Implement PPCInstrInfo::FoldImmediate
There are certain PPC instructions into which we can fold a zero immediate
operand. We can detect such cases by looking at the register class required
by the using operand (so long as it is not otherwise constrained).
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@178961 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/test/CodeGen/PowerPC/fold-zero.ll b/test/CodeGen/PowerPC/fold-zero.ll
new file mode 100644
index 0000000..c7ec6fa
--- /dev/null
+++ b/test/CodeGen/PowerPC/fold-zero.ll
@@ -0,0 +1,14 @@
+; RUN: llc < %s -mtriple=powerpc64-unknown-linux-gnu -mcpu=pwr7 | FileCheck %s
+target datalayout = "E-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-f128:128:128-v128:128:128-n32:64"
+target triple = "powerpc64-unknown-linux-gnu"
+
+define i32 @test1(i1 %a, i32 %c) nounwind {
+ %x = select i1 %a, i32 %c, i32 0
+ ret i32 %x
+
+; CHECK: @test1
+; CHECK-NOT: li {{[0-9]+}}, 0
+; CHECK: isel 3, 0,
+; CHECK: blr
+}
+