Fix r194019 as requested by Eric Christopher.

Submit the basic port of the rest of ARM constant islands code to Mips. 
Two test cases are added which reflect the next level of functionality:
constants getting moved to water areas that are out of range from the
initial placement at the end of the function and basic blocks being split to
create water when none exists that can be used. There is a bunch of this
code that is not complete and has been marked with IN_PROGRESS. I will
finish cleaning this all up during the next week or two and submit the
rest of the test cases. I have elminated some code for dealing with
inline assembly because to me it unecessarily complicates things and
some of the newer features of llvm like function attributies and builtin
assembler give me better tools to solve the alignment issues created
there. Also, for Mips16 I even have the option of not doing constant
islands in the present of inline assembler if I chose. When everything
has been completed I will summarize the port and notify people that
are knowledgable regarding the ARM Constant Islands code so they can
review it in it's entirety if they wish.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@194053 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 64 insertions, 0 deletions

diff --git a/test/CodeGen/Mips/const4.ll b/test/CodeGen/Mips/const4.ll
new file mode 100644
index 0000000000..04da731859
--- /dev/null
+++ b/test/CodeGen/Mips/const4.ll
@@ -0,0 +1,64 @@
+; RUN: llc -mtriple=mipsel-linux-gnu -march=mipsel -mcpu=mips16 -soft-float -mips16-hard-float -relocation-model=static -mips16-constant-islands -mips-constant-islands-small-offset=20  < %s | FileCheck %s -check-prefix=offset20
+
+; RUN: llc -mtriple=mipsel-linux-gnu -march=mipsel -mcpu=mips16 -soft-float -mips16-hard-float -relocation-model=static -mips16-constant-islands -mips-constant-islands-small-offset=40  < %s | FileCheck %s -check-prefix=offset40
+
+
+@i = common global i32 0, align 4
+@b = common global i32 0, align 4
+
+; Function Attrs: nounwind
+define void @t() #0 {
+entry:
+  store i32 -559023410, i32* @i, align 4
+  %0 = load i32* @b, align 4
+  %tobool = icmp ne i32 %0, 0
+  br i1 %tobool, label %if.then, label %if.else
+; offset20: lw	${{[0-9]+}}, $CPI0_1	# 16 bit inst
+; offset20:	b	$BB0_2
+; offset20:	.align	2
+; offset20: $CPI0_0:
+; offset20:	.4byte	3735943886
+; offset20: $BB0_2: 
+
+; offset40:	beqz	${{[0-9]+}}, $BB0_3
+; offset40:	jal	foo
+; offset40:	nop
+; offset40:	b	$BB0_4
+; offset40:	.align	2
+; offset40: $CPI0_0:
+; offset40:	.4byte	3735943886
+; offset40: $BB0_3:
+; offset40:	jal	goo
+
+if.then:                                          ; preds = %entry
+  call void bitcast (void (...)* @foo to void ()*)()
+  br label %if.end
+
+if.else:                                          ; preds = %entry
+  call void bitcast (void (...)* @goo to void ()*)()
+  br label %if.end
+
+if.end:                                           ; preds = %if.else, %if.then
+  call void bitcast (void (...)* @hoo to void ()*)()
+  call void bitcast (void (...)* @hoo to void ()*)()
+  call void bitcast (void (...)* @hoo to void ()*)()
+  call void bitcast (void (...)* @hoo to void ()*)()
+  call void bitcast (void (...)* @hoo to void ()*)()
+  call void bitcast (void (...)* @hoo to void ()*)()
+  call void bitcast (void (...)* @hoo to void ()*)()
+  call void bitcast (void (...)* @hoo to void ()*)()
+  ret void
+}
+
+declare void @foo(...) #1
+
+declare void @goo(...) #1
+
+declare void @hoo(...) #1
+
+attributes #0 = { nounwind "less-precise-fpmad"="false" "no-frame-pointer-elim"="true" "no-frame-pointer-elim-non-leaf" "no-infs-fp-math"="false" "no-nans-fp-math"="false" "stack-protector-buffer-size"="8" "unsafe-fp-math"="false" "use-soft-float"="true" }
+attributes #1 = { "less-precise-fpmad"="false" "no-frame-pointer-elim"="true" "no-frame-pointer-elim-non-leaf" "no-infs-fp-math"="false" "no-nans-fp-math"="false" "stack-protector-buffer-size"="8" "unsafe-fp-math"="false" "use-soft-float"="true" }
+
+!llvm.ident = !{!0}
+
+!0 = metadata !{metadata !"clang version 3.4 (gitosis@dmz-portal.mips.com:clang.git 3a50d847e098f36e3bf8bc14eea07a6cc35f7803) (gitosis@dmz-portal.mips.com:llvm.git f52db0b69f0c888bdc98bb2f13aaecc1e83288a9)"}