mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2024-12-14 11:32:34 +00:00
53b4177df7
Carlo Alberto Ferraris. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@157736 91177308-0d34-0410-b5e6-96231b3b80d8
65 lines
1.2 KiB
LLVM
65 lines
1.2 KiB
LLVM
; RUN: opt < %s -basicaa -sink -S | FileCheck %s
|
|
|
|
@A = external global i32
|
|
@B = external global i32
|
|
|
|
; Sink should sink the load past the store (which doesn't overlap) into
|
|
; the block that uses it.
|
|
|
|
; CHECK: @foo
|
|
; CHECK: true:
|
|
; CHECK-NEXT: %l = load i32* @A
|
|
; CHECK-NEXT: ret i32 %l
|
|
|
|
define i32 @foo(i1 %z) {
|
|
%l = load i32* @A
|
|
store i32 0, i32* @B
|
|
br i1 %z, label %true, label %false
|
|
true:
|
|
ret i32 %l
|
|
false:
|
|
ret i32 0
|
|
}
|
|
|
|
; But don't sink load volatiles...
|
|
|
|
; CHECK: @foo2
|
|
; CHECK: load volatile
|
|
; CHECK-NEXT: store i32
|
|
|
|
define i32 @foo2(i1 %z) {
|
|
%l = load volatile i32* @A
|
|
store i32 0, i32* @B
|
|
br i1 %z, label %true, label %false
|
|
true:
|
|
ret i32 %l
|
|
false:
|
|
ret i32 0
|
|
}
|
|
|
|
; Sink to the nearest post-dominator
|
|
|
|
; CHECK: @diamond
|
|
; CHECK: X:
|
|
; CHECK-NEXT: phi
|
|
; CHECK-NEXT: mul nsw
|
|
; CHECK-NEXT: sub
|
|
|
|
define i32 @diamond(i32 %a, i32 %b, i32 %c) {
|
|
%1 = mul nsw i32 %c, %b
|
|
%2 = icmp sgt i32 %a, 0
|
|
br i1 %2, label %B0, label %B1
|
|
|
|
B0: ; preds = %0
|
|
br label %X
|
|
|
|
B1: ; preds = %0
|
|
br label %X
|
|
|
|
X: ; preds = %5, %3
|
|
%.01 = phi i32 [ %c, %B0 ], [ %a, %B1 ]
|
|
%R = sub i32 %1, %.01
|
|
ret i32 %R
|
|
}
|
|
|