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8d7b0bdcf0
Summary: Mips Linux uses $gp to hold a pointer to thread info structure and accesses it with a named register. This makes this work for LLVM. The N32 ABI doesn't quite work yet since the frontend generates incorrect IR for this case. It neglects to truncate the 64-bit GPR to a 32-bit value before converting to a pointer. Given correct IR (as in the testcase in this patch), it works correctly. Reviewers: sstankovic, vmedic, atanasyan Reviewed By: atanasyan Subscribers: llvm-commits Differential Revision: http://reviews.llvm.org/D6893 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@225529 91177308-0d34-0410-b5e6-96231b3b80d8
18 lines
374 B
LLVM
18 lines
374 B
LLVM
; RUN: llc -march=mips64 -relocation-model=static -mattr=+noabicalls < %s | FileCheck %s
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define i32* @get_gp() {
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entry:
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%0 = call i64 @llvm.read_register.i64(metadata !0)
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%1 = inttoptr i64 %0 to i32*
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ret i32* %1
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}
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; CHECK-LABEL: get_gp:
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; CHECK: move $2, $gp
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declare i64 @llvm.read_register.i64(metadata)
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!llvm.named.register.$28 = !{!0}
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!0 = !{!"$28"}
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