https://github.com/dyung updated https://github.com/llvm/llvm-project/pull/161937
>From 6e687cbe0dd3a6fc89cdd007dca6e4f5578fccff Mon Sep 17 00:00:00 2001 From: Koakuma <[email protected]> Date: Fri, 3 Oct 2025 19:25:08 +0700 Subject: [PATCH] [SPARC] Prevent meta instructions from being inserted into delay slots (#161111) Do not move meta instructions like `FAKE_USE`/`@llvm.fake.use` into delay slots, as they don't correspond to real machine instructions. This should fix crashes when compiling with, for example, `clang -Og`. (cherry picked from commit 2e1fab93467ec8c37a236ae6e059300ebaa0c986) --- llvm/lib/Target/Sparc/DelaySlotFiller.cpp | 4 +-- .../CodeGen/SPARC/2011-01-19-DelaySlot.ll | 25 +++++++++++++++++++ 2 files changed, 27 insertions(+), 2 deletions(-) diff --git a/llvm/lib/Target/Sparc/DelaySlotFiller.cpp b/llvm/lib/Target/Sparc/DelaySlotFiller.cpp index 6c19049a001cf..024030d196ee3 100644 --- a/llvm/lib/Target/Sparc/DelaySlotFiller.cpp +++ b/llvm/lib/Target/Sparc/DelaySlotFiller.cpp @@ -206,8 +206,8 @@ Filler::findDelayInstr(MachineBasicBlock &MBB, if (!done) --I; - // skip debug instruction - if (I->isDebugInstr()) + // Skip meta instructions. + if (I->isMetaInstruction()) continue; if (I->hasUnmodeledSideEffects() || I->isInlineAsm() || I->isPosition() || diff --git a/llvm/test/CodeGen/SPARC/2011-01-19-DelaySlot.ll b/llvm/test/CodeGen/SPARC/2011-01-19-DelaySlot.ll index 9ccd4f1c0ac9a..767ef7eb510e6 100644 --- a/llvm/test/CodeGen/SPARC/2011-01-19-DelaySlot.ll +++ b/llvm/test/CodeGen/SPARC/2011-01-19-DelaySlot.ll @@ -184,4 +184,29 @@ entry: ret i32 %2 } +define i32 @test_generic_inst(i32 %arg) #0 { +;CHECK-LABEL: test_generic_inst: +;CHECK: ! fake_use: {{.*}} +;CHECK: bne {{.*}} +;CHECK-NEXT: nop + %bar1 = call i32 @bar(i32 %arg) + %even = and i32 %bar1, 1 + %cmp = icmp eq i32 %even, 0 + ; This shouldn't get reordered into a delay slot + call void (...) @llvm.fake.use(i32 %arg) + br i1 %cmp, label %true, label %false +true: + %bar2 = call i32 @bar(i32 %bar1) + br label %cont + +false: + %inc = add nsw i32 %bar1, 1 + br label %cont + +cont: + %ret = phi i32 [ %bar2, %true ], [ %inc, %false ] + ret i32 %ret +} + +declare void @llvm.fake.use(...) attributes #0 = { nounwind "disable-tail-calls"="true" } _______________________________________________ llvm-branch-commits mailing list [email protected] https://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-branch-commits
