https://bugs.llvm.org/show_bug.cgi?id=34530
Bug ID: 34530
Summary: Wrong results from floor() on arm
Product: clang
Version: 5.0
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P
Component: LLVM Codegen
Assignee: unassignedclangb...@nondot.org
Reporter: raj.k...@gmail.com
CC: llvm-bugs@lists.llvm.org
This testcase
#include <stdio.h>
#include <stdlib.h>
#include <math.h>
int main(void)
{
double test = 526457263.914274;
double test2 = 526457263.000000;
printf("orig=%f floor=%f\n", test, floor(test));
printf("orig=%f floor=%f\n", test2, floor(test2));
return 0;
}
runtime results on arm are wrong when -On option is not used.
root@raspberrypi3:~# ./a.out
orig=526457263.914274 floor=526457088.000052
orig=526457263.000000 floor=0.000000
if I compile it with -Os or -O2 then results are correct
root@raspberrypi3:~# ./a.out
orig=526457263.914274 floor=526457263.000000
orig=526457263.000000 floor=526457263.000000
This is a regression starting 4.0, it works fine with 3.7
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