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[Hexagon] Improve generated code for test-if-bit-clear 

llvm-svn: 369947
This commit is contained in:
Krzysztof Parzyszek 2019-08-26 19:08:08 +00:00
parent 2cd7fafc11
commit 9e0feaf562
3 changed files with 35 additions and 22 deletions
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2
llvm/lib/Target/Hexagon/HexagonGenExtract.cpp
View File

@ -184,7 +184,7 @@ bool HexagonGenExtract::convert(Instruction *In) {
// The width of the extracted field is the minimum of the original bits
// that remain after the shifts and the number of contiguous 1s in the mask.
uint32_t W = std::min(U, T);
if (W == 0)
if (W == 0 || W == 1)
return false;
// Check if the extracted bits are contained within the mask that it is

22
llvm/lib/Target/Hexagon/HexagonPatterns.td
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@ -162,6 +162,11 @@ def IsNPow2_64H: PatLeaf<(i64 imm), [{
return isPowerOf2_64(NV) && Log2_64(NV) >= 32;
}]>;
class IsULE<int Width, int Arg>: PatLeaf<(i32 imm),
"uint64_t V = N->getZExtValue();" #
"return isUInt<" # Width # ">(V) && V <= " # Arg # ";"
>;
class IsUGT<int Width, int Arg>: PatLeaf<(i32 imm),
"uint64_t V = N->getZExtValue();" #
"return isUInt<" # Width # ">(V) && V > " # Arg # ";"
@ -1739,6 +1744,7 @@ let AddedComplexity = 20 in { // Complexity greater than and/or/xor
(i32 (LoReg $Rss)))>;
}
let AddedComplexity = 20 in { // Complexity greater than cmp reg-imm.
def: Pat<(i1 (setne (and (shl 1, u5_0ImmPred:$u5), I32:$Rs), 0)),
(S2_tstbit_i IntRegs:$Rs, imm:$u5)>;
@ -1750,6 +1756,22 @@ let AddedComplexity = 20 in { // Complexity greater than cmp reg-imm.
(S2_tstbit_i (LoReg DoubleRegs:$Rs), 0)>;
}
def: Pat<(and (srl I32:$Rs, u5_0ImmPred:$u5), 1),
(I1toI32 (S2_tstbit_i I32:$Rs, imm:$u5))>;
def: Pat<(and (srl I64:$Rss, IsULE<32,31>:$u6), 1),
(ToZext64 (I1toI32 (S2_tstbit_i (LoReg $Rss), imm:$u6)))>;
def: Pat<(and (srl I64:$Rss, IsUGT<32,31>:$u6), 1),
(ToZext64 (I1toI32 (S2_tstbit_i (HiReg $Rss), (UDEC32 $u6))))>;
def N1toI32: OutPatFrag<(ops node:$Pu), (C2_muxii (i1 $Pu), 0, 1)>;
def: Pat<(and (not (srl I32:$Rs, u5_0ImmPred:$u5)), 1),
(N1toI32 (S2_tstbit_i I32:$Rs, imm:$u5))>;
def: Pat<(and (not (srl I64:$Rss, IsULE<32,31>:$u6)), 1),
(ToZext64 (N1toI32 (S2_tstbit_i (LoReg $Rss), imm:$u6)))>;
def: Pat<(and (not (srl I64:$Rss, IsUGT<32,31>:$u6)), 1),
(ToZext64 (N1toI32 (S2_tstbit_i (HiReg $Rss), (UDEC32 $u6))))>;
let AddedComplexity = 20 in { // Complexity greater than compare reg-imm.
def: Pat<(i1 (seteq (and I32:$Rs, u6_0ImmPred:$u6), 0)),
(C2_bitsclri IntRegs:$Rs, imm:$u6)>;

