http://llvm.org/bugs/show_bug.cgi?id=20118
Bug ID: 20118
Summary: llc handles pointer arithmetic in a strange way,
Linux, trunk, regression from version 3.4
Product: tools
Version: trunk
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P
Component: llc
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
Classification: Unclassified
Created attachment 12700
--> http://llvm.org/bugs/attachment.cgi?id=12700&action=edit
Reproducer
To reproduce:
llc reproducer.ll -mattr=+avx2 -o c.s (llc from trunk)
clang c.s test.cpp -O0 (any clang)
test.cpp:
#include <stdio.h>
extern "C" {
extern void f_fu(float *result);
}
int main(int argc, char *argv[]) {
float returned_result[64] __attribute__((aligned(64)));
f_fu(returned_result);
for (int i = 0; i < 8; ++i) {
printf("%f, ", returned_result[i]);
}
printf("\n");
return 0;
}
reproducer.ll is attached.
The right answer is
"6.000000, 7.000000, 8.000000, 9.000000, 10.000000, 11.000000, 12.000000,
13.000000,"
and if we take llc from 3.4 version we will have this answer. However llc from
trunk results in:
"6.000000, 15.000000, 8.000000, 9.000000, 2.000000, 11.000000, 12.000000,
13.000000,", which is wrong.
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