Changes in directory llvm/lib/Target/ARM:
README-Thumb.txt updated: 1.4 -> 1.5
---
Log message:
Add a note.
---
Diffs of the changes: (+61 -0)
README-Thumb.txt | 61 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
1 files changed, 61 insertions(+)
Index: llvm/lib/Target/ARM/README-Thumb.txt
diff -u llvm/lib/Target/ARM/README-Thumb.txt:1.4
llvm/lib/Target/ARM/README-Thumb.txt:1.5
--- llvm/lib/Target/ARM/README-Thumb.txt:1.4 Wed Jan 31 19:07:48 2007
+++ llvm/lib/Target/ARM/README-Thumb.txt Wed Jan 31 20:46:20 2007
@@ -63,3 +63,64 @@
ldr r0, LCPI1_0
=>
ldr r0, pc, #((LCPI1_0-(LPCRELL0+4))&0xfffffffc)
+
+
+//===---------------------------------------------------------------------===//
+
+We compiles the following using a jump table.
+
+define i16 @func_entry_2E_ce(i32 %i) {
+newFuncRoot:
+ br label %entry.ce
+
+bb12.exitStub: ; preds = %entry.ce
+ ret i16 0
+
+bb4.exitStub: ; preds = %entry.ce, %entry.ce, %entry.ce
+ ret i16 1
+
+bb9.exitStub: ; preds = %entry.ce, %entry.ce, %entry.ce
+ ret i16 2
+
+bb.exitStub: ; preds = %entry.ce
+ ret i16 3
+
+entry.ce: ; preds = %newFuncRoot
+ switch i32 %i, label %bb12.exitStub [
+ i32 0, label %bb4.exitStub
+ i32 1, label %bb9.exitStub
+ i32 2, label %bb4.exitStub
+ i32 3, label %bb4.exitStub
+ i32 7, label %bb9.exitStub
+ i32 8, label %bb.exitStub
+ i32 9, label %bb9.exitStub
+ ]
+}
+
+gcc compiles to:
+
+ cmp r0, #9
+ @ lr needed for prologue
+ bhi L2
+ ldr r3, L11
+ mov r2, #1
+ mov r1, r2, asl r0
+ ands r0, r3, r2, asl r0
+ movne r0, #2
+ bxne lr
+ tst r1, #13
+ beq L9
+L3:
+ mov r0, r2
+ bx lr
+L9:
+ tst r1, #256
+ movne r0, #3
+ bxne lr
+L2:
+ mov r0, #0
+ bx lr
+L12:
+ .align 2
+L11:
+ .long 642
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