https://bugs.llvm.org/show_bug.cgi?id=51642
Bug ID: 51642
Summary: clang-13 regression: -fsave-optimization-record is
generating empty files
Product: libraries
Version: trunk
Hardware: PC
OS: All
Status: NEW
Severity: release blocker
Priority: P
Component: Loop Optimizer
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
echo "
#define N 1536
float A[N][N];
float B[N][N];
float C[N][N];
void init_array()
{
int i, j;
for (i = 0; i < N; i++) {
for (j = 0; j < N; j++) {
A[i][j] = (1+(i*j)%1024)/2.0;
B[i][j] = (1+(i*j)%1024)/2.0;
}
}
}
int main()
{
int i, j, k;
double t_start, t_end;
init_array();
for (i = 0; i < N; i++) {
for (j = 0; j < N; j++) {
C[i][j] = 0;
for (k = 0; k < N; k++)
C[i][j] = C[i][j] + A[i][k] * B[k][j];
}
}
return 0;
}
" > foo.c
With clang-12:
$ clang-12 -S -fsave-optimization-record -emit-llvm foo.c -o matmul.s
$ ls -al matmul.opt.yaml
-rw-r--r-- 1 sylvestre sylvestre 535 27 août 09:53 matmul.opt.yaml
With clang-13:
$ clang-13 -S -fsave-optimization-record -emit-llvm foo.c -o matmul.s
$ ls -al matmul.opt.yaml
-rw-r--r-- 1 sylvestre sylvestre 0 27 août 09:54 matmul.opt.yaml
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