diff options
| -rw-r--r-- | lib/Target/README.txt | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/lib/Target/README.txt b/lib/Target/README.txt index e59c28697a..5c97b8984c 100644 --- a/lib/Target/README.txt +++ b/lib/Target/README.txt @@ -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 |