diff options
| -rw-r--r-- | lib/Target/X86/README.txt | 28 |
1 files changed, 28 insertions, 0 deletions
diff --git a/lib/Target/X86/README.txt b/lib/Target/X86/README.txt index f479712d7c..941d52294b 100644 --- a/lib/Target/X86/README.txt +++ b/lib/Target/X86/README.txt @@ -506,3 +506,31 @@ and ISD::FMAX node types? //===---------------------------------------------------------------------===// Select (add, x, GlobalAddress) to ADD32ri, etc. when it's appropriate. + +//===---------------------------------------------------------------------===// + +The first BB of this code: + +declare bool %foo() +int %bar() { + %V = call bool %foo() + br bool %V, label %T, label %F +T: + ret int 1 +F: + call bool %foo() + ret int 12 +} + +compiles to: + +_bar: + subl $12, %esp + call L_foo$stub + xorb $1, %al + testb %al, %al + jne LBB_bar_2 # F + +It would be better to emit "cmp %al, 1" than a xor and test. + + |