search for: vmov

...tcasts survive until instruction selection. In that case, they incur moves between integer unit and floating point unit that may result in inefficient code. Attached motivating_example.ll shows such a case: llc -O3 -mtriple thumbv7-apple-ios3 motivating_example.ll -o - ldr r0, [r1] ldr r1, [r2] vmov s1, r1 vmov s0, r0 Here each ldr, vmov sequences could have been replaced by a simple vld1.32. ** Proposed Solution ** Lower to more vector friendly code (using a sequence of insert_vector_elt), when bit casts will not be free. The attached patch demonstrates that, but is missing the proper check...

...pon closer examination I think it may actually be initialized from a program counter-relative 32-bit .long constant immediately following my method's code. .loc 1 388 3 ldr r0, [r5] ldr r1, [r4, r0] adds r1, #1 str r1, [r4, r0] .loc 1 390 64 mov r0, r4 ldr r1, [r6] blx _objc_msgSend vmov s0, r0 vmul.f32 d0, d0, d8 vcvt.u32.f32 d0, d0 vmov r0, s0 Ltmp272: .loc 1 392 9 cmp.w r0, #4000 Ltmp273: .loc 1 393 13 it hs blxhs _usleep cmp.w *looks* like a 16-bit comparison with an immediate constant, but in reality the constant is twelve bits. The ARM and Thumb instruction sets hav...

...; selection. In that case, they incur moves between integer unit and floating > point unit that may result in inefficient code. > > Attached motivating_example.ll shows such a case: > llc -O3 -mtriple thumbv7-apple-ios3 motivating_example.ll -o - > ldr r0, [r1] > ldr r1, [r2] > vmov s1, r1 > vmov s0, r0 > Here each ldr, vmov sequences could have been replaced by a simple vld1.32. > > ** Proposed Solution ** > Lower to more vector friendly code (using a sequence of > insert_vector_elt), when bit casts will not be free. > The attached patch demonstrates that...

...on selection. In that case, they incur moves between integer unit and floating point unit that may result in inefficient code. > > Attached motivating_example.ll shows such a case: > llc -O3 -mtriple thumbv7-apple-ios3 motivating_example.ll -o - > ldr r0, [r1] > ldr r1, [r2] > vmov s1, r1 > vmov s0, r0 > Here each ldr, vmov sequences could have been replaced by a simple vld1.32. > > ** Proposed Solution ** > Lower to more vector friendly code (using a sequence of insert_vector_elt), when bit casts will not be free. > The attached patch demonstrates that, b...

...hey incur moves between integer unit and floating >> point unit that may result in inefficient code. >> >> Attached motivating_example.ll shows such a case: >> llc -O3 -mtriple thumbv7-apple-ios3 motivating_example.ll -o - >> ldr r0, [r1] >> ldr r1, [r2] >> vmov s1, r1 >> vmov s0, r0 >> Here each ldr, vmov sequences could have been replaced by a simple >> vld1.32. >> >> ** Proposed Solution ** >> Lower to more vector friendly code (using a sequence of >> insert_vector_elt), when bit casts will not be free. >>...

...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 feature that is found in the ARM Compiler (http://infocenter.arm.com/help/topic/com.arm.doc.dui0471l/chr1368698593511. html). Would such a feature be accepted upstream? T...

...optimization in a NEON case I've seen these days, most as a matter of exercise, but it 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 imme...

..._to_16bit(int32_t a) { + int32_t ret; + asm ("ssat %[ret], #16, %[a]" + : [ret] "=&r" (ret) + : [a] "r" (a) + : ); + return ret; +} +#else +static inline int32_t saturate_32bit_to_16bit(int32_t a) { + int32_t ret; + asm ("vmov.s32 d0[0], %[a]\n" + "vqmovn.s32 d0, q0\n" + "vmov.s16 %[ret], d0[0]\n" + : [ret] "=&r" (ret) + : [a] "r" (a) + : "q0"); + return ret; +} +#endif +#undef WORD2INT +#define WORD2INT(x) (saturate_32b...

....1 generated code contains a misaligned load: bar: @ @bar @ BB#0: @ %L.entry push {r11, lr} add r0, r1, #2 vldr s0, [r1] vldr s2, [r0] # <= here load is misaligned vmovl.u8 q8, d0 vmovl.u8 q9, d1 vmovl.u16 q8, d16 vmovl.u16 q9, d18 vmov r0, r1, d16 vmov r2, r3, d18 bl zzz(PLT) pop {r11, pc} with LLVM trunk, assembly looks like: bar: @ @bar @ BB#0: @ %L...

