digitalmars.D.bugs - [Issue 7953] New: DMD Error: variable r used before set when compiling with -O
- d-bugmail puremagic.com (87/87) Apr 20 2012 http://d.puremagic.com/issues/show_bug.cgi?id=7953
- d-bugmail puremagic.com (18/18) Apr 20 2012 http://d.puremagic.com/issues/show_bug.cgi?id=7953
- d-bugmail puremagic.com (10/10) Apr 21 2012 http://d.puremagic.com/issues/show_bug.cgi?id=7953
- d-bugmail puremagic.com (32/32) Apr 21 2012 http://d.puremagic.com/issues/show_bug.cgi?id=7953
- d-bugmail puremagic.com (7/19) Apr 21 2012 http://d.puremagic.com/issues/show_bug.cgi?id=7953
http://d.puremagic.com/issues/show_bug.cgi?id=7953
Summary: DMD Error: variable r used before set when compiling
with -O
Product: D
Version: D2
Platform: x86_64
OS/Version: Linux
Status: NEW
Severity: normal
Priority: P2
Component: DMD
AssignedTo: nobody puremagic.com
ReportedBy: suicidenet xited.de
--- Comment #0 from Zoadian <suicidenet xited.de> 2012-04-20 12:30:21 PDT ---
When compiling this code with dmd -O it says:
test.d(55) Error: variable r used before set
i might have overlooked something, but shouldn't that compile?
dmd 2.059 here.
import std.stdio;
import std.math;
import core.simd;
import std.datetime;
import std.conv;
/**
Benchmarks:
suicide zoaHTPC /media/code $ dmd test.d
_VEC: [TickDuration(2014413920)]
SIMD: [TickDuration(2057610817)]
suicide zoaHTPC /media/code $ dmd test.d -O
_VEC: [TickDuration(1589025986)]
SIMD: [TickDuration(2050198165)]
suicide zoaHTPC /media/code $ dmd test.d -O -release
_VEC: [TickDuration(1738538836)]
SIMD: [TickDuration(1172608340)]
suicide zoaHTPC /media/code $ dmd test.d -O -release -inline
_VEC: [TickDuration(1570424587)]
SIMD: [TickDuration(1184942170)]
suicide zoaHTPC /media/code $ dmd test.d -O -release -noboundscheck
_VEC: [TickDuration(752330929)]
SIMD: [TickDuration(1128528117)]
*/
string gen(int D) {
string s;
for(size_t i = 0; i < D-1; i+=4)
{
s ~= "v1.array = a1["~to!string(i)~".."~to!string(i+4)~"];";
s ~= "v2.array = a2["~to!string(i)~".."~to!string(i+4)~"];";
s ~= "r = __simd(XMM.ADDPS, v1,v2);";
//~ s ~= "res["~to!string(i)~".."~to!string(i+4)~"] = r.array;";
s ~= "res.ptr["~to!string(i)~"] = r.ptr["~to!string(i)~"];";
s ~= "res.ptr["~to!string(i+1)~"] = r.ptr["~to!string(i+1)~"];";
s ~= "res.ptr["~to!string(i+2)~"] = r.ptr["~to!string(i+2)~"];";
s ~= "res.ptr["~to!string(i+3)~"] = r.ptr["~to!string(i+3)~"];";
}
return s;
}
T[D] simdAdd(T, int D)(T[D] a1, T[D] a2) {
T[D] res;
float4 v1;
float4 v2;
float4 r;
//writeln(gen(D));
mixin(gen(D));
return res;
}
T[D] addV(T, int D)(T[D] a1, T[D] a2) {
T[D] r;
//foreach(x;0..10)
foreach(i;0..D)
r[i] = a1[i]+a2[i];
return r;
}
void main()
{
float[8] v1 = [1,2,3,4,1,2,3,4];
float[8] v2 = [1,2,3,4,1,2,3,4];
void test1(){addV(v1,v2);}
void test2(){simdAdd(v1,v2);}
// test2();
//~ writeln("STD: ",
benchmark!(addS!(int,4)([1,2,3,4],[1,2,3,4]))(10_000_000));
writeln("_VEC: ", benchmark!(test1)(10_000_000));
writeln("SIMD: ", benchmark!(test2)(10_000_000));
}
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Apr 20 2012
d-bugmail puremagic.com http://d.puremagic.com/issues/show_bug.cgi?id=7953 --- Comment #1 from Zoadian <suicidenet xited.de> 2012-04-20 12:32:53 PDT --- first one: suicide zoaHTPC /media/code $ dmd test.d -release -noboundscheck -O test.d(55): Error: variable r used before set another one: suicide zoaHTPC /media/code $ dmd test.d -release -noboundscheck -O -inline /usr/include/phobos2/std/datetime.d(29600): Error: variable std.path.sep is depr ecated /usr/include/phobos2/std/datetime.d(29601): Error: variable std.path.sep is depr ecated /usr/include/phobos2/std/path.d(2715): Error: alias std.path.onOutOfMemoryError is deprecated -- Configure issuemail: http://d.puremagic.com/issues/userprefs.cgi?tab=email ------- You are receiving this mail because: -------
Apr 20 2012
http://d.puremagic.com/issues/show_bug.cgi?id=7953
SomeDude <lovelydear mailmetrash.com> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |lovelydear mailmetrash.com
--- Comment #2 from SomeDude <lovelydear mailmetrash.com> 2012-04-21 13:56:42
PDT ---
Please reduce your code to the minimum that shows the behaviour.
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Apr 21 2012
http://d.puremagic.com/issues/show_bug.cgi?id=7953
--- Comment #3 from SomeDude <lovelydear mailmetrash.com> 2012-04-21 14:17:06
PDT ---
I've reduced the test case to this:
import core.simd;
import std.conv;
string gen(int D) {
string s;
s ~= "r = __simd(XMM.ADDPS, v1,v2);";
return "res.ptr["~to!string(0)~"] = r.ptr["~to!string(0)~"];";
}
T[D] simdAdd(T, int D)(T[D] a1, T[D] a2) {
T[D] res;
float4 r;
mixin(gen(D));
return res;
}
void main()
{
float[8] v1 = [1,2,3,4,1,2,3,4];
float[8] v2 = [1,2,3,4,1,2,3,4];
simdAdd(v1,v2);
}
but I can't reproduce the error message, so maybe I've overlooked something.
However, interestingly, this compiles with -O flag and crashes the compiler
without.
PS E:\DigitalMars\dmd2\samples> rdmd bug.d
Internal error: ..\ztc\cg87.c 1699
PS E:\DigitalMars\dmd2\samples> rdmd -O bug.d
PS E:\DigitalMars\dmd2\samples>
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Apr 21 2012
http://d.puremagic.com/issues/show_bug.cgi?id=7953 --- Comment #4 from SomeDude <lovelydear mailmetrash.com> 2012-04-21 14:19:31 PDT --- (In reply to comment #3)I've reduced the test case to this: ... but I can't reproduce the error message, so maybe I've overlooked something. However, interestingly, this compiles with -O flag and crashes the compiler without. PS E:\DigitalMars\dmd2\samples> rdmd bug.d Internal error: ..\ztc\cg87.c 1699 PS E:\DigitalMars\dmd2\samples> rdmd -O bug.d PS E:\DigitalMars\dmd2\samples>The ICE may be related to issue 7951. -- Configure issuemail: http://d.puremagic.com/issues/userprefs.cgi?tab=email ------- You are receiving this mail because: -------
Apr 21 2012