llvm-mirror/test/CodeGen/SystemZ/int-cmp-35.ll

; Test 64-bit unsigned comparisons between memory and a constant.
;
; RUN: llc < %s -mtriple=s390x-linux-gnu | FileCheck %s

; Check ordered comparisons with a constant near the low end of the unsigned
; 16-bit range.
define double @f1(double %a, double %b, i64 *%ptr) {
; CHECK: f1:
; CHECK: clghsi 0(%r2), 2
; CHECK-NEXT: jl
; CHECK: ldr %f0, %f2
; CHECK: br %r14
  %val = load i64 *%ptr
  %cond = icmp ult i64 %val, 2
  %res = select i1 %cond, double %a, double %b
  ret double %res
}

; Check ordered comparisons with the high end of the unsigned 16-bit range.
define double @f2(double %a, double %b, i64 *%ptr) {
; CHECK: f2:
; CHECK: clghsi 0(%r2), 65535
; CHECK-NEXT: jl
; CHECK: ldr %f0, %f2
; CHECK: br %r14
  %val = load i64 *%ptr
  %cond = icmp ult i64 %val, 65535
  %res = select i1 %cond, double %a, double %b
  ret double %res
}

; Check the next value up, which can't use CLGHSI.
define double @f3(double %a, double %b, i64 *%ptr) {
; CHECK: f3:
; CHECK-NOT: clghsi
; CHECK: br %r14
  %val = load i64 *%ptr
  %cond = icmp ult i64 %val, 65536
  %res = select i1 %cond, double %a, double %b
  ret double %res
}

; Check equality comparisons with 32768, the lowest value for which
; we prefer CLGHSI to CGHSI.
define double @f4(double %a, double %b, i64 *%ptr) {
; CHECK: f4:
; CHECK: clghsi 0(%r2), 32768
; CHECK-NEXT: je
; CHECK: ldr %f0, %f2
; CHECK: br %r14
  %val = load i64 *%ptr
  %cond = icmp eq i64 %val, 32768
  %res = select i1 %cond, double %a, double %b
  ret double %res
}

; Check equality comparisons with the high end of the unsigned 16-bit range.
define double @f5(double %a, double %b, i64 *%ptr) {
; CHECK: f5:
; CHECK: clghsi 0(%r2), 65535
; CHECK-NEXT: je
; CHECK: ldr %f0, %f2
; CHECK: br %r14
  %val = load i64 *%ptr
  %cond = icmp eq i64 %val, 65535
  %res = select i1 %cond, double %a, double %b
  ret double %res
}

; Check the next value up, which can't use CLGHSI.
define double @f6(double %a, double %b, i64 *%ptr) {
; CHECK: f6:
; CHECK-NOT: clghsi
; CHECK: br %r14
  %val = load i64 *%ptr
  %cond = icmp eq i64 %val, 65536
  %res = select i1 %cond, double %a, double %b
  ret double %res
}

; Check the high end of the CLGHSI range.
define double @f7(double %a, double %b, i64 %i1, i64 *%base) {
; CHECK: f7:
; CHECK: clghsi 4088(%r3), 2
; CHECK-NEXT: jl
; CHECK: ldr %f0, %f2
; CHECK: br %r14
  %ptr = getelementptr i64 *%base, i64 511
  %val = load i64 *%ptr
  %cond = icmp ult i64 %val, 2
  %res = select i1 %cond, double %a, double %b
  ret double %res
}

; Check the next doubleword up, which needs separate address logic,
define double @f8(double %a, double %b, i64 *%base) {
; CHECK: f8:
; CHECK: aghi %r2, 4096
; CHECK: clghsi 0(%r2), 2
; CHECK-NEXT: jl
; CHECK: ldr %f0, %f2
; CHECK: br %r14
  %ptr = getelementptr i64 *%base, i64 512
  %val = load i64 *%ptr
  %cond = icmp ult i64 %val, 2
  %res = select i1 %cond, double %a, double %b
  ret double %res
}

; Check negative offsets, which also need separate address logic.
define double @f9(double %a, double %b, i64 *%base) {
; CHECK: f9:
; CHECK: aghi %r2, -8
; CHECK: clghsi 0(%r2), 2
; CHECK-NEXT: jl
; CHECK: ldr %f0, %f2
; CHECK: br %r14
  %ptr = getelementptr i64 *%base, i64 -1
  %val = load i64 *%ptr
  %cond = icmp ult i64 %val, 2
  %res = select i1 %cond, double %a, double %b
  ret double %res
}

; Check that CLGHSI does not allow indices.
define double @f10(double %a, double %b, i64 %base, i64 %index) {
; CHECK: f10:
; CHECK: agr {{%r2, %r3|%r3, %r2}}
; CHECK: clghsi 0({{%r[23]}}), 2
; CHECK-NEXT: jl
; CHECK: ldr %f0, %f2
; CHECK: br %r14
  %add = add i64 %base, %index
  %ptr = inttoptr i64 %add to i64 *
  %val = load i64 *%ptr
  %cond = icmp ult i64 %val, 2
  %res = select i1 %cond, double %a, double %b
  ret double %res
}