Model the carry bit on ppc32. Without this we could

move a SUBFC (etc.) below the SUBFE (etc.) that consumed
the carry bit.  Add missing ADDIC8, noticed along the way.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@82266 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 62 insertions, 0 deletions

diff --git a/test/CodeGen/PowerPC/2009-09-18-carrybit.ll b/test/CodeGen/PowerPC/2009-09-18-carrybit.ll
new file mode 100644
index 0000000..6c23a61
--- /dev/null
+++ b/test/CodeGen/PowerPC/2009-09-18-carrybit.ll
@@ -0,0 +1,62 @@
+; RUN: llc -march=ppc32 < %s | FileCheck %s
+; ModuleID = '<stdin>'
+target datalayout = "E-p:32:32:32-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:32:64-f32:32:32-f64:32:64-v64:64:64-v128:128:128-a0:0:64-f128:64:128"
+target triple = "powerpc-apple-darwin9.6"
+
+define i64 @foo(i64 %r.0.ph, i64 %q.0.ph, i32 %sr1.1.ph) nounwind {
+entry:
+; CHECK: foo:
+; CHECK: subfc
+; CHECK: subfe
+; CHECK: subfc
+; CHECK: subfe
+  %tmp0 = add i64 %r.0.ph, -1                           ; <i64> [#uses=1]
+  br label %bb40
+
+bb40:                                             ; preds = %bb40, %entry
+  %indvar = phi i32 [ 0, %entry ], [ %indvar.next, %bb40 ] ; <i32> [#uses=1]
+  %carry.0274 = phi i32 [ 0, %entry ], [%tmp122, %bb40 ] ; <i32> [#uses=1]
+  %r.0273 = phi i64 [ %r.0.ph, %entry ], [ %tmp124, %bb40 ] ; <i64> [#uses=2]
+  %q.0272 = phi i64 [ %q.0.ph, %entry ], [ %ins169, %bb40 ] ; <i64> [#uses=3]
+  %tmp1 = lshr i64 %r.0273, 31                     ; <i64> [#uses=1]
+  %tmp2 = trunc i64 %tmp1 to i32                    ; <i32> [#uses=1]
+  %tmp3 = and i32 %tmp2, -2                         ; <i32> [#uses=1]
+  %tmp213 = trunc i64 %r.0273 to i32              ; <i32> [#uses=2]
+  %tmp106 = lshr i32 %tmp213, 31                     ; <i32> [#uses=1]
+  %tmp107 = or i32 %tmp3, %tmp106                        ; <i32> [#uses=1]
+  %tmp215 = zext i32 %tmp107 to i64                  ; <i64> [#uses=1]
+  %tmp216 = shl i64 %tmp215, 32                   ; <i64> [#uses=1]
+  %tmp108 = shl i32 %tmp213, 1                       ; <i32> [#uses=1]
+  %tmp109 = lshr i64 %q.0272, 63                     ; <i64> [#uses=1]
+  %tmp110 = trunc i64 %tmp109 to i32                    ; <i32> [#uses=1]
+  %tmp111 = or i32 %tmp108, %tmp110                        ; <i32> [#uses=1]
+  %tmp222 = zext i32 %tmp111 to i64                  ; <i64> [#uses=1]
+  %ins224 = or i64 %tmp216, %tmp222               ; <i64> [#uses=2]
+  %tmp112 = lshr i64 %q.0272, 31                     ; <i64> [#uses=1]
+  %tmp113 = trunc i64 %tmp112 to i32                    ; <i32> [#uses=1]
+  %tmp114 = and i32 %tmp113, -2                         ; <i32> [#uses=1]
+  %tmp158 = trunc i64 %q.0272 to i32              ; <i32> [#uses=2]
+  %tmp115 = lshr i32 %tmp158, 31                     ; <i32> [#uses=1]
+  %tmp116 = or i32 %tmp114, %tmp115                        ; <i32> [#uses=1]
+  %tmp160 = zext i32 %tmp116 to i64                  ; <i64> [#uses=1]
+  %tmp161 = shl i64 %tmp160, 32                   ; <i64> [#uses=1]
+  %tmp117 = shl i32 %tmp158, 1                       ; <i32> [#uses=1]
+  %tmp118 = or i32 %tmp117, %carry.0274                 ; <i32> [#uses=1]
+  %tmp167 = zext i32 %tmp118 to i64                  ; <i64> [#uses=1]
+  %ins169 = or i64 %tmp161, %tmp167               ; <i64> [#uses=2]
+  %tmp119 = sub i64 %tmp0, %ins224                    ; <i64> [#uses=1]
+  %tmp120 = ashr i64 %tmp119, 63                        ; <i64> [#uses=2]
+  %tmp121 = trunc i64 %tmp120 to i32                    ; <i32> [#uses=1]
+  %tmp122 = and i32 %tmp121, 1                          ; <i32> [#uses=2]
+  %tmp123 = and i64 %tmp120, %q.0.ph                         ; <i64> [#uses=1]
+  %tmp124 = sub i64 %ins224, %tmp123                    ; <i64> [#uses=2]
+  %indvar.next = add i32 %indvar, 1               ; <i32> [#uses=2]
+  %exitcond = icmp eq i32 %indvar.next, %sr1.1.ph ; <i1> [#uses=1]
+  br i1 %exitcond, label %bb41.bb42_crit_edge, label %bb40
+
+bb41.bb42_crit_edge:                              ; preds = %bb40
+  %phitmp278 = zext i32 %tmp122 to i64               ; <i64> [#uses=1]
+  %tmp125 = shl i64 %ins169, 1                    ; <i64> [#uses=1]
+  %tmp126 = or i64 %phitmp278, %tmp125              ; <i64> [#uses=2]
+  ret i64 %tmp126
+}