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c7495a0fca
Add a mapping from register-based <INSN>R instructions to the corresponding memory-based <INSN>. Use it to cut down on the number of spill loads. Some instructions extend their operands from smaller fields, so this required a new TSFlags field to say how big the unextended operand is. This optimisation doesn't trigger for C(G)R and CL(G)R because in practice we always combine those instructions with a branch. Adding a test for every other case probably seems excessive, but it did catch a missed optimisation for DSGF (fixed in r185435). llvm-svn: 185529
144 lines
3.9 KiB
LLVM
144 lines
3.9 KiB
LLVM
; Test 128-bit addition in which the second operand is variable.
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;
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; RUN: llc < %s -mtriple=s390x-linux-gnu | FileCheck %s
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declare i128 *@foo()
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; Test register addition.
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define void @f1(i128 *%ptr) {
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; CHECK: f1:
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; CHECK: algr
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; CHECK: alcgr
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; CHECK: br %r14
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%value = load i128 *%ptr
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%add = add i128 %value, %value
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store i128 %add, i128 *%ptr
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ret void
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}
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; Test memory addition with no offset. Making the load of %a volatile
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; should force the memory operand to be %b.
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define void @f2(i128 *%aptr, i64 %addr) {
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; CHECK: f2:
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; CHECK: alg {{%r[0-5]}}, 8(%r3)
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; CHECK: alcg {{%r[0-5]}}, 0(%r3)
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; CHECK: br %r14
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%bptr = inttoptr i64 %addr to i128 *
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%a = load volatile i128 *%aptr
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%b = load i128 *%bptr
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%add = add i128 %a, %b
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store i128 %add, i128 *%aptr
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ret void
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}
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; Test the highest aligned offset that is in range of both ALG and ALCG.
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define void @f3(i128 *%aptr, i64 %base) {
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; CHECK: f3:
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; CHECK: alg {{%r[0-5]}}, 524280(%r3)
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; CHECK: alcg {{%r[0-5]}}, 524272(%r3)
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; CHECK: br %r14
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%addr = add i64 %base, 524272
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%bptr = inttoptr i64 %addr to i128 *
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%a = load volatile i128 *%aptr
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%b = load i128 *%bptr
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%add = add i128 %a, %b
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store i128 %add, i128 *%aptr
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ret void
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}
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; Test the next doubleword up, which requires separate address logic for ALG.
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define void @f4(i128 *%aptr, i64 %base) {
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; CHECK: f4:
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; CHECK: lgr [[BASE:%r[1-5]]], %r3
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; CHECK: agfi [[BASE]], 524288
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; CHECK: alg {{%r[0-5]}}, 0([[BASE]])
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; CHECK: alcg {{%r[0-5]}}, 524280(%r3)
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; CHECK: br %r14
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%addr = add i64 %base, 524280
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%bptr = inttoptr i64 %addr to i128 *
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%a = load volatile i128 *%aptr
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%b = load i128 *%bptr
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%add = add i128 %a, %b
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store i128 %add, i128 *%aptr
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ret void
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}
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; Test the next doubleword after that, which requires separate logic for
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; both instructions. It would be better to create an anchor at 524288
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; that both instructions can use, but that isn't implemented yet.
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define void @f5(i128 *%aptr, i64 %base) {
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; CHECK: f5:
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; CHECK: alg {{%r[0-5]}}, 0({{%r[1-5]}})
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; CHECK: alcg {{%r[0-5]}}, 0({{%r[1-5]}})
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; CHECK: br %r14
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%addr = add i64 %base, 524288
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%bptr = inttoptr i64 %addr to i128 *
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%a = load volatile i128 *%aptr
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%b = load i128 *%bptr
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%add = add i128 %a, %b
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store i128 %add, i128 *%aptr
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ret void
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}
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; Test the lowest displacement that is in range of both ALG and ALCG.
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define void @f6(i128 *%aptr, i64 %base) {
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; CHECK: f6:
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; CHECK: alg {{%r[0-5]}}, -524280(%r3)
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; CHECK: alcg {{%r[0-5]}}, -524288(%r3)
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; CHECK: br %r14
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%addr = add i64 %base, -524288
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%bptr = inttoptr i64 %addr to i128 *
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%a = load volatile i128 *%aptr
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%b = load i128 *%bptr
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%add = add i128 %a, %b
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store i128 %add, i128 *%aptr
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ret void
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}
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; Test the next doubleword down, which is out of range of the ALCG.
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define void @f7(i128 *%aptr, i64 %base) {
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; CHECK: f7:
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; CHECK: alg {{%r[0-5]}}, -524288(%r3)
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; CHECK: alcg {{%r[0-5]}}, 0({{%r[1-5]}})
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; CHECK: br %r14
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%addr = add i64 %base, -524296
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%bptr = inttoptr i64 %addr to i128 *
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%a = load volatile i128 *%aptr
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%b = load i128 *%bptr
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%add = add i128 %a, %b
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store i128 %add, i128 *%aptr
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ret void
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}
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; Check that additions of spilled values can use ALG and ALCG rather than
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; ALGR and ALCGR.
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define void @f8(i128 *%ptr0) {
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; CHECK: f8:
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; CHECK: brasl %r14, foo@PLT
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; CHECK: alg {{%r[0-9]+}}, {{[0-9]+}}(%r15)
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; CHECK: alcg {{%r[0-9]+}}, {{[0-9]+}}(%r15)
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; CHECK: br %r14
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%ptr1 = getelementptr i128 *%ptr0, i128 2
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%ptr2 = getelementptr i128 *%ptr0, i128 4
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%ptr3 = getelementptr i128 *%ptr0, i128 6
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%ptr4 = getelementptr i128 *%ptr0, i128 8
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%val0 = load i128 *%ptr0
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%val1 = load i128 *%ptr1
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%val2 = load i128 *%ptr2
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%val3 = load i128 *%ptr3
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%val4 = load i128 *%ptr4
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%retptr = call i128 *@foo()
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%ret = load i128 *%retptr
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%add0 = add i128 %ret, %val0
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%add1 = add i128 %add0, %val1
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%add2 = add i128 %add1, %val2
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%add3 = add i128 %add2, %val3
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%add4 = add i128 %add3, %val4
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store i128 %add4, i128 *%retptr
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ret void
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}
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