mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2024-07-31 10:29:25 +00:00
ec63ad6c1f
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@84405 91177308-0d34-0410-b5e6-96231b3b80d8
91 lines
2.1 KiB
LLVM
91 lines
2.1 KiB
LLVM
; RUN: opt < %s -basicaa -gvn -dse -S | FileCheck %s
|
|
|
|
declare void @llvm.memset.i32(i8*, i8, i32, i32)
|
|
declare void @llvm.memset.i8(i8*, i8, i8, i32)
|
|
declare void @llvm.memcpy.i8(i8*, i8*, i8, i32)
|
|
declare void @llvm.lifetime.end(i64, i8* nocapture)
|
|
|
|
declare void @external(i32*)
|
|
|
|
define i32 @test0(i8* %P) {
|
|
%A = alloca i32
|
|
call void @external(i32* %A)
|
|
|
|
store i32 0, i32* %A
|
|
|
|
call void @llvm.memset.i32(i8* %P, i8 0, i32 42, i32 1)
|
|
|
|
%B = load i32* %A
|
|
ret i32 %B
|
|
|
|
; CHECK: @test0
|
|
; CHECK: ret i32 0
|
|
}
|
|
|
|
declare void @llvm.memcpy.i8(i8*, i8*, i8, i32)
|
|
|
|
define i8 @test1() {
|
|
; CHECK: @test1
|
|
%A = alloca i8
|
|
%B = alloca i8
|
|
|
|
store i8 2, i8* %B ;; Not written to by memcpy
|
|
|
|
call void @llvm.memcpy.i8(i8* %A, i8* %B, i8 -1, i32 0)
|
|
|
|
%C = load i8* %B
|
|
ret i8 %C
|
|
; CHECK: ret i8 2
|
|
}
|
|
|
|
define i8 @test2(i8* %P) {
|
|
; CHECK: @test2
|
|
%P2 = getelementptr i8* %P, i32 127
|
|
store i8 1, i8* %P2 ;; Not dead across memset
|
|
call void @llvm.memset.i8(i8* %P, i8 2, i8 127, i32 0)
|
|
%A = load i8* %P2
|
|
ret i8 %A
|
|
; CHECK: ret i8 1
|
|
}
|
|
|
|
define i8 @test2a(i8* %P) {
|
|
; CHECK: @test2
|
|
%P2 = getelementptr i8* %P, i32 126
|
|
|
|
;; FIXME: DSE isn't zapping this dead store.
|
|
store i8 1, i8* %P2 ;; Dead, clobbered by memset.
|
|
|
|
call void @llvm.memset.i8(i8* %P, i8 2, i8 127, i32 0)
|
|
%A = load i8* %P2
|
|
ret i8 %A
|
|
; CHECK: %A = load i8* %P2
|
|
; CHECK: ret i8 %A
|
|
}
|
|
|
|
define void @test3(i8* %P, i8 %X) {
|
|
; CHECK: @test3
|
|
; CHECK-NOT: store
|
|
; CHECK-NOT: %Y
|
|
%Y = add i8 %X, 1 ;; Dead, because the only use (the store) is dead.
|
|
|
|
%P2 = getelementptr i8* %P, i32 2
|
|
store i8 %Y, i8* %P2 ;; Not read by lifetime.end, should be removed.
|
|
; CHECK: store i8 2, i8* %P2
|
|
call void @llvm.lifetime.end(i64 1, i8* %P)
|
|
store i8 2, i8* %P2
|
|
; CHECK-NOT: store
|
|
ret void
|
|
; CHECK: ret void
|
|
}
|
|
|
|
define void @test3a(i8* %P, i8 %X) {
|
|
; CHECK: @test3a
|
|
%Y = add i8 %X, 1 ;; Dead, because the only use (the store) is dead.
|
|
|
|
%P2 = getelementptr i8* %P, i32 2
|
|
store i8 %Y, i8* %P2 ;; FIXME: Killed by llvm.lifetime.end, should be zapped.
|
|
; CHECK: store i8 %Y, i8* %P2
|
|
call void @llvm.lifetime.end(i64 10, i8* %P)
|
|
ret void
|
|
; CHECK: ret void
|
|
} |