Add support for using MVN to materialize negative constants.

rdar://10412592

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@144348 91177308-0d34-0410-b5e6-96231b3b80d8

2 files changed, 113 insertions, 6 deletions

diff --git a/test/CodeGen/ARM/fast-isel-ldrh-strh-arm.ll b/test/CodeGen/ARM/fast-isel-ldrh-strh-arm.ll
index 6bc19da40b..62c6e0ce4d 100644
--- a/test/CodeGen/ARM/fast-isel-ldrh-strh-arm.ll
+++ b/test/CodeGen/ARM/fast-isel-ldrh-strh-arm.ll
@@ -11,7 +11,7 @@ entry:
 ; ARM: t1
   %add.ptr = getelementptr inbounds i16* %a, i64 -8
   %0 = load i16* %add.ptr, align 2
-; ARM: ldr r{{[1-9]}}, LCPI0_0
+; ARM: mvn r{{[1-9]}}, #15
 ; ARM: add r0, r0, r{{[1-9]}}
 ; ARM: ldrh r0, [r0]
   ret i16 %0
@@ -23,7 +23,7 @@ entry:
 ; ARM: t2
   %add.ptr = getelementptr inbounds i16* %a, i64 -16
   %0 = load i16* %add.ptr, align 2
-; ARM: ldr r{{[1-9]}}, LCPI1_0
+; ARM: mvn r{{[1-9]}}, #31
 ; ARM: add r0, r0, r{{[1-9]}}
 ; ARM: ldrh r0, [r0]
   ret i16 %0
@@ -35,7 +35,7 @@ entry:
 ; ARM: t3
   %add.ptr = getelementptr inbounds i16* %a, i64 -127
   %0 = load i16* %add.ptr, align 2
-; ARM: ldr r{{[1-9]}}, LCPI2_0
+; ARM: mvn r{{[1-9]}}, #253
 ; ARM: add r0, r0, r{{[1-9]}}
 ; ARM: ldrh r0, [r0]
   ret i16 %0
@@ -48,7 +48,7 @@ entry:
 ; ARM: t4
   %add.ptr = getelementptr inbounds i16* %a, i64 -128
   %0 = load i16* %add.ptr, align 2
-; ARM: ldr r{{[1-9]}}, LCPI3_0
+; ARM: mvn r{{[1-9]}}, #255
 ; ARM: add r0, r0, r{{[1-9]}}
 ; ARM: ldrh r0, [r0]
   ret i16 %0
@@ -97,7 +97,7 @@ entry:
 ; ARM: t9
   %add.ptr = getelementptr inbounds i16* %a, i64 -8
   store i16 0, i16* %add.ptr, align 2
-; ARM: ldr r{{[1-9]}}, LCPI8_0
+; ARM: mvn r{{[1-9]}}, #15
 ; ARM: add r0, r0, r{{[1-9]}}
 ; ARM: strh r{{[1-9]}}, [r0]
   ret void
@@ -110,7 +110,7 @@ entry:
 ; ARM: t10
   %add.ptr = getelementptr inbounds i16* %a, i64 -128
   store i16 0, i16* %add.ptr, align 2
-; ARM: ldr r{{[1-9]}}, LCPI9_0
+; ARM: mvn r{{[1-9]}}, #255
 ; ARM: add r0, r0, r{{[1-9]}}
 ; ARM: strh r{{[1-9]}}, [r0]
   ret void
diff --git a/test/CodeGen/ARM/fast-isel-mvn.ll b/test/CodeGen/ARM/fast-isel-mvn.ll
new file mode 100644
index 0000000000..daf56e7ae1
--- /dev/null
+++ b/test/CodeGen/ARM/fast-isel-mvn.ll
@@ -0,0 +1,107 @@
+; RUN: llc < %s -O0 -fast-isel-abort -relocation-model=dynamic-no-pic -mtriple=armv7-apple-darwin | FileCheck %s --check-prefix=ARM
+; RUN: llc < %s -O0 -fast-isel-abort -relocation-model=dynamic-no-pic -mtriple=thumbv7-apple-darwin | FileCheck %s --check-prefix=THUMB
+; rdar://10412592
+
+; Note: The Thumb code is being generated by the target-independent selector.
+
+define void @t1() nounwind {
+entry:
+; ARM: t1
+; THUMB: t1
+; ARM: mvn r0, #0
+; THUMB: movw r0, #65535
+; THUMB: movt r0, #65535
+  call void @foo(i32 -1)
+  ret void
+}
+
+declare void @foo(i32)
+
+define void @t2() nounwind {
+entry:
+; ARM: t2
+; THUMB: t2
+; ARM: mvn r0, #233
+; THUMB: movw r0, #65302
+; THUMB: movt r0, #65535
+  call void @foo(i32 -234)
+  ret void
+}
+
+define void @t3() nounwind {
+entry:
+; ARM: t3
+; THUMB: t3
+; ARM: mvn	r0, #256
+; THUMB: movw r0, #65279
+; THUMB: movt r0, #65535
+  call void @foo(i32 -257)
+  ret void
+}
+
+; Load from constant pool
+define void @t4() nounwind {
+entry:
+; ARM: t4
+; THUMB: t4
+; ARM: ldr	r0
+; THUMB: movw r0, #65278
+; THUMB: movt r0, #65535
+  call void @foo(i32 -258)
+  ret void
+}
+
+define void @t5() nounwind {
+entry:
+; ARM: t5
+; THUMB: t5
+; ARM: mvn r0, #65280
+; THUMB: movs r0, #255
+; THUMB: movt r0, #65535
+  call void @foo(i32 -65281)
+  ret void
+}
+
+define void @t6() nounwind {
+entry:
+; ARM: t6
+; THUMB: t6
+; ARM: mvn r0, #978944
+; THUMB: movw r0, #4095
+; THUMB: movt r0, #65521
+  call void @foo(i32 -978945)
+  ret void
+}
+
+define void @t7() nounwind {
+entry:
+; ARM: t7
+; THUMB: t7
+; ARM: mvn r0, #267386880
+; THUMB: movw r0, #65535
+; THUMB: movt r0, #61455
+  call void @foo(i32 -267386881)
+  ret void
+}
+
+define void @t8() nounwind {
+entry:
+; ARM: t8
+; THUMB: t8
+; ARM: mvn r0, #65280
+; THUMB: movs r0, #255
+; THUMB: movt r0, #65535
+  call void @foo(i32 -65281)
+  ret void
+}
+
+define void @t9() nounwind {
+entry:
+; ARM: t9
+; THUMB: t9
+; ARM: mvn r0, #2130706432
+; THUMB: movw r0, #65535
+; THUMB: movt r0, #33023
+  call void @foo(i32 -2130706433)
+  ret void
+}
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