derek.holloway
7502bf64a4
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31 lines
986 B
LLVM
31 lines
986 B
LLVM
; RUN: llc -mtriple=hexagon -O2 < %s | FileCheck -check-prefix=CHECK-DEFAULT %s
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; RUN: llc -mtriple=hexagon -mattr=+reserved-r16 -O2 < %s | FileCheck -check-prefix=CHECK-R16 %s
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; RUN: llc -mtriple=hexagon -mattr=+reserved-r16,+reserved-r17 -O2 < %s | FileCheck -check-prefix=CHECK-R16R17 %s
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; Test that reserved registers are not used by the register allocator.
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; The function has a call, forcing values to be placed in callee-saved
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; registers (R16-R27). Reserving a register must prevent its use.
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declare void @bar()
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define i32 @pressure(i32 %a, i32 %b, i32 %c, i32 %d, i32 %e, i32 %f) {
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%v1 = add i32 %a, %b
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%v2 = mul i32 %v1, %c
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%v3 = sub i32 %v2, %d
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%v4 = add i32 %v3, %e
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%v5 = mul i32 %v4, %f
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call void @bar()
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%v6 = add i32 %v5, %v1
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%v7 = sub i32 %v6, %v2
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%v8 = add i32 %v7, %v3
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%v9 = mul i32 %v8, %v4
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%v10 = sub i32 %v9, %v5
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ret i32 %v10
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}
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; CHECK-DEFAULT: r16
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; CHECK-DEFAULT: r17
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; CHECK-R16-NOT: r16
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; CHECK-R16R17-NOT: r16
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; CHECK-R16R17-NOT: r17
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