From 06ae1d2c00a9af483c4e3fcf8117dfb7c290f175 Mon Sep 17 00:00:00 2001
From: Tom Stellard <thomas.stellard@amd.com>
Date: Wed, 9 Apr 2014 15:40:10 +0000
Subject: Merging r205630:

------------------------------------------------------------------------
r205630 | hfinkel | 2014-04-04 11:15:57 -0400 (Fri, 04 Apr 2014) | 6 lines

[PowerPC] Add a full condition code register to make the "cc" clobber work

gcc inline asm supports specifying "cc" as a clobber of all condition
registers. Add just enough modeling of the full register to make this work.
Fixed PR19326.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/branches/release_34@205908 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/Target/PowerPC/PPCRegisterInfo.td | 12 ++++++
 test/CodeGen/PowerPC/cc.ll            | 70 +++++++++++++++++++++++++++++++++++
 2 files changed, 82 insertions(+)
 create mode 100644 test/CodeGen/PowerPC/cc.ll

diff --git a/lib/Target/PowerPC/PPCRegisterInfo.td b/lib/Target/PowerPC/PPCRegisterInfo.td
index d566e2c3e5..43663ce013 100644
--- a/lib/Target/PowerPC/PPCRegisterInfo.td
+++ b/lib/Target/PowerPC/PPCRegisterInfo.td
@@ -144,6 +144,13 @@ def CR6 : CR<6, "cr6", [CR6LT, CR6GT, CR6EQ, CR6UN]>, DwarfRegNum<[74, 74]>;
 def CR7 : CR<7, "cr7", [CR7LT, CR7GT, CR7EQ, CR7UN]>, DwarfRegNum<[75, 75]>;
 }
 
+// The full condition-code register. This is not modeled fully, but defined
+// here primarily, for compatibility with gcc, to allow the inline asm "cc"
+// clobber specification to work.
+def CC : PPCReg<"cc">, DwarfRegAlias<CR0> {
+  let Aliases = [CR0, CR1, CR2, CR3, CR4, CR5, CR6, CR7];
+}
+
 // Link register
 def LR  : SPR<8, "lr">, DwarfRegNum<[-2, 65]>;
 //let Aliases = [LR] in
@@ -234,3 +241,8 @@ def VRSAVERC : RegisterClass<"PPC", [i32], 32, (add VRSAVE)>;
 def CARRYRC : RegisterClass<"PPC", [i32], 32, (add CARRY)> {
   let CopyCost = -1;
 }
+
+def CCRC : RegisterClass<"PPC", [i32], 32, (add CC)> {
+  let isAllocatable = 0;
+}
+
diff --git a/test/CodeGen/PowerPC/cc.ll b/test/CodeGen/PowerPC/cc.ll
new file mode 100644
index 0000000000..ab724f5a7e
--- /dev/null
+++ b/test/CodeGen/PowerPC/cc.ll
@@ -0,0 +1,70 @@
+; RUN: llc -mcpu=pwr7 < %s | FileCheck %s
+target datalayout = "E-m:e-i64:64-n32:64"
+target triple = "powerpc64-unknown-linux-gnu"
+
+define i64 @test1(i64 %a, i64 %b) {
+entry:
+  %c = icmp eq i64 %a, %b
+  br label %foo
+
+foo:
+  call { i64, i64 } asm sideeffect "sc", "={r0},={r3},{r0},~{cr0},~{cr1},~{cr2},~{cr3},~{cr4},~{cr5},~{cr6},~{cr7}" (i64 %a)
+  br i1 %c, label %bar, label %end
+
+bar:
+  ret i64 %b
+
+end:
+  ret i64 %a
+
+; CHECK-LABEL: @test1
+; CHECK: mfcr [[REG1:[0-9]+]]
+; CHECK-DAG: cmpld
+; CHECK-DAG: mfocrf [[REG2:[0-9]+]],
+; CHECK-DAG: stw [[REG1]], 8(1)
+; CHECK-DAG: stw [[REG2]], -4(1)
+
+; CHECK: sc
+; CHECK: lwz [[REG3:[0-9]+]], -4(1)
+; CHECK: mtocrf 128, [[REG3]]
+
+; CHECK: lwz [[REG4:[0-9]+]], 8(1)
+; CHECK-DAG: mtocrf 32, [[REG4]]
+; CHECK-DAG: mtocrf 16, [[REG4]]
+; CHECK-DAG: mtocrf 8, [[REG4]]
+; CHECK: blr
+}
+
+define i64 @test2(i64 %a, i64 %b) {
+entry:
+  %c = icmp eq i64 %a, %b
+  br label %foo
+
+foo:
+  call { i64, i64 } asm sideeffect "sc", "={r0},={r3},{r0},~{cc}" (i64 %a)
+  br i1 %c, label %bar, label %end
+
+bar:
+  ret i64 %b
+
+end:
+  ret i64 %a
+
+; CHECK-LABEL: @test2
+; CHECK: mfcr [[REG1:[0-9]+]]
+; CHECK-DAG: cmpld
+; CHECK-DAG: mfocrf [[REG2:[0-9]+]],
+; CHECK-DAG: stw [[REG1]], 8(1)
+; CHECK-DAG: stw [[REG2]], -4(1)
+
+; CHECK: sc
+; CHECK: lwz [[REG3:[0-9]+]], -4(1)
+; CHECK: mtocrf 128, [[REG3]]
+
+; CHECK: lwz [[REG4:[0-9]+]], 8(1)
+; CHECK-DAG: mtocrf 32, [[REG4]]
+; CHECK-DAG: mtocrf 16, [[REG4]]
+; CHECK-DAG: mtocrf 8, [[REG4]]
+; CHECK: blr
+}
+
-- 
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