mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2025-10-30 16:17:05 +00:00
7f2076023a
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@84671 91177308-0d34-0410-b5e6-96231b3b80d8
59 lines
1.3 KiB
LLVM
59 lines
1.3 KiB
LLVM
; RUN: opt < %s -sccp -S | FileCheck %s
|
|
|
|
; This is a basic sanity check for constant propagation. The add instruction
|
|
; should be eliminated.
|
|
|
|
define i32 @test1(i1 %B) {
|
|
br i1 %B, label %BB1, label %BB2
|
|
BB1: ; preds = %0
|
|
%Val = add i32 0, 0 ; <i32> [#uses=1]
|
|
br label %BB3
|
|
BB2: ; preds = %0
|
|
br label %BB3
|
|
BB3: ; preds = %BB2, %BB1
|
|
%Ret = phi i32 [ %Val, %BB1 ], [ 1, %BB2 ] ; <i32> [#uses=1]
|
|
ret i32 %Ret
|
|
|
|
; CHECK: @test1
|
|
; CHECK: %Ret = phi i32 [ 0, %BB1 ], [ 1, %BB2 ]
|
|
}
|
|
|
|
; This is the test case taken from appel's book that illustrates a hard case
|
|
; that SCCP gets right.
|
|
;
|
|
define i32 @test2(i32 %i0, i32 %j0) {
|
|
; CHECK: @test2
|
|
BB1:
|
|
br label %BB2
|
|
BB2:
|
|
%j2 = phi i32 [ %j4, %BB7 ], [ 1, %BB1 ]
|
|
%k2 = phi i32 [ %k4, %BB7 ], [ 0, %BB1 ]
|
|
%kcond = icmp slt i32 %k2, 100
|
|
br i1 %kcond, label %BB3, label %BB4
|
|
BB3:
|
|
%jcond = icmp slt i32 %j2, 20
|
|
br i1 %jcond, label %BB5, label %BB6
|
|
; CHECK: BB3:
|
|
; CHECK-NEXT: br i1 true, label %BB5, label %BB6
|
|
BB4:
|
|
ret i32 %j2
|
|
; CHECK: BB4:
|
|
; CHECK-NEXT: ret i32 1
|
|
BB5:
|
|
%k3 = add i32 %k2, 1
|
|
br label %BB7
|
|
BB6:
|
|
%k5 = add i32 %k2, 1
|
|
br label %BB7
|
|
; CHECK: BB6:
|
|
; CHECK-NEXT: br label %BB7
|
|
BB7:
|
|
%j4 = phi i32 [ 1, %BB5 ], [ %k2, %BB6 ]
|
|
%k4 = phi i32 [ %k3, %BB5 ], [ %k5, %BB6 ]
|
|
br label %BB2
|
|
; CHECK: BB7:
|
|
; CHECK-NEXT: %k4 = phi i32 [ %k3, %BB5 ], [ undef, %BB6 ]
|
|
; CHECK-NEXT: br label %BB2
|
|
}
|
|
|