[SystemZ] Implement conditional returns

Return is now considered a predicable instruction, and is converted
to a newly-added CondReturn (which maps to BCR to %r14) instruction by
the if conversion pass.

Also, fused compare-and-branch transform knows about conditional
returns, emitting the proper fused instructions for them.

This transform triggers on a *lot* of tests, hence the huge diffstat.
The changes are mostly jX to br %r14 -> bXr %r14.

Author: koriakin

Differential Revision: http://reviews.llvm.org/D17339

llvm-svn: 265689

1 files changed, 4 insertions, 4 deletions

diff --git a/llvm/test/CodeGen/SystemZ/int-cmp-24.ll b/llvm/test/CodeGen/SystemZ/int-cmp-24.ll
index e1141a78ddd..d7bfeb270f3 100644
--- a/llvm/test/CodeGen/SystemZ/int-cmp-24.ll
+++ b/llvm/test/CodeGen/SystemZ/int-cmp-24.ll
@@ -6,7 +6,7 @@
 define double @f1(double %a, double %b, i16 *%ptr) {
 ; CHECK-LABEL: f1:
 ; CHECK: clhhsi 0(%r2), 0
-; CHECK-NEXT: je
+; CHECK-NEXT: ber %r14
 ; CHECK: ldr %f0, %f2
 ; CHECK: br %r14
   %val = load i16 , i16 *%ptr
@@ -19,7 +19,7 @@ define double @f1(double %a, double %b, i16 *%ptr) {
 define double @f2(double %a, double %b, i16 *%ptr) {
 ; CHECK-LABEL: f2:
 ; CHECK: clhhsi 0(%r2), 65535
-; CHECK-NEXT: je
+; CHECK-NEXT: ber %r14
 ; CHECK: ldr %f0, %f2
 ; CHECK: br %r14
   %val = load i16 , i16 *%ptr
@@ -32,7 +32,7 @@ define double @f2(double %a, double %b, i16 *%ptr) {
 define double @f3(double %a, double %b, i16 *%ptr) {
 ; CHECK-LABEL: f3:
 ; CHECK: clhhsi 0(%r2), 32768
-; CHECK-NEXT: je
+; CHECK-NEXT: ber %r14
 ; CHECK: ldr %f0, %f2
 ; CHECK: br %r14
   %val = load i16 , i16 *%ptr
@@ -45,7 +45,7 @@ define double @f3(double %a, double %b, i16 *%ptr) {
 define double @f4(double %a, double %b, i16 *%ptr) {
 ; CHECK-LABEL: f4:
 ; CHECK: clhhsi 0(%r2), 32767
-; CHECK-NEXT: je
+; CHECK-NEXT: ber %r14
 ; CHECK: ldr %f0, %f2
 ; CHECK: br %r14
   %val = load i16 , i16 *%ptr