[PowerPC] Don't generate mfocrf on the e500mc

The e500mc does not actually support the mfocrf instruction; update the
processor definitions to reflect that fact.

Patch by Tom Rix (with some test-case cleanup by me).

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@254064 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/lib/Target/PowerPC/PPC.td b/lib/Target/PowerPC/PPC.td
index 0f990dc64f93bc94b3e46a034bdc13fc1cbc6d1a..8edff296148ba0d40caba0c25c0ec788dc606af8 100644 (file)
--- a/lib/Target/PowerPC/PPC.td
+++ b/lib/Target/PowerPC/PPC.td
@@ -312,7 +312,7 @@ def : ProcessorModel<"g5", G5Model,
                    Feature64Bit /*, Feature64BitRegs */,
                    FeatureMFTB, DeprecatedDST]>;
 def : ProcessorModel<"e500mc", PPCE500mcModel,
-                  [DirectiveE500mc, FeatureMFOCRF,
+                  [DirectiveE500mc,
                    FeatureSTFIWX, FeatureICBT, FeatureBookE, 
                    FeatureISEL, FeatureMFTB]>;
 def : ProcessorModel<"e5500", PPCE5500Model,

diff --git a/test/CodeGen/PowerPC/e500-1.ll b/test/CodeGen/PowerPC/e500-1.ll
new file mode 100644 (file)
index 0000000..7457c0e
--- /dev/null
+++ b/test/CodeGen/PowerPC/e500-1.ll
@@ -0,0 +1,30 @@
+; RUN: llc -O0 -mcpu=e500mc < %s | FileCheck %s
+; Check if e500 generates code with mfocrf insn.
+
+target datalayout = "E-m:e-p:32:32-i64:64-n32"
+target triple = "powerpc-unknown-linux-gnu"
+
+define internal i32 @func_49(i64 %p_50, i16 zeroext %p_51, i8* %p_52, i32 %p_53) {
+; CHECK-LABEL: @func_49
+; CHECK-NOT: mfocrf
+
+  %1 = load i64, i64* undef, align 8
+  %2 = load i64, i64* undef, align 8
+  %3 = icmp sge i32 undef, undef
+  %4 = zext i1 %3 to i32
+  %5 = sext i32 %4 to i64
+  %6 = icmp slt i64 %2, %5
+  %7 = zext i1 %6 to i32
+  %8 = call i64 @safe_sub_func_int64_t_s_s(i64 -6372137293439783564, i64 undef)
+  %9 = icmp slt i32 %7, undef
+  %10 = zext i1 %9 to i32
+  %11 = sext i32 %10 to i64
+  %12 = icmp sle i64 %1, %11
+  %13 = zext i1 %12 to i32
+  %14 = call i32 @safe_add_func_int32_t_s_s(i32 undef, i32 %13)
+  ret i32 undef
+}
+
+declare i32 @safe_add_func_int32_t_s_s(i32, i32)
+
+declare i64 @safe_sub_func_int64_t_s_s(i64, i64)