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This patch accompanies the RFC posted here: http://lists.llvm.org/pipermail/llvm-dev/2018-October/127239.html This patch adds a new CallBr IR instruction to support asm-goto inline assembly like gcc as used by the linux kernel. This instruction is both a call instruction and a terminator instruction with multiple successors. Only inline assembly usage is supported today. This also adds a new INLINEASM_BR opcode to SelectionDAG and MachineIR to represent an INLINEASM block that is also considered a terminator instruction. There will likely be more bug fixes and optimizations to follow this, but we felt it had reached a point where we would like to switch to an incremental development model. Patch by Craig Topper, Alexander Ivchenko, Mikhail Dvoretckii Differential Revision: https://reviews.llvm.org/D53765 llvm-svn: 353563
16 lines
382 B
LLVM
16 lines
382 B
LLVM
; RUN: not llc -mtriple=i686-- < %s 2> %t
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; RUN: FileCheck %s < %t
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; CHECK: Duplicate callbr destination
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; A test for asm-goto duplicate labels limitation
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define i32 @test(i32 %a) {
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entry:
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%0 = add i32 %a, 4
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callbr void asm "xorl $0, $0; jmp ${1:l}", "r,X,~{dirflag},~{fpsr},~{flags}"(i32 %0, i8* blockaddress(@test, %fail)) to label %fail [label %fail]
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fail:
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ret i32 1
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}
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