[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-20.ll b/llvm/test/CodeGen/SystemZ/int-cmp-20.ll
index 2acff55af59..55f7efc08a1 100644
--- a/llvm/test/CodeGen/SystemZ/int-cmp-20.ll
+++ b/llvm/test/CodeGen/SystemZ/int-cmp-20.ll
@@ -8,7 +8,7 @@
 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
   %ext = zext i8 %val to i32
@@ -22,7 +22,7 @@ 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), 1
-; CHECK-NEXT: jh
+; CHECK-NEXT: bhr %r14
 ; CHECK: br %r14
   %val = load i8 , i8 *%ptr
   %ext = sext i8 %val to i32
@@ -36,7 +36,7 @@ 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), 254
-; CHECK-NEXT: jl
+; CHECK-NEXT: blr %r14
 ; CHECK: br %r14
   %val = load i8 , i8 *%ptr
   %ext = zext i8 %val to i32
@@ -50,7 +50,7 @@ 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), 254
-; CHECK-NEXT: jl
+; CHECK-NEXT: blr %r14
 ; CHECK: br %r14
   %val = load i8 , i8 *%ptr
   %ext = sext i8 %val to i32
@@ -105,7 +105,7 @@ 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), 1
-; CHECK-NEXT: jh
+; CHECK-NEXT: bhr %r14
 ; CHECK: br %r14
   %val = load i8 , i8 *%ptr
   %ext = zext i8 %val to i32
@@ -132,7 +132,7 @@ 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), 254
-; CHECK-NEXT: jl
+; CHECK-NEXT: blr %r14
 ; CHECK: br %r14
   %val = load i8 , i8 *%ptr
   %ext = zext i8 %val to i32
@@ -171,7 +171,7 @@ define double @f12(double %a, double %b, i8 *%ptr) {
 define double @f13(double %a, double %b, i8 *%ptr) {
 ; CHECK-LABEL: f13:
 ; CHECK: cli 0(%r2), 128
-; CHECK-NEXT: jl
+; CHECK-NEXT: blr %r14
 ; CHECK: br %r14
   %val = load i8 , i8 *%ptr
   %ext = sext i8 %val to i32
@@ -184,7 +184,7 @@ define double @f13(double %a, double %b, i8 *%ptr) {
 define double @f14(double %a, double %b, i8 *%ptr) {
 ; CHECK-LABEL: f14:
 ; CHECK: cli 0(%r2), 128
-; CHECK-NEXT: jl
+; CHECK-NEXT: blr %r14
 ; CHECK: br %r14
   %val = load i8 , i8 *%ptr
   %ext = sext i8 %val to i32
@@ -197,7 +197,7 @@ define double @f14(double %a, double %b, i8 *%ptr) {
 define double @f15(double %a, double %b, i8 *%ptr) {
 ; CHECK-LABEL: f15:
 ; CHECK: cli 0(%r2), 127
-; CHECK-NEXT: jh
+; CHECK-NEXT: bhr %r14
 ; CHECK: br %r14
   %val = load i8 , i8 *%ptr
   %ext = sext i8 %val to i32
@@ -210,7 +210,7 @@ define double @f15(double %a, double %b, i8 *%ptr) {
 define double @f16(double %a, double %b, i8 *%ptr) {
 ; CHECK-LABEL: f16:
 ; CHECK: cli 0(%r2), 127
-; CHECK-NEXT: jh
+; CHECK-NEXT: bhr %r14
 ; CHECK: br %r14
   %val = load i8 , i8 *%ptr
   %ext = sext i8 %val to i32