diff options
| -rw-r--r-- | lib/Target/X86/README.txt | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/lib/Target/X86/README.txt b/lib/Target/X86/README.txt index fcbae96bee..6f6abd478d 100644 --- a/lib/Target/X86/README.txt +++ b/lib/Target/X86/README.txt @@ -1691,3 +1691,21 @@ LBB1_1: ## bb.i ... //===---------------------------------------------------------------------===// + +We compile: + +int test(int x, int y) { + return x-y-1; +} + +into (-m64): + +_test: + decl %edi + movl %edi, %eax + subl %esi, %eax + ret + +it would be better to codegen as: x+~y (notl+addl) + +//===---------------------------------------------------------------------===// |