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Generalize a pattern for PKHTB: an SRL of 16-31 bits will guarantee

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that the high halfword is zero.  The shift need not be exactly 16 bits.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@111196 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Bob Wilson 2010-08-16 22:26:55 +00:00
parent b05b80160a
commit dc66edaced
4 changed files with 27 additions and 5 deletions
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6
lib/Target/ARM/ARMInstrInfo.td
View File

@ -2257,6 +2257,8 @@ def : ARMV6Pat<(or (and GPR:$src1, 0xFFFF), (shl GPR:$src2, imm16_31:$shamt)),
(PKHBT GPR:$src1, GPR:$src2, imm16_31:$shamt)>;
// Note: Shifts of 1-15 bits will be transformed to srl instead of sra and
// will match the pattern below.
def PKHTB : AMiscA1I<0b01101000, (outs GPR:$dst),
(ins GPR:$src1, GPR:$src2, i32imm:$shamt),
IIC_iALUsi, "pkhtb", "\t$dst, $src1, $src2, asr $shamt",
@ -2268,8 +2270,8 @@ def PKHTB : AMiscA1I<0b01101000, (outs GPR:$dst),
// Alternate cases for PKHTB where identities eliminate some nodes. Note that
// a shift amount of 0 is *not legal* here, it is PKHBT instead.
def : ARMV6Pat<(or (and GPR:$src1, 0xFFFF0000), (srl GPR:$src2, (i32 16))),
(PKHTB GPR:$src1, GPR:$src2, 16)>;
def : ARMV6Pat<(or (and GPR:$src1, 0xFFFF0000), (srl GPR:$src2, imm16_31:$sh)),
(PKHTB GPR:$src1, GPR:$src2, imm16_31:$sh)>;
def : ARMV6Pat<(or (and GPR:$src1, 0xFFFF0000),
(and (srl GPR:$src2, imm1_15:$shamt), 0xFFFF)),
(PKHTB GPR:$src1, GPR:$src2, imm1_15:$shamt)>;

6
lib/Target/ARM/ARMInstrThumb2.td
View File

@ -2106,6 +2106,8 @@ def : T2Pat<(or (and rGPR:$src1, 0xFFFF), (shl rGPR:$src2, imm16_31:$shamt)),
(t2PKHBT rGPR:$src1, rGPR:$src2, imm16_31:$shamt)>,
Requires<[HasT2ExtractPack]>;
// Note: Shifts of 1-15 bits will be transformed to srl instead of sra and
// will match the pattern below.
def t2PKHTB : T2I<(outs rGPR:$dst), (ins rGPR:$src1, rGPR:$src2, i32imm:$shamt),
IIC_iALUsi, "pkhtb", "\t$dst, $src1, $src2, asr $shamt",
[(set rGPR:$dst, (or (and rGPR:$src1, 0xFFFF0000),
@ -2121,8 +2123,8 @@ def t2PKHTB : T2I<(outs rGPR:$dst), (ins rGPR:$src1, rGPR:$src2, i32imm:$shamt),
// Alternate cases for PKHTB where identities eliminate some nodes. Note that
// a shift amount of 0 is *not legal* here, it is PKHBT instead.
def : T2Pat<(or (and rGPR:$src1, 0xFFFF0000), (srl rGPR:$src2, (i32 16))),
(t2PKHTB rGPR:$src1, rGPR:$src2, 16)>,
def : T2Pat<(or (and rGPR:$src1, 0xFFFF0000), (srl rGPR:$src2, imm16_31:$sh)),
(t2PKHTB rGPR:$src1, rGPR:$src2, imm16_31:$sh)>,
Requires<[HasT2ExtractPack]>;
def : T2Pat<(or (and rGPR:$src1, 0xFFFF0000),
(and (srl rGPR:$src2, imm1_15:$shamt), 0xFFFF)),

11
test/CodeGen/ARM/pack.ll
View File

@ -38,7 +38,7 @@ define i32 @test3(i32 %X, i32 %Y) {
}
; CHECK: test4
; CHECK: pkhbt r0, r0, r1
; CHECK: pkhbt r0, r0, r1, lsl #0
define i32 @test4(i32 %X, i32 %Y) {
%tmp1 = and i32 %X, 65535 ; <i32> [#uses=1]
%tmp3 = and i32 %Y, -65536 ; <i32> [#uses=1]
@ -86,3 +86,12 @@ define i32 @test7(i32 %X, i32 %Y) {
%tmp57 = or i32 %tmp4, %tmp1 ; <i32> [#uses=1]
ret i32 %tmp57
}
; CHECK: test8
; CHECK: pkhtb r0, r0, r1, asr #22
define i32 @test8(i32 %X, i32 %Y) {
%tmp1 = and i32 %X, -65536
%tmp3 = lshr i32 %Y, 22
%tmp57 = or i32 %tmp3, %tmp1
ret i32 %tmp57
}

9
test/CodeGen/Thumb2/thumb2-pack.ll
View File

@ -86,3 +86,12 @@ define i32 @test7(i32 %X, i32 %Y) {
%tmp57 = or i32 %tmp4, %tmp1 ; <i32> [#uses=1]
ret i32 %tmp57
}
; CHECK: test8
; CHECK: pkhtb r0, r0, r1, asr #22
define i32 @test8(i32 %X, i32 %Y) {
%tmp1 = and i32 %X, -65536
%tmp3 = lshr i32 %Y, 22
%tmp57 = or i32 %tmp3, %tmp1
ret i32 %tmp57
}