forked from OSchip/llvm-project
80 lines
2.6 KiB
LLVM
80 lines
2.6 KiB
LLVM
|
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
|
||
|
|
; RUN: opt < %s -basicaa -newgvn -S | FileCheck %s
|
||
|
|
|
||
|
|
;; Most of these are borrowed from transforms/DSE/simple.ll
|
||
|
|
;; NewGVN should be able to eliminate any stores of the same value that are actually redundnat.
|
||
|
|
|
||
|
|
;; tmp5 is store of the same value to the same location as the load.
|
||
|
|
define void @test12({ i32, i32 }* %x) nounwind {
|
||
|
|
; CHECK-LABEL: @test12(
|
||
|
|
; CHECK-NEXT: [[TMP4:%.*]] = getelementptr { i32, i32 }, { i32, i32 }* [[X:%.*]], i32 0, i32 0
|
||
|
|
; CHECK-NEXT: [[TMP5:%.*]] = load i32, i32* [[TMP4]], align 4
|
||
|
|
; CHECK-NEXT: [[TMP7:%.*]] = getelementptr { i32, i32 }, { i32, i32 }* [[X]], i32 0, i32 1
|
||
|
|
; CHECK-NEXT: [[TMP8:%.*]] = load i32, i32* [[TMP7]], align 4
|
||
|
|
; CHECK-NEXT: [[TMP17:%.*]] = sub i32 0, [[TMP8]]
|
||
|
|
; CHECK-NEXT: store i32 [[TMP17]], i32* [[TMP7]], align 4
|
||
|
|
; CHECK-NEXT: ret void
|
||
|
|
;
|
||
|
|
%tmp4 = getelementptr { i32, i32 }, { i32, i32 }* %x, i32 0, i32 0
|
||
|
|
%tmp5 = load i32, i32* %tmp4, align 4
|
||
|
|
%tmp7 = getelementptr { i32, i32 }, { i32, i32 }* %x, i32 0, i32 1
|
||
|
|
%tmp8 = load i32, i32* %tmp7, align 4
|
||
|
|
%tmp17 = sub i32 0, %tmp8
|
||
|
|
store i32 %tmp5, i32* %tmp4, align 4
|
||
|
|
store i32 %tmp17, i32* %tmp7, align 4
|
||
|
|
ret void
|
||
|
|
}
|
||
|
|
; Remove redundant store if loaded value is in another block.
|
||
|
|
define i32 @test26(i1 %c, i32* %p) {
|
||
|
|
; CHECK-LABEL: @test26(
|
||
|
|
; CHECK-NEXT: entry:
|
||
|
|
; CHECK-NEXT: [[V:%.*]] = load i32, i32* [[P:%.*]], align 4
|
||
|
|
; CHECK-NEXT: br i1 [[C:%.*]], label [[BB1:%.*]], label [[BB2:%.*]]
|
||
|
|
; CHECK: bb1:
|
||
|
|
; CHECK-NEXT: br label [[BB3:%.*]]
|
||
|
|
; CHECK: bb2:
|
||
|
|
; CHECK-NEXT: br label [[BB3]]
|
||
|
|
; CHECK: bb3:
|
||
|
|
; CHECK-NEXT: ret i32 0
|
||
|
|
;
|
||
|
|
entry:
|
||
|
|
%v = load i32, i32* %p, align 4
|
||
|
|
br i1 %c, label %bb1, label %bb2
|
||
|
|
bb1:
|
||
|
|
br label %bb3
|
||
|
|
bb2:
|
||
|
|
store i32 %v, i32* %p, align 4
|
||
|
|
br label %bb3
|
||
|
|
bb3:
|
||
|
|
ret i32 0
|
||
|
|
}
|
||
|
|
|
||
|
|
declare void @unknown_func()
|
||
|
|
; Remove redundant store, which is in the same loop as the load.
|
||
|
|
define i32 @test33(i1 %c, i32* %p, i32 %i) {
|
||
|
|
; CHECK-LABEL: @test33(
|
||
|
|
; CHECK-NEXT: entry:
|
||
|
|
; CHECK-NEXT: br label [[BB1:%.*]]
|
||
|
|
; CHECK: bb1:
|
||
|
|
; CHECK-NEXT: [[V:%.*]] = load i32, i32* [[P:%.*]], align 4
|
||
|
|
; CHECK-NEXT: br label [[BB2:%.*]]
|
||
|
|
; CHECK: bb2:
|
||
|
|
; CHECK-NEXT: call void @unknown_func()
|
||
|
|
; CHECK-NEXT: br i1 undef, label [[BB1]], label [[BB3:%.*]]
|
||
|
|
; CHECK: bb3:
|
||
|
|
; CHECK-NEXT: ret i32 0
|
||
|
|
;
|
||
|
|
entry:
|
||
|
|
br label %bb1
|
||
|
|
bb1:
|
||
|
|
%v = load i32, i32* %p, align 4
|
||
|
|
br label %bb2
|
||
|
|
bb2:
|
||
|
|
store i32 %v, i32* %p, align 4
|
||
|
|
; Might read and overwrite value at %p, but doesn't matter.
|
||
|
|
call void @unknown_func()
|
||
|
|
br i1 undef, label %bb1, label %bb3
|
||
|
|
bb3:
|
||
|
|
ret i32 0
|
||
|
|
}
|