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Currently there is a pattern for the thumb-2 MOV 16-bit immediate instruction. That instruction cannot write the flags so it should use T2I instead of T2sI.

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Also, added a pattern for the thumb-2 MOV of shifted immediate since that can encode immediates not encodable by the 16-bit immediate.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@74288 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
David Goodwin 2009-06-26 16:10:07 +00:00
parent 8947881444
commit 83b3593478
3 changed files with 49 additions and 3 deletions
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11
lib/Target/ARM/ARMInstrThumb2.td
View File

@ -409,9 +409,14 @@ def t2MOVr : T2sI<(outs GPR:$dst), (ins GPR:$src),
"mov", " $dst, $src", []>;
let isReMaterializable = 1, isAsCheapAsAMove = 1 in
def t2MOVi16 : T2sI<(outs GPR:$dst), (ins i32imm:$src),
"movw", " $dst, $src",
[(set GPR:$dst, imm0_65535:$src)]>;
def t2MOVi : T2sI<(outs GPR:$dst), (ins t2_so_imm:$src),
"mov", " $dst, $src",
[(set GPR:$dst, t2_so_imm:$src)]>;
let isReMaterializable = 1, isAsCheapAsAMove = 1 in
def t2MOVi16 : T2I<(outs GPR:$dst), (ins i32imm:$src),
"movw", " $dst, $src",
[(set GPR:$dst, imm0_65535:$src)]>;
// FIXME: Also available in ARM mode.
let Constraints = "$src = $dst" in

33
test/CodeGen/Thumb2/thumb2-mov3.ll Normal file
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@ -0,0 +1,33 @@
; RUN: llvm-as < %s | llc | grep {mov\\W*r\[0-9\],\\W*#\[0-9\]*} | grep {#171\\|#1179666\\|#872428544\\|#1448498774\\|#66846720} | Count 5
target triple = "thumbv7-apple-darwin"
; 171 = 0x000000ab
define i32 @f1(i32 %a) {
%tmp = add i32 0, 171
ret i32 %tmp
}
; 1179666 = 0x00120012
define i32 @f2(i32 %a) {
%tmp = add i32 0, 1179666
ret i32 %tmp
}
; 872428544 = 0x34003400
define i32 @f3(i32 %a) {
%tmp = add i32 0, 872428544
ret i32 %tmp
}
; 1448498774 = 0x56565656
define i32 @f4(i32 %a) {
%tmp = add i32 0, 1448498774
ret i32 %tmp
}
; 66846720 = 0x03fc0000
define i32 @f5(i32 %a) {
%tmp = add i32 0, 66846720
ret i32 %tmp
}

8
test/CodeGen/Thumb2/thumb2-mov4.ll Normal file
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@ -0,0 +1,8 @@
; RUN: llvm-as < %s | llc | grep {movw\\W*r\[0-9\],\\W*#\[0-9\]*} | grep {#65535} | Count 1
target triple = "thumbv7-apple-darwin"
define i32 @f6(i32 %a) {
%tmp = add i32 0, 65535
ret i32 %tmp
}