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; Test LOCG.
;
; RUN: llc < %s -mtriple=s390x-linux-gnu -mcpu=z196 | FileCheck %s
declare i64 @foo(ptr)
; Test the simple case.
define i64 @f1(i64 %easy, ptr %ptr, i64 %limit) {
; CHECK-LABEL: f1:
; CHECK: clgfi %r4, 42
; CHECK: locghe %r2, 0(%r3)
; CHECK: br %r14
%cond = icmp ult i64 %limit, 42
%other = load i64, ptr %ptr
%res = select i1 %cond, i64 %easy, i64 %other
ret i64 %res
}
; ...and again with the operands swapped.
define i64 @f2(i64 %easy, ptr %ptr, i64 %limit) {
; CHECK-LABEL: f2:
; CHECK: clgfi %r4, 42
; CHECK: locgl %r2, 0(%r3)
; CHECK: br %r14
%cond = icmp ult i64 %limit, 42
%other = load i64, ptr %ptr
%res = select i1 %cond, i64 %other, i64 %easy
ret i64 %res
}
; Check the high end of the aligned LOCG range.
define i64 @f3(i64 %easy, ptr %base, i64 %limit) {
; CHECK-LABEL: f3:
; CHECK: clgfi %r4, 42
; CHECK: locghe %r2, 524280(%r3)
; CHECK: br %r14
%ptr = getelementptr i64, ptr %base, i64 65535
%cond = icmp ult i64 %limit, 42
%other = load i64, ptr %ptr
%res = select i1 %cond, i64 %easy, i64 %other
ret i64 %res
}
; Check the next doubleword up. Other sequences besides this one would be OK.
define i64 @f4(i64 %easy, ptr %base, i64 %limit) {
; CHECK-LABEL: f4:
; CHECK: agfi %r3, 524288
; CHECK: clgfi %r4, 42
; CHECK: locghe %r2, 0(%r3)
; CHECK: br %r14
%ptr = getelementptr i64, ptr %base, i64 65536
%cond = icmp ult i64 %limit, 42
%other = load i64, ptr %ptr
%res = select i1 %cond, i64 %easy, i64 %other
ret i64 %res
}
; Check the low end of the LOCG range.
define i64 @f5(i64 %easy, ptr %base, i64 %limit) {
; CHECK-LABEL: f5:
; CHECK: clgfi %r4, 42
; CHECK: locghe %r2, -524288(%r3)
; CHECK: br %r14
%ptr = getelementptr i64, ptr %base, i64 -65536
%cond = icmp ult i64 %limit, 42
%other = load i64, ptr %ptr
%res = select i1 %cond, i64 %easy, i64 %other
ret i64 %res
}
; Check the next doubleword down, with the same comments as f4.
define i64 @f6(i64 %easy, ptr %base, i64 %limit) {
; CHECK-LABEL: f6:
; CHECK: agfi %r3, -524296
; CHECK: clgfi %r4, 42
; CHECK: locghe %r2, 0(%r3)
; CHECK: br %r14
%ptr = getelementptr i64, ptr %base, i64 -65537
%cond = icmp ult i64 %limit, 42
%other = load i64, ptr %ptr
%res = select i1 %cond, i64 %easy, i64 %other
ret i64 %res
}
; Try a frame index base.
define i64 @f7(i64 %alt, i64 %limit) {
; CHECK-LABEL: f7:
; CHECK: brasl %r14, foo@PLT
; CHECK: locghe %r2, {{[0-9]+}}(%r15)
; CHECK: br %r14
%ptr = alloca i64
%easy = call i64 @foo(ptr %ptr)
%cond = icmp ult i64 %limit, 42
%other = load i64, ptr %ptr
%res = select i1 %cond, i64 %easy, i64 %other
ret i64 %res
}
; Try a case when an index is involved.
define i64 @f8(i64 %easy, i64 %limit, i64 %base, i64 %index) {
; CHECK-LABEL: f8:
; CHECK: clgfi %r3, 42
; CHECK: locghe %r2, 0({{%r[1-5]}})
; CHECK: br %r14
%add = add i64 %base, %index
%ptr = inttoptr i64 %add to ptr
%cond = icmp ult i64 %limit, 42
%other = load i64, ptr %ptr
%res = select i1 %cond, i64 %easy, i64 %other
ret i64 %res
}
; Test that conditionally-executed loads do not use LOCG, since it is allowed
; to trap even when the condition is false.
define i64 @f9(i64 %easy, i64 %limit, ptr %ptr) {
; CHECK-LABEL: f9:
; CHECK-NOT: locg
; CHECK: br %r14
entry:
%cmp = icmp ule i64 %easy, %limit
br i1 %cmp, label %load, label %exit
load:
%other = load i64, ptr %ptr
br label %exit
exit:
%res = phi i64 [ %easy, %entry ], [ %other, %load ]
ret i64 %res
}
; Test that volatile loads do not use LOCG, since if the condition is false,
; it is unspecified whether or not the load happens. LOCGR is fine though.
define i64 @f10(i64 %easy, ptr %ptr, i64 %limit) {
; CHECK-LABEL: f10:
; CHECK: lg {{%r[0-9]*}}, 0(%r3)
; CHECK: locgr
; CHECK: br %r14
%cond = icmp ult i64 %limit, 42
%other = load volatile i64, ptr %ptr
%res = select i1 %cond, i64 %easy, i64 %other
ret i64 %res
}
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