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b3f912b510
r186399 aggressively used the RISBG instruction for immediate ANDs, both because it can handle some values that AND IMMEDIATE can't, and because it allows the destination register to be different from the source. I realized later while implementing the distinct-ops support that it would be better to leave the choice up to convertToThreeAddress() instead. The AND IMMEDIATE form is shorter and is less likely to be cracked. This is a problem for 32-bit ANDs because we assume that all 32-bit operations will leave the high word untouched, whereas RISBG used in this way will either clear the high word or copy it from the source register. The patch uses the z196 instruction RISBLG for this instead. This means that z10 will be restricted to NILL, NILH and NILF for 32-bit ANDs, but I think that should be OK for now. Although we're using z10 as the base architecture, the optimization work is going to be focused more on z196 and zEC12. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@187492 91177308-0d34-0410-b5e6-96231b3b80d8
108 lines
2.7 KiB
LLVM
108 lines
2.7 KiB
LLVM
; Test selection of addresses with indices in cases where the address
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; is used once.
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;
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; RUN: llc < %s -mtriple=s390x-linux-gnu | FileCheck %s
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; A simple index address.
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define void @f1(i64 %addr, i64 %index) {
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; CHECK-LABEL: f1:
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; CHECK: lb %r0, 0(%r3,%r2)
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; CHECK: br %r14
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%add = add i64 %addr, %index
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%ptr = inttoptr i64 %add to i8 *
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%a = load volatile i8 *%ptr
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ret void
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}
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; An address with an index and a displacement (order 1).
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define void @f2(i64 %addr, i64 %index) {
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; CHECK-LABEL: f2:
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; CHECK: lb %r0, 100(%r3,%r2)
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; CHECK: br %r14
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%add1 = add i64 %addr, %index
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%add2 = add i64 %add1, 100
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%ptr = inttoptr i64 %add2 to i8 *
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%a = load volatile i8 *%ptr
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ret void
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}
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; An address with an index and a displacement (order 2).
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define void @f3(i64 %addr, i64 %index) {
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; CHECK-LABEL: f3:
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; CHECK: lb %r0, 100(%r3,%r2)
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; CHECK: br %r14
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%add1 = add i64 %addr, 100
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%add2 = add i64 %add1, %index
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%ptr = inttoptr i64 %add2 to i8 *
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%a = load volatile i8 *%ptr
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ret void
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}
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; An address with an index and a subtracted displacement (order 1).
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define void @f4(i64 %addr, i64 %index) {
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; CHECK-LABEL: f4:
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; CHECK: lb %r0, -100(%r3,%r2)
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; CHECK: br %r14
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%add1 = add i64 %addr, %index
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%add2 = sub i64 %add1, 100
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%ptr = inttoptr i64 %add2 to i8 *
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%a = load volatile i8 *%ptr
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ret void
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}
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; An address with an index and a subtracted displacement (order 2).
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define void @f5(i64 %addr, i64 %index) {
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; CHECK-LABEL: f5:
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; CHECK: lb %r0, -100(%r3,%r2)
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; CHECK: br %r14
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%add1 = sub i64 %addr, 100
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%add2 = add i64 %add1, %index
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%ptr = inttoptr i64 %add2 to i8 *
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%a = load volatile i8 *%ptr
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ret void
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}
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; An address with an index and a displacement added using OR.
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define void @f6(i64 %addr, i64 %index) {
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; CHECK-LABEL: f6:
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; CHECK: nill %r2, 65528
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; CHECK: lb %r0, 6(%r3,%r2)
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; CHECK: br %r14
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%aligned = and i64 %addr, -8
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%or = or i64 %aligned, 6
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%add = add i64 %or, %index
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%ptr = inttoptr i64 %add to i8 *
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%a = load volatile i8 *%ptr
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ret void
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}
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; Like f6, but without the masking. This OR doesn't count as a displacement.
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define void @f7(i64 %addr, i64 %index) {
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; CHECK-LABEL: f7:
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; CHECK: oill %r2, 6
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; CHECK: lb %r0, 0(%r3,%r2)
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; CHECK: br %r14
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%or = or i64 %addr, 6
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%add = add i64 %or, %index
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%ptr = inttoptr i64 %add to i8 *
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%a = load volatile i8 *%ptr
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ret void
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}
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; Like f6, but with the OR applied after the index. We don't know anything
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; about the alignment of %add here.
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define void @f8(i64 %addr, i64 %index) {
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; CHECK-LABEL: f8:
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; CHECK: nill %r2, 65528
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; CHECK: agr %r2, %r3
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; CHECK: oill %r2, 6
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; CHECK: lb %r0, 0(%r2)
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; CHECK: br %r14
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%aligned = and i64 %addr, -8
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%add = add i64 %aligned, %index
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%or = or i64 %add, 6
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%ptr = inttoptr i64 %or to i8 *
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%a = load volatile i8 *%ptr
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ret void
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}
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