Fix a really nasty SROA bug with how we handled out-of-bounds memcpy

[oota-llvm.git] / test / CodeGen / SystemZ / branch-06.ll

diff --git a/test/CodeGen/SystemZ/branch-06.ll b/test/CodeGen/SystemZ/branch-06.ll
index 13e5a843f1394cdd12333035d36fd603e81289a5..2fa23b744afb350da208722030708a55cf355c8e 100644 (file)
--- a/test/CodeGen/SystemZ/branch-06.ll
+++ b/test/CodeGen/SystemZ/branch-06.ll
@@ -3,6 +3,7 @@
 ; RUN: llc < %s -mtriple=s390x-linux-gnu | FileCheck %s
 
 declare i32 @foo()
+@g1 = global i16 0
 
 define void @f1(i32 %target) {
 ; CHECK-LABEL: f1:
@@ -87,3 +88,103 @@ loop:
 exit:
   ret void
 }
+
+; Check that CRJ is used for checking equality with a zero-extending
+; character load.
+define void @f7(i8 *%targetptr) {
+; CHECK-LABEL: f7:
+; CHECK: .cfi_def_cfa_offset
+; CHECK: .L[[LABEL:.*]]:
+; CHECK: llc [[REG:%r[0-5]]],
+; CHECK: crje %r2, [[REG]], .L[[LABEL]]
+  br label %loop
+loop:
+  %val = call i32 @foo()
+  %byte = load i8 *%targetptr
+  %target = zext i8 %byte to i32
+  %cond = icmp eq i32 %val, %target
+  br i1 %cond, label %loop, label %exit
+exit:
+  ret void
+}
+
+; ...and zero-extending i16 loads.
+define void @f8(i16 *%targetptr) {
+; CHECK-LABEL: f8:
+; CHECK: .cfi_def_cfa_offset
+; CHECK: .L[[LABEL:.*]]:
+; CHECK: llh [[REG:%r[0-5]]],
+; CHECK: crje %r2, [[REG]], .L[[LABEL]]
+  br label %loop
+loop:
+  %val = call i32 @foo()
+  %half = load i16 *%targetptr
+  %target = zext i16 %half to i32
+  %cond = icmp eq i32 %val, %target
+  br i1 %cond, label %loop, label %exit
+exit:
+  ret void
+}
+
+; ...unless the address is a global.
+define void @f9(i16 *%targetptr) {
+; CHECK-LABEL: f9:
+; CHECK: .cfi_def_cfa_offset
+; CHECK: .L[[LABEL:.*]]:
+; CHECK: clhrl %r2, g1
+; CHECK: je .L[[LABEL]]
+  br label %loop
+loop:
+  %val = call i32 @foo()
+  %half = load i16 *@g1
+  %target = zext i16 %half to i32
+  %cond = icmp eq i32 %val, %target
+  br i1 %cond, label %loop, label %exit
+exit:
+  ret void
+}
+
+; Check that CRJ is used for checking order between two zero-extending
+; byte loads, even if the original comparison was unsigned.
+define void @f10(i8 *%targetptr1) {
+; CHECK-LABEL: f10:
+; CHECK: .cfi_def_cfa_offset
+; CHECK: .L[[LABEL:.*]]:
+; CHECK-DAG: llc [[REG1:%r[0-5]]], 0(
+; CHECK-DAG: llc [[REG2:%r[0-5]]], 1(
+; CHECK: crjl [[REG1]], [[REG2]], .L[[LABEL]]
+  br label %loop
+loop:
+  %val = call i32 @foo()
+  %targetptr2 = getelementptr i8 *%targetptr1, i64 1
+  %byte1 = load i8 *%targetptr1
+  %byte2 = load i8 *%targetptr2
+  %ext1 = zext i8 %byte1 to i32
+  %ext2 = zext i8 %byte2 to i32
+  %cond = icmp ult i32 %ext1, %ext2
+  br i1 %cond, label %loop, label %exit
+exit:
+  ret void
+}
+
+; ...likewise halfword loads.
+define void @f11(i16 *%targetptr1) {
+; CHECK-LABEL: f11:
+; CHECK: .cfi_def_cfa_offset
+; CHECK: .L[[LABEL:.*]]:
+; CHECK-DAG: llh [[REG1:%r[0-5]]], 0(
+; CHECK-DAG: llh [[REG2:%r[0-5]]], 2(
+; CHECK: crjl [[REG1]], [[REG2]], .L[[LABEL]]
+  br label %loop
+loop:
+  %val = call i32 @foo()
+  %targetptr2 = getelementptr i16 *%targetptr1, i64 1
+  %half1 = load i16 *%targetptr1
+  %half2 = load i16 *%targetptr2
+  %ext1 = zext i16 %half1 to i32
+  %ext2 = zext i16 %half2 to i32
+  %cond = icmp ult i32 %ext1, %ext2
+  br i1 %cond, label %loop, label %exit
+exit:
+  ret void
+}