303c180199
LLVM so far has only supported the MIPS-II and above architectures. MIPS-II is pretty close to MIPS-I, the major difference being that "load" instructions always take one extra instruction slot to propogate to registers. This patch adds support for MIPS-I by adding hazard handling for load delay slots, alongside MIPSR6 forbidden slots and FPU slots, inserting a NOP instruction between a load and any instruction immediately following that reads the load's destination register. I also included a simple regression test. Since no existing tests target MIPS-I, those all still pass. Issue ref: https://github.com/simias/psx-sdk-rs/issues/1 I also tested by building a simple demo app with Clang and running it in an emulator. Patch by: @impiaaa Differential Revision: https://reviews.llvm.org/D122427
45 lines
1.5 KiB
LLVM
45 lines
1.5 KiB
LLVM
; RUN: llc < %s -mtriple=mips -mcpu=mips1 | FileCheck %s -check-prefixes=ALL,MIPS1
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; RUN: llc < %s -mtriple=mips -mcpu=mips2 | FileCheck %s -check-prefixes=ALL,MIPS2
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; RUN: llc < %s -mtriple=mips -mcpu=mips32r2 | FileCheck %s -check-prefixes=ALL,MIPS32
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target datalayout = "e-m:m-p:32:32-i8:8:32-i16:16:32-i64:64-n32-S64"
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target triple = "mipsel-unknown-unknown-elf"
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; Function Attrs: noinline nounwind optnone
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define dso_local i32 @add_two_pointers(i32* %a, i32* %b) #0 {
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entry:
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; ALL-LABEL: add_two_pointers:
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%a.addr = alloca i32*, align 4
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%b.addr = alloca i32*, align 4
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store i32* %a, i32** %a.addr, align 4
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store i32* %b, i32** %b.addr, align 4
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%0 = load i32*, i32** %a.addr, align 4
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%1 = load i32, i32* %0, align 4
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; ALL: lw $1, 4($fp)
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; MIPS1: nop
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; MIPS2-NOT: nop
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; MIPS32-NOT: nop
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; ALL: lw $1, 0($1)
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%2 = load i32*, i32** %b.addr, align 4
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%3 = load i32, i32* %2, align 4
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; ALL: lw $2, 0($fp)
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; MIPS1: nop
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; MIPS2-NOT: nop
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; MIPS32-NOT: nop
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; ALL: lw $2, 0($2)
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%add = add nsw i32 %1, %3
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ret i32 %add
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; ALL: lw $ra, 12($sp)
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; MIPS1: nop
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; MIPS2-NOT: nop
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; MIPS32-NOT: nop
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; ALL: jr $ra
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}
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attributes #0 = { noinline nounwind optnone "frame-pointer"="all" "min-legal-vector-width"="0" "no-trapping-math"="true" "stack-protector-buffer-size"="8" "target-features"="-noabicalls" }
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!llvm.module.flags = !{!0, !1}
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!0 = !{i32 1, !"wchar_size", i32 4}
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!1 = !{i32 7, !"frame-pointer", i32 2}
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