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add another overflow idiom

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@121854 91177308-0d34-0410-b5e6-96231b3b80d8
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Chris Lattner 2010-12-15 07:28:58 +00:00
parent 08859ffa63
commit 9448184b99
1 changed files with 8 additions and 0 deletions
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8
lib/Target/README.txt
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@ -93,6 +93,14 @@ when it would be better to generate:
addq %rdi, %rbx
jno LBB0_2
Apparently some version of GCC knows this. Here is a multiply idiom:
unsigned int mul(unsigned int a,unsigned int b) {
if ((unsigned long long)a*b>0xffffffff)
exit(0);
return a*b;
}
//===---------------------------------------------------------------------===//
Get the C front-end to expand hypot(x,y) -> llvm.sqrt(x*x+y*y) when errno and