[Issue 10225] New: core.simd wrong codegen for XMM.STOUPS with __simd_sto

d-bugmail at puremagic.com d-bugmail at puremagic.com
Sat Jun 1 03:05:11 PDT 2013


http://d.puremagic.com/issues/show_bug.cgi?id=10225

           Summary: core.simd wrong codegen for XMM.STOUPS with __simd_sto
           Product: D
           Version: D2
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: P2
         Component: DMD
        AssignedTo: nobody at puremagic.com
        ReportedBy: code at benjamin-thaut.de


--- Comment #0 from Benjamin Thaut <code at benjamin-thaut.de> 2013-06-01 03:05:09 PDT ---
For the follwing small test program:

import core.simd;
import std.stdio;

void main(string[] args)
{
    float[] value1 = [1.0f, 2.0f, 3.0f, 4.0f];
    float4 result = __simd(XMM.LODUPS, *cast(float4*)value1.ptr);
    result = __simd(XMM.ADDPS, result, result);
    __simd_sto(XMM.STOUPS, *cast(float4*)value1.ptr, result);
    writefln("%s", value1);
}

Dmd will generate the follwing assembly:
mov         rax,qword ptr [rbp-68h]  
movups      xmm0,xmmword ptr [rax]  
movaps      xmmword ptr [rbp-60h],xmm0  
movdqa      xmm0,xmmword ptr [rbp-60h]  
addps       xmm0,xmmword ptr [rbp-60h]  
movaps      xmmword ptr [rbp-60h],xmm0  

As you can clearly see the last instruction is a movaps but it should be a
movups because XMM.STOUPS was given (unaligned store)

-- 
Configure issuemail: http://d.puremagic.com/issues/userprefs.cgi?tab=email
------- You are receiving this mail because: -------


More information about the Digitalmars-d-bugs mailing list