[SystemZ] Register compare-and-branch support
This patch adds support for the CRJ and CGRJ instructions. Support for
the immediate forms will be a separate patch.
The architecture has a large number of comparison instructions. I think
it's generally better to concentrate on using the "best" comparison
instruction first and foremost, then only use something like CRJ if
CR really was the natual choice of comparison instruction. The patch
therefore opportunistically converts separate CR and BRC instructions
into a single CRJ while emitting instructions in ISelLowering.
llvm-svn: 182764
diff --git a/llvm/test/CodeGen/SystemZ/int-cmp-14.ll b/llvm/test/CodeGen/SystemZ/int-cmp-14.ll
index e3a561e..28c325c 100644
--- a/llvm/test/CodeGen/SystemZ/int-cmp-14.ll
+++ b/llvm/test/CodeGen/SystemZ/int-cmp-14.ll
@@ -77,8 +77,7 @@
; Check the next value up, which must use a register comparison.
define double @f7(double %a, double %b, i64 %i1) {
; CHECK: f7:
-; CHECK: cgr %r2,
-; CHECK-NEXT: jlh
+; CHECK: cgrjlh %r2,
; CHECK: ldr %f0, %f2
; CHECK: br %r14
%cond = icmp ne i64 %i1, 4294967296
@@ -137,8 +136,7 @@
; Check the next value down, which must use register comparison.
define double @f12(double %a, double %b, i64 %i1) {
; CHECK: f12:
-; CHECK: cgr
-; CHECK-NEXT: jlh
+; CHECK: cgrjlh
; CHECK: ldr %f0, %f2
; CHECK: br %r14
%cond = icmp ne i64 %i1, -2147483649