[PGO][PGSO] Add profile guided size optimization to LegalizeDAG.

Reviewers: davidxl

Subscribers: hiraditya, llvm-commits

Tags: #llvm

Differential Revision: https://reviews.llvm.org/D83333

Author: hjyamauchi

llvm/lib/CodeGen/SelectionDAG/LegalizeDAG.cpp

@@ -3319,7 +3319,7 @@ bool SelectionDAGLegalize::ExpandNode(SDNode *Node) {
     // Check to see if this FP immediate is already legal.
     // If this is a legal constant, turn it into a TargetConstantFP node.
     if (!TLI.isFPImmLegal(CFP->getValueAPF(), Node->getValueType(0),
-                          DAG.getMachineFunction().getFunction().hasOptSize()))
+                          DAG.shouldOptForSize()))
       Results.push_back(ExpandConstantFP(CFP, true));
     break;
   }

llvm/test/CodeGen/AArch64/arm64-fp-imm-size.ll

@@ -38,3 +38,38 @@ define fp128 @baz() optsize {
 ; CHECK-NEXT:  ret
   ret fp128 0xL00000000000000000000000000000000
 }
+
+; CHECK: literal8
+; CHECK: .quad 0x0000001fffffffd
+define double @foo2_pgso() !prof !14 {
+; CHECK: _foo2_pgso:
+; CHECK: adrp x[[REG:[0-9]+]], lCPI4_0@PAGE
+; CHECK: ldr  d0, [x[[REG]], lCPI4_0@PAGEOFF]
+; CHECK-NEXT: ret
+  ret double 0x1FFFFFFFd1
+}
+
+define float @bar_pgso() !prof !14 {
+; CHECK: _bar_pgso:
+; CHECK: adrp x[[REG:[0-9]+]], lCPI5_0@PAGE
+; CHECK: ldr  s0, [x[[REG]], lCPI5_0@PAGEOFF]
+; CHECK-NEXT:  ret
+  ret float 0x400921FB80000000
+}
+
+!llvm.module.flags = !{!0}
+!0 = !{i32 1, !"ProfileSummary", !1}
+!1 = !{!2, !3, !4, !5, !6, !7, !8, !9}
+!2 = !{!"ProfileFormat", !"InstrProf"}
+!3 = !{!"TotalCount", i64 10000}
+!4 = !{!"MaxCount", i64 10}
+!5 = !{!"MaxInternalCount", i64 1}
+!6 = !{!"MaxFunctionCount", i64 1000}
+!7 = !{!"NumCounts", i64 3}
+!8 = !{!"NumFunctions", i64 3}
+!9 = !{!"DetailedSummary", !10}
+!10 = !{!11, !12, !13}
+!11 = !{i32 10000, i64 100, i32 1}
+!12 = !{i32 999000, i64 100, i32 1}
+!13 = !{i32 999999, i64 1, i32 2}
+!14 = !{!"function_entry_count", i64 0}