RPCS3/llvm-mirror
1
0
Fork 0
mirror of https://github.com/RPCS3/llvm-mirror.git synced 2024-11-24 11:42:57 +01:00
Code Issues Projects Releases Wiki Activity

Eliminate an assortment of undefined behavior.

Browse Source 
Hopefully, this fixes the PPC64 buildbots.

llvm-svn: 185218
This commit is contained in:
Jakob Stoklund Olesen 2013-06-28 21:10:25 +00:00
parent 803f7c3932
commit 0057eee43d
1 changed files with 5 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
lib/Support/BlockFrequency.cpp
View File

@ -47,9 +47,13 @@ static uint64_t div96bit(uint64_t W[2], uint32_t D) {
uint64_t x = W[1];
unsigned i;
// This is really a 64-bit division.
if (!x)
return y / D;
// This long division algorithm automatically saturates on overflow.
for (i = 0; i < 64 && x; ++i) {
uint32_t t = (int)x >> 31;
uint32_t t = -((x >> 31) & 1); // Splat bit 31 to bits 0-31.
x = (x << 1) | (y >> 63);
y = y << 1;
if ((x | t) >= D) {