[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
diff --git a/llvm/test/CodeGen/SystemZ/int-cmp-22.ll b/llvm/test/CodeGen/SystemZ/int-cmp-22.ll
index f29023c..4737265 100644
--- a/llvm/test/CodeGen/SystemZ/int-cmp-22.ll
+++ b/llvm/test/CodeGen/SystemZ/int-cmp-22.ll
@@ -6,7 +6,7 @@
define double @f1(double %a, double %b, i16 *%ptr) {
; CHECK-LABEL: f1:
; CHECK: chhsi 0(%r2), 0
-; CHECK-NEXT: jl
+; CHECK-NEXT: blr %r14
; CHECK: ldr %f0, %f2
; CHECK: br %r14
%val = load i16 , i16 *%ptr
@@ -19,7 +19,7 @@
define double @f2(double %a, double %b, i16 *%ptr) {
; CHECK-LABEL: f2:
; CHECK: chhsi 0(%r2), 0
-; CHECK-NEXT: jle
+; CHECK-NEXT: bler %r14
; CHECK: ldr %f0, %f2
; CHECK: br %r14
%val = load i16 , i16 *%ptr
@@ -32,7 +32,7 @@
define double @f3(double %a, double %b, i16 *%ptr) {
; CHECK-LABEL: f3:
; CHECK: chhsi 0(%r2), 32766
-; CHECK-NEXT: jl
+; CHECK-NEXT: blr %r14
; CHECK: ldr %f0, %f2
; CHECK: br %r14
%val = load i16 , i16 *%ptr
@@ -45,7 +45,7 @@
define double @f4(double %a, double %b, i16 *%ptr) {
; CHECK-LABEL: f4:
; CHECK: chhsi 0(%r2), -1
-; CHECK-NEXT: jl
+; CHECK-NEXT: blr %r14
; CHECK: ldr %f0, %f2
; CHECK: br %r14
%val = load i16 , i16 *%ptr
@@ -58,7 +58,7 @@
define double @f5(double %a, double %b, i16 *%ptr) {
; CHECK-LABEL: f5:
; CHECK: chhsi 0(%r2), -32766
-; CHECK-NEXT: jl
+; CHECK-NEXT: blr %r14
; CHECK: ldr %f0, %f2
; CHECK: br %r14
%val = load i16 , i16 *%ptr
@@ -71,7 +71,7 @@
define double @f6(double %a, double %b, i16 %i1, i16 *%base) {
; CHECK-LABEL: f6:
; CHECK: chhsi 4094(%r3), 0
-; CHECK-NEXT: jl
+; CHECK-NEXT: blr %r14
; CHECK: ldr %f0, %f2
; CHECK: br %r14
%ptr = getelementptr i16, i16 *%base, i64 2047
@@ -86,7 +86,7 @@
; CHECK-LABEL: f7:
; CHECK: aghi %r2, 4096
; CHECK: chhsi 0(%r2), 0
-; CHECK-NEXT: jl
+; CHECK-NEXT: blr %r14
; CHECK: ldr %f0, %f2
; CHECK: br %r14
%ptr = getelementptr i16, i16 *%base, i64 2048
@@ -101,7 +101,7 @@
; CHECK-LABEL: f8:
; CHECK: aghi %r2, -2
; CHECK: chhsi 0(%r2), 0
-; CHECK-NEXT: jl
+; CHECK-NEXT: blr %r14
; CHECK: ldr %f0, %f2
; CHECK: br %r14
%ptr = getelementptr i16, i16 *%base, i64 -1
@@ -116,7 +116,7 @@
; CHECK-LABEL: f9:
; CHECK: agr {{%r2, %r3|%r3, %r2}}
; CHECK: chhsi 0({{%r[23]}}), 0
-; CHECK-NEXT: jl
+; CHECK-NEXT: blr %r14
; CHECK: ldr %f0, %f2
; CHECK: br %r14
%add = add i64 %base, %index