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150 lines
3.5 KiB
LLVM
150 lines
3.5 KiB
LLVM
; Test 32-bit logical shifts right.
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;
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; RUN: llc < %s -mtriple=s390x-linux-gnu | FileCheck %s
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; Check the low end of the SRLG range.
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define i64 @f1(i64 %a) {
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; CHECK-LABEL: f1:
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; CHECK: srlg %r2, %r2, 1
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; CHECK: br %r14
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%shift = lshr i64 %a, 1
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ret i64 %shift
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}
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; Check the high end of the defined SRLG range.
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define i64 @f2(i64 %a) {
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; CHECK-LABEL: f2:
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; CHECK: srlg %r2, %r2, 63
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; CHECK: br %r14
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%shift = lshr i64 %a, 63
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ret i64 %shift
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}
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; We don't generate shifts by out-of-range values.
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define i64 @f3(i64 %a) {
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; CHECK-LABEL: f3:
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; CHECK-NOT: srlg
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; CHECK: br %r14
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%shift = lshr i64 %a, 64
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ret i64 %shift
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}
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; Check variable shifts.
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define i64 @f4(i64 %a, i64 %amt) {
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; CHECK-LABEL: f4:
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; CHECK: srlg %r2, %r2, 0(%r3)
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; CHECK: br %r14
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%shift = lshr i64 %a, %amt
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ret i64 %shift
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}
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; Check shift amounts that have a constant term.
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define i64 @f5(i64 %a, i64 %amt) {
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; CHECK-LABEL: f5:
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; CHECK: srlg %r2, %r2, 10(%r3)
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; CHECK: br %r14
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%add = add i64 %amt, 10
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%shift = lshr i64 %a, %add
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ret i64 %shift
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}
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; ...and again with a sign-extended 32-bit shift amount.
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define i64 @f6(i64 %a, i32 %amt) {
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; CHECK-LABEL: f6:
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; CHECK: srlg %r2, %r2, 10(%r3)
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; CHECK: br %r14
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%add = add i32 %amt, 10
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%addext = sext i32 %add to i64
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%shift = lshr i64 %a, %addext
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ret i64 %shift
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}
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; ...and now with a zero-extended 32-bit shift amount.
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define i64 @f7(i64 %a, i32 %amt) {
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; CHECK-LABEL: f7:
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; CHECK: srlg %r2, %r2, 10(%r3)
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; CHECK: br %r14
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%add = add i32 %amt, 10
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%addext = zext i32 %add to i64
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%shift = lshr i64 %a, %addext
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ret i64 %shift
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}
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; Check shift amounts that have the largest in-range constant term. We could
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; mask the amount instead.
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define i64 @f8(i64 %a, i64 %amt) {
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; CHECK-LABEL: f8:
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; CHECK: srlg %r2, %r2, 524287(%r3)
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; CHECK: br %r14
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%add = add i64 %amt, 524287
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%shift = lshr i64 %a, %add
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ret i64 %shift
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}
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; Check the next value up, which without masking must use a separate
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; addition.
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define i64 @f9(i64 %a, i64 %amt) {
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; CHECK-LABEL: f9:
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; CHECK: a{{g?}}fi %r3, 524288
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; CHECK: srlg %r2, %r2, 0(%r3)
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; CHECK: br %r14
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%add = add i64 %amt, 524288
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%shift = lshr i64 %a, %add
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ret i64 %shift
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}
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; Check cases where 1 is subtracted from the shift amount.
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define i64 @f10(i64 %a, i64 %amt) {
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; CHECK-LABEL: f10:
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; CHECK: srlg %r2, %r2, -1(%r3)
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; CHECK: br %r14
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%sub = sub i64 %amt, 1
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%shift = lshr i64 %a, %sub
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ret i64 %shift
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}
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; Check the lowest value that can be subtracted from the shift amount.
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; Again, we could mask the shift amount instead.
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define i64 @f11(i64 %a, i64 %amt) {
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; CHECK-LABEL: f11:
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; CHECK: srlg %r2, %r2, -524288(%r3)
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; CHECK: br %r14
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%sub = sub i64 %amt, 524288
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%shift = lshr i64 %a, %sub
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ret i64 %shift
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}
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; Check the next value down, which without masking must use a separate
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; addition.
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define i64 @f12(i64 %a, i64 %amt) {
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; CHECK-LABEL: f12:
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; CHECK: a{{g?}}fi %r3, -524289
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; CHECK: srlg %r2, %r2, 0(%r3)
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; CHECK: br %r14
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%sub = sub i64 %amt, 524289
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%shift = lshr i64 %a, %sub
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ret i64 %shift
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}
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; Check that we don't try to generate "indexed" shifts.
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define i64 @f13(i64 %a, i64 %b, i64 %c) {
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; CHECK-LABEL: f13:
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; CHECK: a{{g?}}r {{%r3, %r4|%r4, %r3}}
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; CHECK: srlg %r2, %r2, 0({{%r[34]}})
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; CHECK: br %r14
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%add = add i64 %b, %c
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%shift = lshr i64 %a, %add
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ret i64 %shift
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}
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; Check that the shift amount uses an address register. It cannot be in %r0.
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define i64 @f14(i64 %a, i64 *%ptr) {
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; CHECK-LABEL: f14:
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; CHECK: l %r1, 4(%r3)
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; CHECK: srlg %r2, %r2, 0(%r1)
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; CHECK: br %r14
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%amt = load i64, i64 *%ptr
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%shift = lshr i64 %a, %amt
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ret i64 %shift
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}
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