118d4234ac
On 64-bit target, prefer using RDPC over CALL to get the value of %pc. This is faster on modern processors (Niagara T1 and newer) and avoids polluting the processor's predictor state. The old behavior of using a fake CALL is still done when tuning for classic UltraSPARC processors, since RDPC is much slower there. A quick pgbench test on a SPARC T4 shows about 2% speedup on SELECT loads, and about 7% speedup on INSERT/UPDATE loads. Reviewed By: @s-barannikov Github PR: https://github.com/llvm/llvm-project/pull/78280
52 lines
1.8 KiB
LLVM
52 lines
1.8 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
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; RUN: llc < %s -relocation-model=pic -mtriple=sparc | FileCheck --check-prefix=SPARC %s
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; RUN: llc < %s -relocation-model=pic -mtriple=sparcv9 | FileCheck --check-prefix=SPARC64 %s
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;; SPARC32 and SPARC64 for classic UltraSPARCs implement GETPCX
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;; with a fake `call`.
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;; All other SPARC64 targets implement it with `rd %pc, %o7`.
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;; Need to do the tests in separate files because apparently `tune-cpu`
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;; attribute applies to the entire file at once.
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@value = external global i32
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define i32 @testCall() nounwind #0 {
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; SPARC-LABEL: testCall:
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; SPARC: ! %bb.0:
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; SPARC-NEXT: save %sp, -96, %sp
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; SPARC-NEXT: .Ltmp0:
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; SPARC-NEXT: call .Ltmp1
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; SPARC-NEXT: .Ltmp2:
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; SPARC-NEXT: sethi %hi(_GLOBAL_OFFSET_TABLE_+(.Ltmp2-.Ltmp0)), %i0
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; SPARC-NEXT: .Ltmp1:
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; SPARC-NEXT: or %i0, %lo(_GLOBAL_OFFSET_TABLE_+(.Ltmp1-.Ltmp0)), %i0
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; SPARC-NEXT: add %i0, %o7, %i0
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; SPARC-NEXT: sethi %hi(value), %i1
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; SPARC-NEXT: add %i1, %lo(value), %i1
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; SPARC-NEXT: ld [%i0+%i1], %i0
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; SPARC-NEXT: ld [%i0], %i0
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; SPARC-NEXT: ret
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; SPARC-NEXT: restore
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;
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; SPARC64-LABEL: testCall:
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; SPARC64: ! %bb.0:
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; SPARC64-NEXT: save %sp, -128, %sp
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; SPARC64-NEXT: .Ltmp0:
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; SPARC64-NEXT: call .Ltmp1
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; SPARC64-NEXT: .Ltmp2:
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; SPARC64-NEXT: sethi %hi(_GLOBAL_OFFSET_TABLE_+(.Ltmp2-.Ltmp0)), %i0
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; SPARC64-NEXT: .Ltmp1:
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; SPARC64-NEXT: or %i0, %lo(_GLOBAL_OFFSET_TABLE_+(.Ltmp1-.Ltmp0)), %i0
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; SPARC64-NEXT: add %i0, %o7, %i0
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; SPARC64-NEXT: sethi %hi(value), %i1
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; SPARC64-NEXT: add %i1, %lo(value), %i1
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; SPARC64-NEXT: ldx [%i0+%i1], %i0
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; SPARC64-NEXT: ld [%i0], %i0
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; SPARC64-NEXT: ret
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; SPARC64-NEXT: restore
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%1 = load i32, ptr @value
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ret i32 %1
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}
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attributes #0 = { "tune-cpu"="ultrasparc" }
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