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0c6deeab94
Similar to PR/25526, fast-regalloc introduces spills at the end of basic blocks. When this occurs in between an ll and sc, the stores can cause the atomic sequence to fail. This patch fixes the issue by introducing more pseudos to represent atomic operations and moving their lowering to after the expansion of postRA pseudos. This version addresses issues with the initial implementation and covers all atomic operations. This resolves PR/32020. Thanks to James Cowgill for reporting the issue! Patch By: Simon Dardis Differential Revision: https://reviews.llvm.org/D31287 llvm-svn: 336328
26 lines
872 B
LLVM
26 lines
872 B
LLVM
; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
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; RUN: llc %s -mtriple=mipsel-unknown-linux-gnu -mcpu=mips32r2 -mattr=micromips -filetype=asm \
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; RUN: -relocation-model=pic -o - | FileCheck %s
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@x = common global i32 0, align 4
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define i32 @AtomicLoadAdd32(i32 %incr) nounwind {
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; CHECK-LABEL: AtomicLoadAdd32:
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; CHECK: # %bb.0: # %entry
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; CHECK-NEXT: lui $2, %hi(_gp_disp)
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; CHECK-NEXT: addiu $2, $2, %lo(_gp_disp)
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; CHECK-NEXT: addu $2, $2, $25
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; CHECK-NEXT: lw $1, %got(x)($2)
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; CHECK-NEXT: $BB0_1: # %entry
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; CHECK-NEXT: # =>This Inner Loop Header: Depth=1
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; CHECK-NEXT: ll $2, 0($1)
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; CHECK-NEXT: addu16 $3, $2, $4
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; CHECK-NEXT: sc $3, 0($1)
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; CHECK-NEXT: beqzc $3, $BB0_1
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; CHECK-NEXT: # %bb.2: # %entry
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; CHECK-NEXT: jrc $ra
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entry:
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%0 = atomicrmw add i32* @x, i32 %incr monotonic
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ret i32 %0
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}
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