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...t .align 2 _FloatingPointTest: @ @FloatingPointTest @ BB#0: @ %entry sub sp, sp, #8 str lr, [sp, #4] str r7, [sp] mov r7, sp sub sp, sp, #36 str r0, [r7, #-4] vmov s0, r0 str r1, [r7, #-8] vmov s1, r1 str r2, [r7, #-12] vmov s2, r2 vldr.32 s3, [r7, #-4] vldr.32 s4, [r7, #-8] vmul.f32 s3, s3, s4 vstr.32 s3, [r7, #-16] vldr.32 s4, [r7, #-12] vcmpe.f32 s...

...s, most as a matter of exercise, but it 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 inst...

...misaligned load: > > bar: @ @bar > @ BB#0: @ %L.entry > push {r11, lr} > add r0, r1, #2 > vldr s0, [r1] > vldr s2, [r0] # <= here load is misaligned > vmovl.u8 q8, d0 > vmovl.u8 q9, d1 > vmovl.u16 q8, d16 > vmovl.u16 q9, d18 > vmov r0, r1, d16 > vmov r2, r3, d18 > bl zzz(PLT) > pop {r11, pc} > > with LLVM trunk, assembly looks like: > > bar:...

...ot;fmov %w[ret], s0\n" > : [ret] "=&r" (ret) > : [a] "w" (a) > : "v0" ); > return ret; > } > #elif defined(__ARM_NEON__) > static inline int32_t saturate_32bit_to_16bit(int32_t a) { > int32_t ret; > asm volatile ("vmov.s32 d24[0], %[a]\n" > "vqmovn.s32 d24, q12\n" > "vmov.s16 %[ret], d24[0]\n" > : [ret] "=&r" (ret) > : [a] "r" (a) > : "q12", "d24", "d25" ); > return ret; > } > #else >...

...ovember 2010 17:52, Bob Wilson <bob.wilson at apple.com> wrote: > I recommend implementing this as a target-specific DAG combine optimization.  We already have target-specific DAG nodes for the relevant NEON comparison operations (ARMISD::VCEQ, etc. -- see ARMISelLowering.h) as well as the vmov (ARMISD::VMOVIMM).  You just need to teach the DAG combiner how to fold them together.  Here's what you need to do (all of this code is in ARMISelLowering.cpp): Hi Bob, I thought so... I'll get cracked and see if I can generate some simple tests. Thank you very much for the detailed expl...

Hi, Everyone: Can anyone let me know the default NEON registers llvm going to use with armv7 devices? For example, d10 and d11 are treated as default zero? I am using Xcode5 + llvm and I got a case that compiler will generate neon codes " vst.8 {d10, d11}, [r1] " from C codes: "int aMV[4]; ...... aMV[0] = aMV[1] = aMV[2] = aMV[3] = 0; " and I

.../A72), and I want to use NE 10 Project library , and llvm compiler 3.8.1.1 (https://projectne10.github.io/Ne10/) <https://projectne10.github.io/Ne10/> When compiling the project file I get the following errors : ./NE10_abs.asm.s:59:9: error: unrecognized instruction mnemonic vmov s2, r3 ^ ../NE10_abs.asm.s:62:9: error: unrecognized instruction mnemonic vldr s1, [r1] ^ ../NE10_abs.asm.s:63:13: error: invalid operand for instruction add r1, r1, #4 can you advice , how to handle it? Re, Yehuda Marko Yehuda.Marko at scaleil.com...

Hello, clang/llvm 4.0.0 generates invalid calls for builtin functions with -mfloat-abi=hard -ffast-math. Small example fail.c: // clang -O2 -target armv7a-none-none-eabi -mfloat-abi=hard -ffast-math -S fail.c -o - extern float sinf (float x); float sin1 (float x) {return (sinf (x));} generates code to pass the parameter in r0 and expect the result in r0. The same code without

From: Jyri Sarha <jsarha at ti.com> I optimized Speex resampler for NEON capable ARM CPUs. The first patch should speed up resampling on any platform that can spare the increased memory usage. It would be nice to have these merged to the master branch. Please let me know if there is anything I can do to help the the merge. The patches have been rebased on top of master branch in

Hi Sebastien, > Thanks for the quick answer, how do I know which type is legal/illegal with respect to calling convention ? the code generators are supposed to produce working code no matter what the parameter type is. The fact that the ARM ABI doesn't specify how <2 x i8> is passed just means that the code generators can pass it using whatever technique it feels like (since it