CodeGen: Power: Add lowering for shifts of v1i128.

When legalizing vector operations on vNi128, they will be split to v1i128
because that is a legal type on ppc64, but then the compiler will crash in
selection dag because it fails to select for these operations. This patch fixes
shift operations. Logical shift right and left shift can be performed in the
vector unit, but algebraic shift right requires being split.

Differential Revision: https://reviews.llvm.org/D32774

llvm-svn: 303307

1 files changed, 88 insertions, 4 deletions

diff --git a/llvm/test/CodeGen/PowerPC/shift128.ll b/llvm/test/CodeGen/PowerPC/shift128.ll
index 17a380c71c3..48e1b96f838 100644
--- a/llvm/test/CodeGen/PowerPC/shift128.ll
+++ b/llvm/test/CodeGen/PowerPC/shift128.ll
@@ -1,14 +1,98 @@
-; RUN: llc -verify-machineinstrs < %s -march=ppc64 | grep sld | count 5
+; RUN: llc -verify-machineinstrs < %s | FileCheck --check-prefix=P8 --check-prefix=CHECK %s
+; RUN: llc -mcpu=pwr9 -verify-machineinstrs < %s | FileCheck --check-prefix=P9 --check-prefix=CHECK %s
+target datalayout = "e-m:e-i64:64-n32:64"
+target triple = "powerpc64le-unknown-linux-gnu"
 
-define i128 @foo_lshr(i128 %x, i128 %y) {
+; CHECK-LABEL: lshr:
+; CHECK-DAG: subfic [[R0:[0-9]+]], 5, 64
+; CHECK-DAG: addi [[R1:[0-9]+]], 5, -64
+; CHECK-DAG: srd [[R2:[0-9]+]], 3, 5
+; CHECK-DAG: sld [[R3:[0-9]+]], 4, [[R0]]
+; CHECK-DAG: srd [[R4:[0-9]+]], 4, [[R1]]
+; CHECK-DAG: or [[R5:[0-9]+]], [[R2]], [[R3]]
+; CHECK-DAG: or 3, [[R5]], [[R4]]
+; CHECK-DAG: srd 4, 4, 5
+; CHECK: blr
+define i128 @lshr(i128 %x, i128 %y) {
   %r = lshr i128 %x, %y
   ret i128 %r
 }
-define i128 @foo_ashr(i128 %x, i128 %y) {
+; CHECK-LABEL: ashr:
+; CHECK-DAG: subfic [[R0:[0-9]+]], 5, 64
+; CHECK-DAG: addi [[R1:[0-9]+]], 5, -64
+; CHECK-DAG: srd [[R2:[0-9]+]], 3, 5
+; CHECK-DAG: sld [[R3:[0-9]+]], 4, [[R0]]
+; CHECK-DAG: srad [[R4:[0-9]+]], 4, [[R1]]
+; CHECK-DAG: or [[R5:[0-9]+]], [[R2]], [[R3]]
+; CHECK-DAG: cmpwi [[R1]], 1
+; CHECK-DAG: srad 4, 4, 5
+; CHECK: isel 3, [[R5]], [[R4]], 0
+; CHECK: blr
+define i128 @ashr(i128 %x, i128 %y) {
   %r = ashr i128 %x, %y
   ret i128 %r
 }
-define i128 @foo_shl(i128 %x, i128 %y) {
+; CHECK-LABEL: shl:
+; CHECK-DAG: subfic [[R0:[0-9]+]], 5, 64
+; CHECK-DAG: addi [[R1:[0-9]+]], 5, -64
+; CHECK-DAG: sld [[R2:[0-9]+]], 4, 5
+; CHECK-DAG: srd [[R3:[0-9]+]], 3, [[R0]]
+; CHECK-DAG: sld [[R4:[0-9]+]], 3, [[R1]]
+; CHECK-DAG: or [[R5:[0-9]+]], [[R2]], [[R3]]
+; CHECK-DAG: or 4, [[R5]], [[R4]]
+; CHECK-DAG: sld 3, 3, 5
+; CHECK: blr
+define i128 @shl(i128 %x, i128 %y) {
   %r = shl i128 %x, %y
   ret i128 %r
 }
+
+; CHECK-LABEL: shl_v1i128:
+; P8-NOT: {{\b}}vslo
+; P8-NOT: {{\b}}vsl
+; P9-DAG: vslo
+; P9-DAG: vspltb
+; P9: vsl
+; P9-NOT: {{\b}}sld
+; P9-NOT: {{\b}}srd
+; CHECK: blr
+define i128 @shl_v1i128(i128 %arg, i128 %amt) local_unnamed_addr #0 {
+entry:
+  %0 = insertelement <1 x i128> undef, i128 %arg, i32 0
+  %1 = insertelement <1 x i128> undef, i128 %amt, i32 0
+  %2 = shl <1 x i128> %0, %1
+  %retval = extractelement <1 x i128> %2, i32 0
+  ret i128 %retval
+}
+
+; CHECK-LABEL: lshr_v1i128:
+; P8-NOT: {{\b}}vsro
+; P8-NOT: {{\b}}vsr
+; P9-DAG: vsro
+; P9-DAG: vspltb
+; P9: vsr
+; P9-NOT: {{\b}}srd
+; P9-NOT: {{\b}}sld
+; CHECK: blr
+define i128 @lshr_v1i128(i128 %arg, i128 %amt) local_unnamed_addr #0 {
+entry:
+  %0 = insertelement <1 x i128> undef, i128 %arg, i32 0
+  %1 = insertelement <1 x i128> undef, i128 %amt, i32 0
+  %2 = lshr <1 x i128> %0, %1
+  %retval = extractelement <1 x i128> %2, i32 0
+  ret i128 %retval
+}
+
+; Arithmetic shift right is not available as an operation on the vector registers.
+; CHECK-LABEL: ashr_v1i128:
+; CHECK-NOT: {{\b}}vsro
+; CHECK-NOT: {{\b}}vsr
+; CHECK: blr
+define i128 @ashr_v1i128(i128 %arg, i128 %amt) local_unnamed_addr #0 {
+entry:
+  %0 = insertelement <1 x i128> undef, i128 %arg, i32 0
+  %1 = insertelement <1 x i128> undef, i128 %amt, i32 0
+  %2 = ashr <1 x i128> %0, %1
+  %retval = extractelement <1 x i128> %2, i32 0
+  ret i128 %retval
+}