[PowerPC] Fix ADDE, SUBE do not know how to promote operator

Summary:
This patch is created to fix the Bugzilla bug 39815:
https://bugs.llvm.org/show_bug.cgi?id=39815 

This patch is to support promotion integer result for the instruction ADDE, SUBE.

Reviewed By: hfinkel

Differential Revision: https://reviews.llvm.org/D56119

llvm-svn: 350161

1 files changed, 31 insertions, 0 deletions

diff --git a/llvm/test/CodeGen/PowerPC/pr39815.ll b/llvm/test/CodeGen/PowerPC/pr39815.ll
new file mode 100644
index 00000000000..a01c8be8634
--- /dev/null
+++ b/llvm/test/CodeGen/PowerPC/pr39815.ll
@@ -0,0 +1,31 @@
+; RUN: llc -mcpu=pwr9 -mtriple=powerpc64le-unknown-linux-gnu < %s \
+; RUN:   -verify-machineinstrs | FileCheck %s
+
+@b = common dso_local local_unnamed_addr global i64* null, align 8
+@a = common dso_local local_unnamed_addr global i8 0, align 1
+
+define void @testADDEPromoteResult() {
+entry:
+  %0 = load i64*, i64** @b, align 8
+  %1 = load i64, i64* %0, align 8
+  %cmp = icmp ne i64* %0, null
+  %conv1 = zext i1 %cmp to i64
+  %add = add nsw i64 %1, %conv1
+  %2 = trunc i64 %add to i8
+  %conv2 = and i8 %2, 5
+  store i8 %conv2, i8* @a, align 1
+  ret void
+
+; CHECK-LABEL: @testADDEPromoteResult
+; CHECK:      # %bb.0:
+; CHECK-DAG:   addis [[REG1:[0-9]+]], [[REG2:[0-9]+]], [[VAR1:[a-z0-9A-Z_.]+]]@toc@ha
+; CHECK-DAG:   ld [[REG3:[0-9]+]], [[VAR1]]@toc@l([[REG1]])
+; CHECK-DAG:   lbz [[REG4:[0-9]+]], 0([[REG3]])
+; CHECK-DAG:   addic [[REG5:[0-9]+]], [[REG3]], -1
+; CHECK-DAG:   extsb [[REG6:[0-9]+]], [[REG4]]
+; CHECK-DAG:   addze [[REG7:[0-9]+]], [[REG6]]
+; CHECK-DAG:   addis [[REG8:[0-9]+]], [[REG2]], [[VAR2:[a-z0-9A-Z_.]+]]@toc@ha
+; CHECK-DAG:   andi. [[REG9:[0-9]+]], [[REG7]], 5
+; CHECK-DAG:   stb [[REG9]], [[VAR2]]@toc@l([[REG8]])
+; CHECK:       blr
+}