loop-opt-setup.c
1.21 KB
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// RUN: %clang -O1 -fexperimental-new-pass-manager -fno-unroll-loops -S -o - %s -emit-llvm | FileCheck %s -check-prefix=CHECK-NEWPM
// RUN: %clang -O1 -fno-experimental-new-pass-manager -fno-unroll-loops -S -o - %s -emit-llvm | FileCheck %s -check-prefix=CHECK-OLDPM
extern int a[16];
int b = 0;
int foo(void) {
#pragma unroll
for (int i = 0; i < 16; ++i)
a[i] = b += 2;
return b;
}
// Check br i1 to make sure that the loop is fully unrolled
// CHECK-LABEL-NEWPM: foo
// CHECK-NOT-NEWPM: br i1
// CHECK-LABEL-OLDPM: foo
// CHECK-NOT-OLDPM: br i1
void Helper() {
const int *nodes[5];
int num_active = 5;
while (num_active)
#pragma clang loop unroll(full)
for (int i = 0; i < 5; ++i)
if (nodes[i])
--num_active;
}
// Check br i1 to make sure the loop is gone, there will still be a label branch for the infinite loop.
// CHECK-LABEL-NEWPM: Helper
// CHECK-NEWPM: br label
// CHECK-NEWPM-NOT: br i1
// CHECK-NEWPM: br label
// The old pass manager doesn't remove the while loop so check for 5 load i32*.
// CHECK-LABEL-OLDPM: Helper
// CHECK-OLDPM: br label
// CHECK-OLDPM: load i32*
// CHECK-OLDPM: load i32*
// CHECK-OLDPM: load i32*
// CHECK-OLDPM: load i32*
// CHECK-OLDPM: load i32*
// CHECK-OLDPM: ret