derek.holloway
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80 lines
2.7 KiB
YAML
80 lines
2.7 KiB
YAML
# RUN: llc -mtriple=hexagon -run-pass pipeliner -debug-only=pipeliner %s -o /dev/null 2>&1 -pipeliner-experimental-cg=true | FileCheck %s
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# REQUIRES: asserts
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# Test that the loop carried dependence check correctly identifies dependences
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# when the loop variable decreases and the array index offset is negative.
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# No dependence from the store to the load, but there is a dependence from the
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# load to the store.
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# CHECK: Overlap check:
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# CHECK-NEXT: BaseMI: %{{[0-9]+}}:intregs = L2_loadri_io %{{[0-9]+}}:intregs, -8 :: (load (s32) from %ir.cgep)
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# CHECK-NEXT: Base + -8 + I * -4, Len: 4
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# CHECK-NEXT: OtherMI: S2_storeri_io %{{[0-9]+}}:intregs, 0, %{{[0-9]+}}:intregs :: (store (s32) into %ir.lsr.iv1)
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# CHECK-NEXT: Base + 0 + I * -4, Len: 4
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# CHECK-NEXT: Result: Overlap
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# CHECK: Overlap check:
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# CHECK-NEXT: BaseMI: S2_storeri_io %{{[0-9]+}}:intregs, 0, %{{[0-9]+}}:intregs :: (store (s32) into %ir.lsr.iv1)
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# CHECK-NEXT: Base + 0 + I * -4, Len: 4
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# CHECK-NEXT: OtherMI: %{{[0-9]+}}:intregs = L2_loadri_io %{{[0-9]+}}:intregs, -8 :: (load (s32) from %ir.cgep)
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# CHECK-NEXT: Base + -8 + I * -4, Len: 4
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# CHECK-NEXT: Result: No overlap
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--- |
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define void @test() {
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b0:
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br label %b3
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b3:
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%lsr.iv = phi ptr [ %0, %b3 ], [ undef, %b0 ]
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%v0 = phi i32 [ %v8, %b3 ], [ 7, %b0 ]
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%v1 = phi i32 [ %v6, %b3 ], [ undef, %b0 ]
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%v2 = phi i32 [ %v1, %b3 ], [ undef, %b0 ]
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%lsr.iv1 = bitcast ptr %lsr.iv to ptr
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%cgep = getelementptr i32, ptr %lsr.iv1, i32 -2
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%v6 = load i32, ptr %cgep, align 4
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%v7 = tail call i32 @llvm.hexagon.A2.subsat(i32 %v2, i32 %v6)
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store i32 %v7, ptr %lsr.iv1, align 4
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%v8 = add i32 %v0, -1
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%cgep3 = getelementptr [9 x i32], ptr %lsr.iv, i32 0, i32 -1
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%0 = bitcast ptr %cgep3 to ptr
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%v9 = icmp sgt i32 %v8, 1
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br i1 %v9, label %b3, label %b4
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b4:
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unreachable
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}
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declare i32 @llvm.hexagon.A2.subsat(i32, i32) #0
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declare void @llvm.stackprotector(ptr, ptr) #1
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...
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---
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name: test
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tracksRegLiveness: true
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body: |
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bb.0:
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successors: %bb.1
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%10:intregs = IMPLICIT_DEF
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%11:intregs = IMPLICIT_DEF
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J2_loop0i %bb.1, 6, implicit-def $lc0, implicit-def $sa0, implicit-def $usr
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bb.1 (machine-block-address-taken):
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successors: %bb.1, %bb.2
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%0:intregs = PHI %11, %bb.0, %6, %bb.1
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%2:intregs = PHI %10, %bb.0, %4, %bb.1
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%3:intregs = PHI %10, %bb.0, %2, %bb.1
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%4:intregs = L2_loadri_io %0, -8 :: (load (s32) from %ir.cgep)
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%12:intregs = A2_subsat %3, %4, implicit-def dead $usr_ovf
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S2_storeri_io %0, 0, %12 :: (store (s32) into %ir.lsr.iv1)
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%6:intregs = A2_addi %0, -4
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ENDLOOP0 %bb.1, implicit-def $pc, implicit-def $lc0, implicit $sa0, implicit $lc0
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J2_jump %bb.2, implicit-def dead $pc
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bb.2:
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...
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