derek.holloway
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51 lines
1.9 KiB
YAML
51 lines
1.9 KiB
YAML
# NOTE: Assertions have been autogenerated by utils/update_mir_test_checks.py
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# RUN: llc -run-pass regallocfast %s -o - | FileCheck %s
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# RUN: llc -passes=regallocfast %s -o - | FileCheck %s
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# This test examines register allocation and spilling with Fast Register
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# Allocator. The test uses inline assembler that requests an input variable to
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# be loaded in a high register but at the same time has r12 marked as clobbered.
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# The allocator initially satisfies the load request by selecting r12 but then
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# needs to spill this register when it reaches the INLINEASM instruction and
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# notices its clobber definition.
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#
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# The test checks that the compiler is able to spill a register from the hGPR
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# class in Thumb2 by inserting the t2STRi12/t2LDRi12 instructions.
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--- |
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; ModuleID = 'test.ll'
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source_filename = "test.c"
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target datalayout = "e-m:e-p:32:32-i64:64-v128:64:128-a:0:32-n32-S64"
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target triple = "thumbv7m-none-unknown-eabi"
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define dso_local void @constraint_h() {
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entry:
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%i = alloca i32, align 4
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%0 = load i32, ptr %i, align 4
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call void asm sideeffect "@ $0", "h,~{r12}"(i32 %0)
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ret void
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}
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...
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---
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name: constraint_h
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tracksRegLiveness: true
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registers:
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- { id: 0, class: hgpr }
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- { id: 1, class: tgpr }
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stack:
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- { id: 0, name: i, size: 4, alignment: 4, stack-id: default, local-offset: -4 }
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body: |
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bb.0.entry:
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; CHECK-LABEL: name: constraint_h
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; CHECK: renamable $r0 = tLDRspi %stack.0.i, 0, 14 /* CC::al */, $noreg :: (dereferenceable load (s32) from %ir.i)
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; CHECK: renamable $r8 = COPY killed renamable $r0
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; CHECK: INLINEASM &"@ $0", sideeffect attdialect, reguse:GPRnopc, killed renamable $r8, clobber, implicit-def dead early-clobber $r12
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; CHECK: tBX_RET 14 /* CC::al */, $noreg
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%1:tgpr = tLDRspi %stack.0.i, 0, 14, $noreg :: (dereferenceable load (s32) from %ir.i)
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%0:hgpr = COPY %1
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INLINEASM &"@ $0", 1, 589833, %0, 12, implicit-def early-clobber $r12
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tBX_RET 14, $noreg
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...
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