http://llvm.org/bugs/show_bug.cgi?id=20088
Bug ID: 20088
Summary: llc handles comparissons incorrectly, 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 12684
--> http://llvm.org/bugs/attachment.cgi?id=12684&action=edit
Reproducer
In this test we assign a small values to an array and then compare them to
"100". All of them are less then 100, so we would like to have an array of "1"
as a result. But in trunk we have answer zeros.
To reproduce:
bin-3.4/bin/llc r1.ll -mattr=+avx
clang t.cpp r1.s
./a.out
1.000000
...
bin-trunk/bin/llc r1.ll -mattr=+avx
clang t.cpp r1.s
./a.out
0.000000
...
t.cpp:
#include <stdio.h>
extern "C" {
extern void f_f(float *result, float *a);
}
int main(int argc, char *argv[]) {
float returned_result[64];
float vfloat[64];
for (int i = 0; i < 64; ++i) {
vfloat[i] = i+1;
}
f_f(returned_result, vfloat);
for (int i = 0; i < 16; ++i) {
printf("%f\n", returned_result[i]);
}
return 0;
}
r1.ll is attached.
llc from trunk and 3.4 version generates very different asm files, trunk asm
file is very small and without mention of value "100".
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