Allow machine-cse to look across MBB boundary when cse'ing instructions that
define physical registers. It's currently very restrictive, only catching
cases where the CE is in an immediate (and only) predecessor. But it catches
a surprising large number of cases.
rdar://10660865
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@147827 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/test/CodeGen/ARM/machine-cse-cmp.ll b/test/CodeGen/ARM/machine-cse-cmp.ll
index c77402f..f566974 100644
--- a/test/CodeGen/ARM/machine-cse-cmp.ll
+++ b/test/CodeGen/ARM/machine-cse-cmp.ll
@@ -1,4 +1,4 @@
-; RUN: llc < %s -march=arm | FileCheck %s
+; RUN: llc < %s -mtriple=armv7-apple-ios | FileCheck %s
;rdar://8003725
@G1 = external global i32
@@ -6,6 +6,7 @@
define i32 @f1(i32 %cond1, i32 %x1, i32 %x2, i32 %x3) {
entry:
+; CHECK: f1:
; CHECK: cmp
; CHECK: moveq
; CHECK-NOT: cmp
@@ -16,3 +17,31 @@
%tmp4 = add i32 %tmp2, %tmp3
ret i32 %tmp4
}
+
+@foo = external global i32
+@bar = external global [250 x i8], align 1
+
+; CSE of cmp across BB boundary
+; rdar://10660865
+define void @f2() nounwind ssp {
+entry:
+; CHECK: f2:
+; CHECK: cmp
+; CHECK: poplt
+; CHECK-NOT: cmp
+; CHECK: movle
+ %0 = load i32* @foo, align 4
+ %cmp28 = icmp sgt i32 %0, 0
+ br i1 %cmp28, label %for.body.lr.ph, label %for.cond1.preheader
+
+for.body.lr.ph: ; preds = %entry
+ %1 = icmp sgt i32 %0, 1
+ %smax = select i1 %1, i32 %0, i32 1
+ call void @llvm.memset.p0i8.i32(i8* getelementptr inbounds ([250 x i8]* @bar, i32 0, i32 0), i8 0, i32 %smax, i32 1, i1 false)
+ unreachable
+
+for.cond1.preheader: ; preds = %entry
+ ret void
+}
+
+declare void @llvm.memset.p0i8.i32(i8* nocapture, i8, i32, i32, i1) nounwind
diff --git a/test/CodeGen/Thumb2/thumb2-cbnz.ll b/test/CodeGen/Thumb2/thumb2-cbnz.ll
index 7993bbf..893bd0f 100644
--- a/test/CodeGen/Thumb2/thumb2-cbnz.ll
+++ b/test/CodeGen/Thumb2/thumb2-cbnz.ll
@@ -24,7 +24,6 @@
bb9: ; preds = %bb7
; CHECK: cmp r0, #0
-; CHECK: cmp r0, #0
; CHECK-NEXT: cbnz
%0 = tail call double @foo(double %b) nounwind readnone ; <double> [#uses=0]
br label %bb11
diff --git a/test/CodeGen/X86/machine-cse.ll b/test/CodeGen/X86/machine-cse.ll
index d819fc8..a757cde 100644
--- a/test/CodeGen/X86/machine-cse.ll
+++ b/test/CodeGen/X86/machine-cse.ll
@@ -1,4 +1,4 @@
-; RUN: llc -mtriple=x86_64-apple-darwin < %s | FileCheck %s
+; RUN: llc -mtriple=x86_64-apple-macosx < %s | FileCheck %s
; rdar://7610418
%ptr = type { i8* }
@@ -77,3 +77,25 @@
sw.bb307: ; preds = %sw.bb, %entry
ret void
}
+
+; CSE physical register defining instruction across MBB boundary.
+; rdar://10660865
+define i32 @cross_mbb_phys_cse(i32 %a, i32 %b) nounwind ssp {
+entry:
+; CHECK: cross_mbb_phys_cse:
+; CHECK: cmpl
+; CHECK: ja
+ %cmp = icmp ugt i32 %a, %b
+ br i1 %cmp, label %return, label %if.end
+
+if.end: ; preds = %entry
+; CHECK-NOT: cmpl
+; CHECK: sbbl
+ %cmp1 = icmp ult i32 %a, %b
+ %. = sext i1 %cmp1 to i32
+ br label %return
+
+return: ; preds = %if.end, %entry
+ %retval.0 = phi i32 [ 1, %entry ], [ %., %if.end ]
+ ret i32 %retval.0
+}