search for: imm8

Which BTQ? There are three flavors. BTQ reg/reg BTQ reg/mem BTQ reg/imm I can imagine that the reg/reg and especially the reg/mem versions would be slow. However the shrq/and versions *with the same operands* would be slow as well. There's even a compiler comment about the reg/mem version saying "this is for disassembly only". But I doubt BTQ reg/imm would be microcoded. -- Ite

Hi all, I have problem with specifying complex patterns in PPC Isel backend. I would like to fetch few instructions into one like that: def MatchPAT1 : Pat<(or (or (shl GPRC:$rA, (i32 imm:$imm24)), (and (shl GPRC:$rA, (i32 imm:$imm8)), 0xFF0000) ), (or (srl GPRC:$rA, (i32 imm:$imm24)), (and (shl GPRC:$rA, (i32 imm:$imm8)),0xFF00) )), (myinstr GPRC:$rA)>; That pattern corresponds to i32 bswap intrinsic. The thing is that such complex pattern matching does not work. I can specify really simple patterns like: shl...

...generates better code for them ? I'm a bit disappointed about the llvm-gcc 2.0 I tried for my iPod Touch as I saw it generated ARM code not very optimically : r7(apparently used like a frame pointer even when -fomit-frame-pointer is given) largely overused, generated code like "mov rx, imm8;orr rx, rx, imm8';add rx, rx, ry" instead of "add rx, ry, imm8;add rx, rx, imm8'", etc. I'm also wondering if the official SDK expected for February offers a llvm-gcc as a c/c++ compiler. Which version ? Regards. On 21/01/2008 22:55:30, Chris Lattner (sabre at nondo...

Dear all, I have written an assembler which reads assembly instructions and produces the equivalent binary. I have a problem. Although I set the bit range and immediate type for an instruction like add which accepts a register and an immediate value, I can simply overflow that value and llvm/tablegen doesn't care! for example for a i8imm imm value (bits<8> val) these two produce the

...tion in LLVM for thumb2 add. Probably starting with t2 instead of t. The definition of tADDi8 looks like this. Where tGPR specifically means R0-R7. def tADDi8 : // A8.6.4 T2 T1sItGenEncodeImm<{1,1,0,?,?}, (outs tGPR:$Rdn), (ins tGPR:$Rn, imm0_255:$imm8), IIC_iALUi, "add", "\t$Rdn, $imm8", [(set tGPR:$Rdn, (add tGPR:$Rn, imm8_255:$imm8))]>, Sched<[WriteALU]>; ~Craig On Sun, Apr 14, 2019 at 12:21 PM Jie Zhou <jzhou41 at cs.rochester.edu<mailto:jz...

...0 > 2: c3 ret > > Is this intended behavior? > I haven't looked at the source code but I'm guessing that llvm-objdump is just being "dumb" in the sense that the disassembly API's probably just return the imm8 as the raw field value and llvm-objdump is just printing that, rather than actually interpreting it as an address (relative to the instruction). In other words, binutils objdump is printing the operand of the JMP as the address it jumps to, while llvm-objdump is printing the raw imm8 field value. T...

In creating a test case for a bug fix in llvm-objdump, I noticed that it differs in its output of pc-relative immediates from objdump: [secdev:/tmp] s$ cat a.s main: jmp .LBL0 .LBL0: ret [secdev:/tmp] s$ llvm-mc -filetype=obj a.s > a.o [secdev:/tmp] s$ objdump -d a.o |tail -n 2 0: eb 00 jmp 2 <main+0x2> 2: c3 retq

...; <MCOperand Imm:0> ; <MCOperand Imm:1000>> I still get the 8-bit variant instead of LDAi16oPC, and the operand is truncated. The TableGen-generated .inc file has { 444 /* lda */, MC6809::LDAi8oPC, Convert__imm_95_0__Imm81_0, AMFBS_None, { MCK_Imm8, MCK_PC }, }, { 444 /* lda */, MC6809::LDAi16oPC, Convert__imm_95_0__Imm161_0, AMFBS_None, { MCK_Imm16, MCK_PC }, }, ... so how do I get the 16-bit variant with MCK_Imm16 selected instead? The instructions are defined as def LDAi8oPC : MC6809LoadIndexed_i8oPC_P1<...

Sorry for not being specific enough. ARMv7-M includes Thumb and Thumb2. It has 12 regular registers (R0 - R12), and R8 - R12 are used. I can generate mov instruction that from/ R8-R12 to/from R0-R6. From this ARM page http://infocenter.arm.com/help/index.jsp?topic=/com.arm.doc.dui0068b/ch03s03s01.html R9 - R12 have their conventional usage, but I don’t if this is the reason we cannot use them

...+ break; + + case TRAP_overflow: + type = X86_EVENTTYPE_SW_EXCEPTION; /* into; CE */ + break; + default: - if ( trap > TRAP_last_reserved ) - { - type = X86_EVENTTYPE_SW_EXCEPTION; - __vmwrite(VM_ENTRY_INSTRUCTION_LEN, 2); /* int imm8 */ - } break; } @@ -2447,6 +2457,11 @@ void vmx_vmexit_handler(struct cpu_user_ if ( handled < 0 ) { vmx_inject_exception(TRAP_int3, HVM_DELIVER_NO_ERROR_CODE, 0); + /* + * Accor...

