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[tests] precommit test for an upcoming change

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This commit is contained in:
Philip Reames 2021-03-09 11:39:10 -08:00
parent bbe082f248
commit 72e71e056e
1 changed files with 99 additions and 0 deletions
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99
test/CodeGen/X86/usub_inc_iv.ll
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@ -306,3 +306,102 @@ exit: ; preds = %loop
failure: ; preds = %backedge
unreachable
}
; test_01, but with an additional use of %iv.next outside the loop
define i32 @test_06(i32* %p, i64 %len, i32 %x) {
; CHECK-LABEL: @test_06(
; CHECK-NEXT: entry:
; CHECK-NEXT: br label [[LOOP:%.*]]
; CHECK: loop:
; CHECK-NEXT: [[IV:%.*]] = phi i64 [ [[IV_NEXT:%.*]], [[BACKEDGE:%.*]] ], [ [[LEN:%.*]], [[ENTRY:%.*]] ]
; CHECK-NEXT: [[COND_1:%.*]] = icmp eq i64 [[IV]], 0
; CHECK-NEXT: br i1 [[COND_1]], label [[EXIT:%.*]], label [[BACKEDGE]]
; CHECK: backedge:
; CHECK-NEXT: [[SUNKADDR:%.*]] = mul i64 [[IV]], 4
; CHECK-NEXT: [[TMP0:%.*]] = bitcast i32* [[P:%.*]] to i8*
; CHECK-NEXT: [[SUNKADDR1:%.*]] = getelementptr i8, i8* [[TMP0]], i64 [[SUNKADDR]]
; CHECK-NEXT: [[SUNKADDR2:%.*]] = getelementptr i8, i8* [[SUNKADDR1]], i64 -4
; CHECK-NEXT: [[TMP1:%.*]] = bitcast i8* [[SUNKADDR2]] to i32*
; CHECK-NEXT: [[LOADED:%.*]] = load atomic i32, i32* [[TMP1]] unordered, align 4
; CHECK-NEXT: [[IV_NEXT]] = add i64 [[IV]], -1
; CHECK-NEXT: [[COND_2:%.*]] = icmp eq i32 [[LOADED]], [[X:%.*]]
; CHECK-NEXT: br i1 [[COND_2]], label [[FAILURE:%.*]], label [[LOOP]]
; CHECK: exit:
; CHECK-NEXT: ret i32 -1
; CHECK: failure:
; CHECK-NEXT: [[TRUNC:%.*]] = trunc i64 [[IV_NEXT]] to i32
; CHECK-NEXT: ret i32 [[TRUNC]]
;
entry:
%scevgep = getelementptr i32, i32* %p, i64 -1
br label %loop
loop: ; preds = %backedge, %entry
%iv = phi i64 [ %iv.next, %backedge ], [ %len, %entry ]
%cond_1 = icmp eq i64 %iv, 0
br i1 %cond_1, label %exit, label %backedge
backedge: ; preds = %loop
%scevgep1 = getelementptr i32, i32* %scevgep, i64 %iv
%loaded = load atomic i32, i32* %scevgep1 unordered, align 4
%iv.next = add i64 %iv, -1
%cond_2 = icmp eq i32 %loaded, %x
br i1 %cond_2, label %failure, label %loop
exit:
ret i32 -1
failure:
%trunc = trunc i64 %iv.next to i32
ret i32 %trunc
}
; Extra use outside loop which prevents us moving the increment to the cmp
define i32 @test_07_neg(i32* %p, i64 %len, i32 %x) {
; CHECK-LABEL: @test_07_neg(
; CHECK-NEXT: entry:
; CHECK-NEXT: br label [[LOOP:%.*]]
; CHECK: loop:
; CHECK-NEXT: [[IV:%.*]] = phi i64 [ [[IV_NEXT:%.*]], [[BACKEDGE:%.*]] ], [ [[LEN:%.*]], [[ENTRY:%.*]] ]
; CHECK-NEXT: [[IV_NEXT]] = add i64 [[IV]], -1
; CHECK-NEXT: [[SUNKADDR:%.*]] = mul i64 [[IV_NEXT]], 4
; CHECK-NEXT: [[TMP0:%.*]] = bitcast i32* [[P:%.*]] to i8*
; CHECK-NEXT: [[SUNKADDR1:%.*]] = getelementptr i8, i8* [[TMP0]], i64 [[SUNKADDR]]
; CHECK-NEXT: [[TMP1:%.*]] = bitcast i8* [[SUNKADDR1]] to i32*
; CHECK-NEXT: [[LOADED:%.*]] = load atomic i32, i32* [[TMP1]] unordered, align 4
; CHECK-NEXT: [[COND_2:%.*]] = icmp eq i32 [[LOADED]], [[X:%.*]]
; CHECK-NEXT: br i1 [[COND_2]], label [[FAILURE:%.*]], label [[BACKEDGE]]
; CHECK: backedge:
; CHECK-NEXT: [[COND_1:%.*]] = icmp eq i64 [[IV]], 0
; CHECK-NEXT: br i1 [[COND_1]], label [[EXIT:%.*]], label [[LOOP]]
; CHECK: exit:
; CHECK-NEXT: ret i32 -1
; CHECK: failure:
; CHECK-NEXT: [[TRUNC:%.*]] = trunc i64 [[IV_NEXT]] to i32
; CHECK-NEXT: ret i32 [[TRUNC]]
;
entry:
%scevgep = getelementptr i32, i32* %p, i64 -1
br label %loop
loop:
%iv = phi i64 [ %iv.next, %backedge ], [ %len, %entry ]
%iv.next = add i64 %iv, -1
%scevgep1 = getelementptr i32, i32* %scevgep, i64 %iv
%loaded = load atomic i32, i32* %scevgep1 unordered, align 4
%cond_2 = icmp eq i32 %loaded, %x
br i1 %cond_2, label %failure, label %backedge
backedge:
%cond_1 = icmp eq i64 %iv, 0
br i1 %cond_1, label %exit, label %loop
exit:
ret i32 -1
failure:
%trunc = trunc i64 %iv.next to i32
ret i32 %trunc
}