[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/fp-sqrt-01.ll b/llvm/test/CodeGen/SystemZ/fp-sqrt-01.ll
index e8bf65b..3680207 100644
--- a/llvm/test/CodeGen/SystemZ/fp-sqrt-01.ll
+++ b/llvm/test/CodeGen/SystemZ/fp-sqrt-01.ll
@@ -159,9 +159,7 @@
; CHECK-LABEL: f8:
; CHECK: sqebr %f0, %f2
; CHECK: cebr %f0, %f0
-; CHECK: jo [[LABEL:\.L.*]]
-; CHECK: br %r14
-; CHECK: [[LABEL]]:
+; CHECK: bnor %r14
; CHECK: ler %f0, %f2
; CHECK: jg sqrtf@PLT
%res = tail call float @sqrtf(float %val)