On Wed, Jul 10, 2013 at 7:15 PM, Jim Grosbach <grosbach at apple.com> wrote: > > On Jul 10, 2013, at 6:54 PM, Stephen Checkoway <s at pahtak.org> wrote: > > On Jul 10, 2013, at 17:44, Jim Grosbach <grosbach at apple.com> wrote: > > The length specifier is, as I understand it, required when the instruction > references memory but is optional (and inferred from

On Jul 10, 2013, at 6:54 PM, Stephen Checkoway <s at pahtak.org> wrote: > On Jul 10, 2013, at 17:44, Jim Grosbach <grosbach at apple.com> wrote: >> The length specifier is, as I understand it, required when the instruction references memory but is optional (and inferred from the registers) for the register variants. >> >> The best reference I know of for the

...ee Figure 3-2). The offset operand then selects a bit position within the range −231 to 231 − 1 for a register offset and 0 to 31 for an immediate offset. However, this doesn't seem to be true if the immediate value is greater than 15. See the attached imm.c which prints the results of bts m16,imm8 (btsw) and bts m32,imm8 (btsl) with the immediate in [0,63]. For btsw, only the least significant 4 bits of the immediate seem to be used whereas for btsl, only the least significant 5 bits seem to be used. In contrast, bts m16,r16 (btsw) and bts m32,r32 (btsl) are identical for bit offset operand...

...ine void @foo(i32 *%a) { entry: %0 = load i32, i32* %a, align 4 %add = add i32 %0, 3 store i32 %add, i32* %a, align 4 ret void } On x86, this gets turned into: addl $3, (%rdi) retq From X86InstrArithmetic.td: // BinOpMI8_RMW - Instructions like "add [mem], imm8". class BinOpMI8_RMW<string mnemonic, X86TypeInfo typeinfo, SDPatternOperator opnode, Format f> : BinOpMI8<mnemonic, typeinfo, f, [(store (opnode (load addr:$dst), typeinfo.Imm8Operator:$src), addr:$dst),...

...ed an example (not the original). Note that i added %prefix_ before $sp register. Tablegen seems to interpret % as placeholder for inserting register. Is there any way to make tablgen ignore the %? I have tried '\' character, and two "%%". None worked. // ADD <Rd>, sp, #<imm8> // This is rematerializable, which is particularly useful for taking the // address of locals. let isReMaterializable = 1 in def tADDrSPi : T1I<(outs tGPR:$dst), (ins GPR:$sp, t_imm_s4:$rhs), IIC_iALUi, "add\t$dst, %prefix_$sp, $rhs", []>, T1Enc...

Some instructions, like "add $imm8, r/m16"/"MOV $imm32, r/m64" require the src immediate operand be sign-extented befere the op is executed, but this is omitted in the current Xcode. The patch fixes this. The patch also fixes an issue in handling address-size override prefix, and fixes an issue in get_immediate(). Si...

...-63 return TCC_Free; This works. Its only downside is when these values are being used twice AND then not being combined into another instruction. I'd also recommend looking at not hoisting other values. However I haven't really looked this over very thoroughly. // Don't hoist imm8 if (Imm.isSignedIntN(8)) return TCC_Free; -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.llvm.org/pipermail/llvm-dev/attachments/20150202/56d432d0/attachment.html> -------------- next part -------------- A non-text attachment was scrubbed.....

what do you mean by "more optimal instructions" ? -omer On Wed, Nov 16, 2011 at 1:28 AM, Joe Abbey <jabbey at arxan.com> wrote: > I've done a first pass over the past 6 months of changes and some notable > things stood out: > > * The ARM backend has reworked Set Jump Long Jump EH Lowering. > * The ARM backend includes improved support for Cortex-M > *

On Tue, Mar 17, 2015 at 6:14 PM, Tim Northover <t.p.northover at gmail.com> wrote: >> As a simplification, the compiler deals almost exclusively in pseudo >> instructions. By x86 analogy, using pseudos to unfold a TEST32rm into >> MOV32rm + TEST32rr means I can skip the complex operand fitting effort >> needed to pick specific machine instructions. There are many

...IA r0, {d0} when it should decode to FSTMIAX r0, {d0} These instructions are a bit of a curiosity in that they are pre-ARMv6 (VFPv1) instruction mnemonics which were not superseded by UAL-style V* mnemonics. They still exist in VFPv4 but their use is deprecated. Any VSTM's with odd numbered imm8 fields (bottom 8 bits) are the old-style F* encodings, and the encoding i for the immediate is different. -------------- next part -------------- A non-text attachment was scrubbed... Name: ca8_ARM_enc_dec_alcond_diffsonly_raw.rpt.bz2 Type: application/octet-stream Size: 1272798 bytes Desc: not av...