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POICC opt-report "subscript too complex"
 

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  1. POICC opt-report "subscript too complex"
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    <p>When I compile a given file with the -opt-report or -vec-report options in ICC I get, among others, this message:</p> <pre><code>foo.c(226:7-226:7):VEC:function_foo: loop was not vectorized: subscript too complex foo.c(226): (col. 7) warning #13379: loop was not vectorized with "simd" vectorization support: call to function absorbing_apply cannot be vectorized loop was not vectorized: not inner loop loop was not vectorized: unsupported loop structure loop was not vectorized: subscript too complex </code></pre> <p>I know the meaning of these messages. What concerns me is that in <code>foo.c:226</code> there isn't any loop at all. In fact, what is there is the invocation of another function. That function does contain some loops that operate through a volume and which indeed vectorizes properly as icc reports it. However, all the calls to that function give the same messages as the ones I pasted. </p> <p>Does icc get into a mess since it's showing vectorization messages in places with no loops at all? Or it's me that I misunderstood something?</p> <p>EDIT: I have semi-replicated the issue. This time, the compiler tells that it vectorized a line of a code where there is a call to another function (in the original case is just the other way, it says that it cannot). Here is the code:</p> <pre><code> 1 2 3 void foo(float *a, float *b, float *c, int n1, int n2, int n3, int ini3, int end3 ) { 4 int i, j, k; 5 6 for( i = ini3; i &lt; end3; i++ ) { 7 for( j = 0; j &lt; n2; j++ ) { 8 #pragma simd 9 #pragma ivdep 10 for( k = 0; k &lt; 4; k ++ ) { 11 int index = k + j*n1 + i*n1*n2; 12 a[index] = b[index] + 2* c[index]; 13 } 14 } 15 } 16 17 for( i = ini3; i &lt; end3; i++ ) { 18 for( j = 0; j &lt; n2; j++ ) { 19 #pragma simd 20 #pragma ivdep 21 for( k = n1-4; k &lt; n1; k ++ ) { 22 int index = k + j*n1 + i*n1*n2; 23 a[index] = b[index] + 2* c[index]; 24 } 25 } 26 } 27 28 return; 29 } 30 int main(void){ 31 int n1, n2, n3; 32 int ini3 = 20; 33 int end3 = 30; 34 n1 = n2 = n3 = 200; 35 36 float *a = malloc( n1 * n2 * n3 * sizeof(float )); 37 float *b = malloc( n1 * n2 * n3 * sizeof(float )); 38 float *c = malloc( n1 * n2 * n3 * sizeof(float )); 39 40 foo( a,b,c, n1, n2, n3, ini3, end3 ); 41 42 ini3 += 50; 43 end3 += 50; 44 45 foo( a,b,c, n1, n2, n3, ini3, end3 ); 46 47 free(a); free(b); free(c); 48 49 return 0; 50 } 51 </code></pre> <p>And the piece of the optimization report where ICC says it vectorized lines 40 and 45:</p> <pre><code>foo.c(40:4-40:4):VEC:main: LOOP WAS VECTORIZED loop was not vectorized: not inner loop loop was not vectorized: not inner loop LOOP WAS VECTORIZED loop was not vectorized: not inner loop loop was not vectorized: not inner loop foo.c(45:4-45:4):VEC:main: LOOP WAS VECTORIZED loop was not vectorized: not inner loop loop was not vectorized: not inner loop </code></pre> <p>Is this normal?</p>
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    1. COCan you show the code?
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    2. COI'm afraid I can't, excuse me. I'll see whether I can replicate the issue in a simple example.
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