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authorDimitry Andric <dim@FreeBSD.org>2023-04-14 21:41:27 +0000
committerDimitry Andric <dim@FreeBSD.org>2023-06-22 18:20:56 +0000
commitbdd1243df58e60e85101c09001d9812a789b6bc4 (patch)
treea1ce621c7301dd47ba2ddc3b8eaa63b441389481 /contrib/llvm-project/llvm/lib/CodeGen/TargetRegisterInfo.cpp
parent781624ca2d054430052c828ba8d2c2eaf2d733e7 (diff)
parente3b557809604d036af6e00c60f012c2025b59a5e (diff)
Diffstat (limited to 'contrib/llvm-project/llvm/lib/CodeGen/TargetRegisterInfo.cpp')
-rw-r--r--contrib/llvm-project/llvm/lib/CodeGen/TargetRegisterInfo.cpp14
1 files changed, 9 insertions, 5 deletions
diff --git a/contrib/llvm-project/llvm/lib/CodeGen/TargetRegisterInfo.cpp b/contrib/llvm-project/llvm/lib/CodeGen/TargetRegisterInfo.cpp
index ac346585b0f8..a41d5999d961 100644
--- a/contrib/llvm-project/llvm/lib/CodeGen/TargetRegisterInfo.cpp
+++ b/contrib/llvm-project/llvm/lib/CodeGen/TargetRegisterInfo.cpp
@@ -115,7 +115,7 @@ Printable printReg(Register Reg, const TargetRegisterInfo *TRI,
OS << "$noreg";
else if (Register::isStackSlot(Reg))
OS << "SS#" << Register::stackSlot2Index(Reg);
- else if (Register::isVirtualRegister(Reg)) {
+ else if (Reg.isVirtual()) {
StringRef Name = MRI ? MRI->getVRegName(Reg) : "";
if (Name != "") {
OS << '%' << Name;
@@ -571,10 +571,14 @@ bool TargetRegisterInfo::getCoveringSubRegIndexes(
break;
}
- // Try to cover as much of the remaining lanes as possible but
- // as few of the already covered lanes as possible.
- int Cover = (SubRegMask & LanesLeft).getNumLanes() -
- (SubRegMask & ~LanesLeft).getNumLanes();
+ // Do not cover already-covered lanes to avoid creating cycles
+ // in copy bundles (= bundle contains copies that write to the
+ // registers).
+ if ((SubRegMask & ~LanesLeft).any())
+ continue;
+
+ // Try to cover as many of the remaining lanes as possible.
+ const int Cover = (SubRegMask & LanesLeft).getNumLanes();
if (Cover > BestCover) {
BestCover = Cover;
BestIdx = Idx;