relocation type is not supported for COFF ARM64 (AArch64WinCOFFObjectWriter). As far as I see, Microsoft hasn't defined indicator for this relocation type. I haven't seen documented anywhere. For AArch32 mova/movt indicators were implemented, I'm not sure but maybe we need to have something similar for AArch64? Could someone give me some pointers how I could handle/fix this? Many thanks, Regards, Adam

...island pass in particular. >> > > Hi Jim, > > This is a great question. > From the compiler's point of view, these bundles indeed pose a problem > for the constant island pass. At this point for the NaCl platform we > disable this pass, generating instructions like movt instead (NaCl > requires at least v7 for ARM). However, as a future enhancement we'd > like to follow gcc's path and adjust the pass to coexist with > potential bundling by computing worst-case estimates for the sizes of > bundle-locked instruction sequences. That's going t...

>> Do the ARM usages include allowing a single pseudo-instruction to expand >> to multiple real instructions? For example, a movw/movt pair? If so, I’m >> *very* opposed to that part. > > > Why? For people writing assembly manually, having pseudo instructions to > encapsulate common patterns is very useful. Would it be acceptable for this pseudo-instruction to expand to movw/movt for some targets, and ldr for o...

On Feb 17, 2011, at 10:35 PM, Вадим Марковцев wrote: > Hello everyone, > > I've added the "S" suffixed versions of ARM and Thumb2 instructions to tablegen. Those are, for example, "movs" or "muls". > Of course, some instructions have already had their twins, such as add/adds, and I leaved them untouched. Adding separate "s" instructions is

...t, or any ARM target for that matter (as opposed to other important work on compiler correctness or architectural elegance or formatting comment white-space, I mean). Is he alone or are there others working toward such improvements? The subject of two of his commits dealt with substituting MOVW/MOVT pairs for an LDR and a lit-pool. Isn't this what MachineConstantPool and ARMConstantIslandPass was all about? I vaguely recall a while back that it was disabled by some Darwin snob who thought no useful target benefited from it. What about enabling it again? Perhaps you've noticed in t...

Hi Gary, On 3 December 2013 22:01, Gary Fuehrer <gfuehrer at defiant-tech.com> wrote: > The subject of two of his commits dealt with substituting MOVW/MOVT pairs > for an LDR and a lit-pool. Isn't this what MachineConstantPool and > ARMConstantIslandPass was all about? Both are essential components to using lit-pools: the MachineConstantPool is just LLVM's underlying machinery and ARMConstantIslands is for fixing up out of range loads a...

On Oct 14, 2013, at 3:27 AM, Zakk <zakk0610 at gmail.com> wrote: > Hi all, > I meet this problem when compiling the TREAM benchmark (http://www.cs.virginia.edu/stream/FTP/Code/) with enable-misched > > The small function will be scheduled as good code, but if opt inline this function, the inline part will be scheduled as bad code. A bug for this is welcome. Pretty soon, I’ll

Hello everyone, I've added the "S" suffixed versions of ARM and Thumb2 instructions to tablegen. Those are, for example, "movs" or "muls". Of course, some instructions have already had their twins, such as add/adds, and I leaved them untouched. Besides, I propose the codegen optimization based on them, which removes the redundant comparison in patterns like orr

...also simplifies (just a bit) the code generated. The case is simple: uint32x2_t x, res; res = vceq_u32(x, vcreate_u32(0)); This will generate the following code: ; zero d16 vmov.i32 d16, #0x0 ; load a into d17 movw r0, :lower16:a movt r0, :upper16:a vld1.32 {d17}, [r0] ; compare two registers vceq.i32 d17, d17, d16 But, because the vector is zero, and there is a NEON instruction to compare against an immediate zero (VCEQZ), we could combine the two instructions: ; load a into d17...

...;> Currently fixup_aarch64_movw relocation type is not supported for >> COFF ARM64 (AArch64WinCOFFObjectWriter). As far as I see, Microsoft >> hasn't defined indicator for this relocation type. I haven't seen >> documented anywhere. >> >> For AArch32 mova/movt indicators were implemented, I'm not sure but >> maybe we need to have something similar for AArch64? > > The AArch32 movw/movt relocation was for a true relocation, where the > target of the relocation is a symbol that is unknown at the assembly > stage. But for AArch64 th...

Hi all, I meet this problem when compiling the TREAM benchmark ( http://www.cs.virginia.edu/stream/FTP/Code/) with enable-misched The small function will be scheduled as good code, but if opt inline this function, the inline part will be scheduled as bad code. so I rewrite a simple code as attached link (foo.c), and compiled with two different methods: *method A:* *$clang -O3 foo.c -static -S