gvn/gcm review

- Many stylistic nits.
- Removed blkmerge().
- Some minor bug fixes.
- GCM reassoc is now "sink"; a pass that
  moves trivial ops in their target block
  with the same goal of reducing register
  pressure, but starting from instructions
  that benefit from having their inputs
  close.

3 files changed, 15 insertions, 0 deletions

diff --git a/test/copy.ssa b/test/copy.ssa
new file mode 100644
index 0000000..5c2a4d0
--- /dev/null
+++ b/test/copy.ssa
@@ -0,0 +1,15 @@
+export function w $f() {
+@start
+	%x0 =w loadsb $a
+	# the extension must not be eliminated
+	# even though the load already extended
+	%x1 =l extsb %x0
+	%c =w ceql %x1, -1
+	ret %c
+}
+
+# >>> driver
+# char a = -1;
+# extern int f();
+# int main() { return !(f() == 1); }
+# <<<
diff --git a/test/gvn-live-dead.ssa b/test/gvn1.ssa
index d47f05b..d47f05b 100644
--- a/test/gvn-live-dead.ssa
+++ b/test/gvn1.ssa
diff --git a/test/non0jnz.ssa b/test/gvn2.ssa
index 33f9a96..33f9a96 100644
--- a/test/non0jnz.ssa
+++ b/test/gvn2.ssa