394f30919a
This patch adds support for constraints `f`, `l`, `I`, `K` according to [1]. The remain constraints (`k`, `m`, `ZB`, `ZC`) will be added later as they are a little more complex than the others. f: A floating-point register (if available). l: A signed 16-bit constant. I: A signed 12-bit constant (for arithmetic instructions). K: An unsigned 12-bit constant (for logic instructions). For now, no need to support register alias (e.g. `$a0`) in llvm as clang will correctly decode the usage of register name aliases into their official names. And AFAIK, the not yet upstreamed `rustc` for LoongArch will always use official register names (e.g. `$r4`). [1] https://gcc.gnu.org/onlinedocs/gccint/Machine-Constraints.html Differential Revision: https://reviews.llvm.org/D134157
15 lines
510 B
LLVM
15 lines
510 B
LLVM
; RUN: not llc --mtriple=loongarch32 2>&1 < %s | FileCheck %s
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; RUN: not llc --mtriple=loongarch64 2>&1 < %s | FileCheck %s
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define i32 @non_exit_r32(i32 %a) nounwind {
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; CHECK: error: couldn't allocate input reg for constraint '{$r32}'
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%1 = tail call i32 asm "addi.w $0, $1, 1", "=r,{$r32}"(i32 %a)
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ret i32 %1
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}
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define i32 @non_exit_foo(i32 %a) nounwind {
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; CHECK: error: couldn't allocate input reg for constraint '{$foo}'
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%1 = tail call i32 asm "addi.w $0, $1, 1", "=r,{$foo}"(i32 %a)
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ret i32 %1
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}
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