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llvm-mirror/test/CodeGen/BPF/intrinsics.ll
Alexei Starovoitov bcf6ba62a2 [bpf] add support for bpf pseudo instruction
Expose bpf pseudo load instruction via intrinsic. It is used by front-ends that
can encode file descriptors directly into IR instead of relying on relocations.

llvm-svn: 233396
2015-03-27 18:51:42 +00:00

64 lines
1.8 KiB
LLVM

; RUN: llc < %s -march=bpf -show-mc-encoding | FileCheck %s
; Function Attrs: nounwind uwtable
define i32 @ld_b(i64 %foo, i64* nocapture %bar, i8* %ctx, i8* %ctx2) #0 {
%1 = tail call i64 @llvm.bpf.load.byte(i8* %ctx, i64 123) #2
%2 = add i64 %1, %foo
%3 = load volatile i64, i64* %bar, align 8
%4 = add i64 %2, %3
%5 = tail call i64 @llvm.bpf.load.byte(i8* %ctx2, i64 %foo) #2
%6 = add i64 %4, %5
%7 = load volatile i64, i64* %bar, align 8
%8 = add i64 %6, %7
%9 = trunc i64 %8 to i32
ret i32 %9
; CHECK-LABEL: ld_b:
; CHECK: ldabs_b r0, r6.data + 123
; CHECK: ldind_b r0, r6.data
}
declare i64 @llvm.bpf.load.byte(i8*, i64) #1
; Function Attrs: nounwind uwtable
define i32 @ld_h(i8* %ctx, i8* %ctx2, i32 %foo) #0 {
%1 = tail call i64 @llvm.bpf.load.half(i8* %ctx, i64 123) #2
%2 = sext i32 %foo to i64
%3 = tail call i64 @llvm.bpf.load.half(i8* %ctx2, i64 %2) #2
%4 = add i64 %3, %1
%5 = trunc i64 %4 to i32
ret i32 %5
; CHECK-LABEL: ld_h:
; CHECK: ldind_h r0, r6.data
; CHECK: ldabs_h r0, r6.data + 123
}
declare i64 @llvm.bpf.load.half(i8*, i64) #1
; Function Attrs: nounwind uwtable
define i32 @ld_w(i8* %ctx, i8* %ctx2, i32 %foo) #0 {
%1 = tail call i64 @llvm.bpf.load.word(i8* %ctx, i64 123) #2
%2 = sext i32 %foo to i64
%3 = tail call i64 @llvm.bpf.load.word(i8* %ctx2, i64 %2) #2
%4 = add i64 %3, %1
%5 = trunc i64 %4 to i32
ret i32 %5
; CHECK-LABEL: ld_w:
; CHECK: ldind_w r0, r6.data
; CHECK: ldabs_w r0, r6.data + 123
}
declare i64 @llvm.bpf.load.word(i8*, i64) #1
define i32 @ld_pseudo() #0 {
entry:
%call = tail call i64 @llvm.bpf.pseudo(i64 2, i64 3)
tail call void @bar(i64 %call, i32 4) #2
ret i32 0
; CHECK-LABEL: ld_pseudo:
; CHECK: ld_pseudo r1, 2, 3 # encoding: [0x18,0x21,0x00,0x00,0x03,0x00
}
declare void @bar(i64, i32) #1
declare i64 @llvm.bpf.pseudo(i64, i64) #2