https://llvm.org/bugs/show_bug.cgi?id=26082
Bug ID: 26082
Summary: Invariant store should sink to loop exit
Product: tools
Version: 3.7
Hardware: PC
OS: All
Status: NEW
Severity: normal
Priority: P
Component: opt
Assignee: unassignedb...@nondot.org
Reporter: mar...@synopsys.com
CC: llvm-bugs@lists.llvm.org
Classification: Unclassified
The store in the inner loop should be moved to the loop exit block. The test
case is arbitrary. The idiom is common to many DSP kernels.
void test(const int * restrict p_a, const int * restrict p_b, int * restrict
p_z) {
#pragma clang loop unroll(disable)
for (int i = 0; i < 10; i++) {
*p_z = 0;
#pragma clang loop unroll(disable)
for (int f=0;f<10;f++)
*p_z += *p_a++ * *p_b++ ; //HERE
p_z++;
}
}
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