33
llvm/test/CodeGen/Hexagon/tstbit.ll
View File

@ -24,11 +24,11 @@ define i64 @is_upper_bit_clear_i64(i64 %x) #0 {
; CHECK-LABEL: is_upper_bit_clear_i64:
; CHECK: // %bb.0:
; CHECK-NEXT: {
; CHECK-NEXT: r1:0 = extractu(r1:0,#1,#37)
; CHECK-NEXT: p0 = tstbit(r1,#5)
; CHECK-NEXT: r1 = #0
; CHECK-NEXT: }
; CHECK-NEXT: {
; CHECK-NEXT: r0 = togglebit(r0,#0)
; CHECK-NEXT: r1 = #0
; CHECK-NEXT: r0 = mux(p0,#0,#1)
; CHECK-NEXT: jumpr r31
; CHECK-NEXT: }
%sh = lshr i64 %x, 37
@ -41,11 +41,11 @@ define i64 @is_lower_bit_clear_i64(i64 %x) #0 {
; CHECK-LABEL: is_lower_bit_clear_i64:
; CHECK: // %bb.0:
; CHECK-NEXT: {
; CHECK-NEXT: r1:0 = extractu(r1:0,#1,#27)
; CHECK-NEXT: p0 = tstbit(r0,#27)
; CHECK-NEXT: r1 = #0
; CHECK-NEXT: }
; CHECK-NEXT: {
; CHECK-NEXT: r0 = togglebit(r0,#0)
; CHECK-NEXT: r1 = #0
; CHECK-NEXT: r0 = mux(p0,#0,#1)
; CHECK-NEXT: jumpr r31
; CHECK-NEXT: }
%sh = lshr i64 %x, 27
@ -58,13 +58,10 @@ define i32 @is_bit_clear_i32(i32 %x) #0 {
; CHECK-LABEL: is_bit_clear_i32:
; CHECK: // %bb.0:
; CHECK-NEXT: {
; CHECK-NEXT: r1 = #-1
; CHECK-NEXT: p0 = tstbit(r0,#27)
; CHECK-NEXT: }
; CHECK-NEXT: {
; CHECK-NEXT: r1 ^= lsr(r0,#27)
; CHECK-NEXT: }
; CHECK-NEXT: {
; CHECK-NEXT: r0 = and(r1,#1)
; CHECK-NEXT: r0 = mux(p0,#0,#1)
; CHECK-NEXT: jumpr r31
; CHECK-NEXT: }
%sh = lshr i32 %x, 27
@ -77,13 +74,10 @@ define i16 @is_bit_clear_i16(i16 %x) #0 {
; CHECK-LABEL: is_bit_clear_i16:
; CHECK: // %bb.0:
; CHECK-NEXT: {
; CHECK-NEXT: r1 = #-1
; CHECK-NEXT: p0 = tstbit(r0,#7)
; CHECK-NEXT: }
; CHECK-NEXT: {
; CHECK-NEXT: r1 ^= lsr(r0,#7)
; CHECK-NEXT: }
; CHECK-NEXT: {
; CHECK-NEXT: r0 = and(r1,#1)
; CHECK-NEXT: r0 = mux(p0,#0,#1)
; CHECK-NEXT: jumpr r31
; CHECK-NEXT: }
%sh = lshr i16 %x, 7
@ -96,13 +90,10 @@ define i8 @is_bit_clear_i8(i8 %x) #0 {
; CHECK-LABEL: is_bit_clear_i8:
; CHECK: // %bb.0:
; CHECK-NEXT: {
; CHECK-NEXT: r1 = #-1
; CHECK-NEXT: p0 = tstbit(r0,#3)
; CHECK-NEXT: }
; CHECK-NEXT: {
; CHECK-NEXT: r1 ^= lsr(r0,#3)
; CHECK-NEXT: }
; CHECK-NEXT: {
; CHECK-NEXT: r0 = and(r1,#1)
; CHECK-NEXT: r0 = mux(p0,#0,#1)
; CHECK-NEXT: jumpr r31
; CHECK-NEXT: }
%sh = lshr i8 %x, 3