784929d045
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
54 lines
1.2 KiB
LLVM
54 lines
1.2 KiB
LLVM
; RUN: opt -mergefunc -S < %s | FileCheck %s
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; CHECK-LABEL: @int_ptr_arg_different
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; CHECK-NEXT: call void asm
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; CHECK-LABEL: @int_ptr_null
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; CHECK-NEXT: tail call void @float_ptr_null()
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; CHECK-LABEL: @int_ptr_arg_same
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; CHECK-NEXT: %2 = bitcast i32* %0 to float*
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; CHECK-NEXT: tail call void @float_ptr_arg_same(float* %2)
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; Used to satisfy minimum size limit
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declare void @stuff()
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; Can be merged
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define void @float_ptr_null() {
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call void asm "nop", "r"(float* null)
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call void @stuff()
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ret void
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}
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define void @int_ptr_null() {
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call void asm "nop", "r"(i32* null)
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call void @stuff()
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ret void
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}
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; Can be merged (uses same argument differing by pointer type)
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define void @float_ptr_arg_same(float*) {
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call void asm "nop", "r"(float* %0)
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call void @stuff()
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ret void
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}
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define void @int_ptr_arg_same(i32*) {
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call void asm "nop", "r"(i32* %0)
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call void @stuff()
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ret void
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}
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; Can not be merged (uses different arguments)
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define void @float_ptr_arg_different(float*, float*) {
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call void asm "nop", "r"(float* %0)
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call void @stuff()
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ret void
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}
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define void @int_ptr_arg_different(i32*, i32*) {
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call void asm "nop", "r"(i32* %1)
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call void @stuff()
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ret void
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}
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