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1c646a78c0
Summary: Also fixup rL371928 for cases that occur on our out-of-tree backend There were still quite a few intermediate APInts and this caused the compile time of MCCodeEmitter for our target to jump from 16s up to ~5m40s. This patch, brings it back down to ~17s by eliminating pretty much all of them using two new APInt functions (extractBitsAsZExtValue(), insertBits() but with a uint64_t). The exact conditions for eliminating them is that the field extracted/inserted must be <=64-bit which is almost always true. Note: The two new APInt API's assume that APInt::WordSize is at least 64-bit because that means they touch at most 2 APInt words. They statically assert that's true. It seems very unlikely that someone is patching it to be smaller so this should be fine. Reviewers: jmolloy Reviewed By: jmolloy Subscribers: hiraditya, dexonsmith, llvm-commits Tags: #llvm Differential Revision: https://reviews.llvm.org/D67686 llvm-svn: 372243
58 lines
1.5 KiB
TableGen
58 lines
1.5 KiB
TableGen
// RUN: llvm-tblgen -gen-emitter -I %p/../../include %s | FileCheck %s
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include "llvm/Target/Target.td"
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def archInstrInfo : InstrInfo { }
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def arch : Target {
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let InstructionSet = archInstrInfo;
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}
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def Myi32 : Operand<i32> {
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let DecoderMethod = "DecodeMyi32";
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}
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let OutOperandList = (outs), Size = 2 in {
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def foo : Instruction {
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let InOperandList = (ins i32imm:$factor);
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field bits<65> Inst;
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bits<32> factor;
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let Inst{7-0} = 0xAA;
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let Inst{14-8} = factor{6-0}; // no offset
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let AsmString = "foo $factor";
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field bits<16> SoftFail = 0;
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}
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def bar : Instruction {
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let InOperandList = (ins i32imm:$factor);
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field bits<65> Inst;
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bits<32> factor;
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let Inst{7-0} = 0xBB;
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let Inst{15-8} = factor{10-3}; // offset by 3
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let AsmString = "bar $factor";
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field bits<16> SoftFail = 0;
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}
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def biz : Instruction {
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let InOperandList = (ins i32imm:$factor);
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field bits<65> Inst;
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bits<32> factor;
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let Inst{7-0} = 0xCC;
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let Inst{11-8,15-12} = factor{10-3}; // offset by 3, multipart
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let AsmString = "biz $factor";
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field bits<16> SoftFail = 0;
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}
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}
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// CHECK-LABEL: case ::biz: {
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// CHECK: Value.insertBits(op.extractBitsAsZExtValue(4, 3), 12, 4);
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// CHECK-NEXT: Value.insertBits(op.extractBitsAsZExtValue(4, 7), 8, 4);
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// CHECK-LABEL: case ::foo: {
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// CHECK: Value.insertBits(op.extractBitsAsZExtValue(7, 0), 8, 7);
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// CHECK-LABEL: case ::bar: {
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// CHECK: Value.insertBits(op.extractBitsAsZExtValue(8, 3), 8, 8);
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