diff options
| -rw-r--r-- | lib/Target/X86/README.txt | 29 |
1 files changed, 29 insertions, 0 deletions
diff --git a/lib/Target/X86/README.txt b/lib/Target/X86/README.txt index 46ef8b2225..2f8cb7e918 100644 --- a/lib/Target/X86/README.txt +++ b/lib/Target/X86/README.txt @@ -868,3 +868,32 @@ _f2: //===---------------------------------------------------------------------===// +This code: + +void test(int X) { + if (X) abort(); +} + +is currently compiled to (with -static): + +_test: + subl $12, %esp + cmpl $0, 16(%esp) + jne LBB1_1 #cond_true + addl $12, %esp + ret +LBB1_1: #cond_true + call L_abort$stub + +It would be better to produce: + +_test: + subl $12, %esp + cmpl $0, 16(%esp) + jne L_abort$stub + addl $12, %esp + ret + +This can be applied to any no-return function call that takes no arguments etc. + +//===---------------------------------------------------------------------===// |