[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, 10 insertions, 10 deletions

diff --git a/llvm/test/CodeGen/SystemZ/int-cmp-15.ll b/llvm/test/CodeGen/SystemZ/int-cmp-15.ll
index 3c1e052bc35..a8a391b62cf 100644
--- a/llvm/test/CodeGen/SystemZ/int-cmp-15.ll
+++ b/llvm/test/CodeGen/SystemZ/int-cmp-15.ll
@@ -6,7 +6,7 @@
 define double @f1(double %a, double %b, i8 *%ptr) {
 ; CHECK-LABEL: f1:
 ; CHECK: cli 0(%r2), 1
-; CHECK-NEXT: jh
+; CHECK-NEXT: bhr %r14
 ; CHECK: br %r14
   %val = load i8 , i8 *%ptr
   %cond = icmp ugt i8 %val, 1
@@ -18,7 +18,7 @@ define double @f1(double %a, double %b, i8 *%ptr) {
 define double @f2(double %a, double %b, i8 *%ptr) {
 ; CHECK-LABEL: f2:
 ; CHECK: cli 0(%r2), 254
-; CHECK-NEXT: jl
+; CHECK-NEXT: blr %r14
 ; CHECK: br %r14
   %val = load i8 , i8 *%ptr
   %cond = icmp ult i8 %val, 254
@@ -30,7 +30,7 @@ define double @f2(double %a, double %b, i8 *%ptr) {
 define double @f3(double %a, double %b, i8 *%ptr) {
 ; CHECK-LABEL: f3:
 ; CHECK: cli 0(%r2), 127
-; CHECK-NEXT: jh
+; CHECK-NEXT: bhr %r14
 ; CHECK: br %r14
   %val = load i8 , i8 *%ptr
   %cond = icmp slt i8 %val, 0
@@ -42,7 +42,7 @@ define double @f3(double %a, double %b, i8 *%ptr) {
 define double @f4(double %a, double %b, i8 *%ptr) {
 ; CHECK-LABEL: f4:
 ; CHECK: cli 0(%r2), 127
-; CHECK-NEXT: jh
+; CHECK-NEXT: bhr %r14
 ; CHECK: br %r14
   %val = load i8 , i8 *%ptr
   %cond = icmp sle i8 %val, -1
@@ -54,7 +54,7 @@ define double @f4(double %a, double %b, i8 *%ptr) {
 define double @f5(double %a, double %b, i8 *%ptr) {
 ; CHECK-LABEL: f5:
 ; CHECK: cli 0(%r2), 128
-; CHECK-NEXT: jl
+; CHECK-NEXT: blr %r14
 ; CHECK: br %r14
   %val = load i8 , i8 *%ptr
   %cond = icmp sge i8 %val, 0
@@ -66,7 +66,7 @@ define double @f5(double %a, double %b, i8 *%ptr) {
 define double @f6(double %a, double %b, i8 *%ptr) {
 ; CHECK-LABEL: f6:
 ; CHECK: cli 0(%r2), 128
-; CHECK-NEXT: jl
+; CHECK-NEXT: blr %r14
 ; CHECK: br %r14
   %val = load i8 , i8 *%ptr
   %cond = icmp sgt i8 %val, -1
@@ -78,7 +78,7 @@ define double @f6(double %a, double %b, i8 *%ptr) {
 define double @f7(double %a, double %b, i8 *%ptr) {
 ; CHECK-LABEL: f7:
 ; CHECK: cli 0(%r2), 128
-; CHECK-NEXT: je
+; CHECK-NEXT: ber %r14
 ; CHECK: br %r14
   %val = load i8 , i8 *%ptr
   %cond = icmp eq i8 %val, -128
@@ -90,7 +90,7 @@ define double @f7(double %a, double %b, i8 *%ptr) {
 define double @f8(double %a, double %b, i8 *%ptr) {
 ; CHECK-LABEL: f8:
 ; CHECK: cli 0(%r2), 0
-; CHECK-NEXT: je
+; CHECK-NEXT: ber %r14
 ; CHECK: br %r14
   %val = load i8 , i8 *%ptr
   %cond = icmp eq i8 %val, 0
@@ -102,7 +102,7 @@ define double @f8(double %a, double %b, i8 *%ptr) {
 define double @f9(double %a, double %b, i8 *%ptr) {
 ; CHECK-LABEL: f9:
 ; CHECK: cli 0(%r2), 127
-; CHECK-NEXT: je
+; CHECK-NEXT: ber %r14
 ; CHECK: br %r14
   %val = load i8 , i8 *%ptr
   %cond = icmp eq i8 %val, 127
@@ -114,7 +114,7 @@ define double @f9(double %a, double %b, i8 *%ptr) {
 define double @f10(double %a, double %b, i8 *%ptr) {
 ; CHECK-LABEL: f10:
 ; CHECK: cli 0(%r2), 255
-; CHECK-NEXT: je
+; CHECK-NEXT: ber %r14
 ; CHECK: br %r14
   %val = load i8 , i8 *%ptr
   %cond = icmp eq i8 %val, 255