6b2fd7aed6
FastISel may create a redundant BGTZ terminal which fallthroughes.
```
BGTZ %2:gpr32, %bb.1, implicit-def $at
bb.1.bb1:
; predecessors: %bb.0
```
The `!I->isBarrier()` check in
MipsAsmPrinter::isBlockOnlyReachableByFallthrough
will incorrectly not print a label, leading to a `Undefined temporary
symbol `
error when we try assembling the output assembly file. See the updated
`Fast-ISel/pr40325.ll` and
https://github.com/rust-lang/rust/issues/108835
In addition, the `SwitchInst` condition is too conservative and prints
many unneeded labels (see the updated tests).
Just use the generic isBlockOnlyReachableByFallthrough, updated by
commit 1995b9fead for SPARC, which also
handles MIPS.
25 lines
658 B
LLVM
25 lines
658 B
LLVM
; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
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; RUN: llc -mtriple=mipsel -relocation-model=pic -O0 -mcpu=mips32 < %s | FileCheck %s
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define void @test(i32 %x, ptr %p) nounwind {
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; CHECK-LABEL: test:
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; CHECK: # %bb.0:
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; CHECK-NEXT: move $1, $4
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; CHECK-NEXT: move $4, $1
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; CHECK-NEXT: andi $1, $1, 1
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; CHECK-NEXT: sb $1, 0($5)
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; CHECK-NEXT: andi $1, $4, 1
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; CHECK-NEXT: bgtz $1, $BB0_1
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; CHECK-NEXT: nop
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; CHECK-NEXT: $BB0_1: # %foo
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; CHECK-NEXT: jr $ra
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; CHECK-NEXT: nop
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%y = and i32 %x, 1
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%c = icmp eq i32 %y, 1
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store i1 %c, ptr %p
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br i1 %c, label %foo, label %foo
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foo:
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ret void
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}
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