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TheRock/compiler/amd-llvm/llvm/test/CodeGen/AArch64/ldst-opt-after-block-placement.ll
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derek.holloway 7502bf64a4
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Flatten subprojects into a single base monorepo
2026-09-02 16:34:47 -07:00

52 lines
1.4 KiB
LLVM

; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
; RUN: llc -O3 -mtriple=aarch64-arm < %s | FileCheck %s
; Run at O3 to make sure we can optimize load/store instructions after Machine
; Block Placement takes place using Tail Duplication Threshold = 4.
define void @foo(i1 %cond, ptr %ptr) {
; CHECK-LABEL: foo:
; CHECK: // %bb.0: // %entry
; CHECK-NEXT: tbz w0, #0, .LBB0_2
; CHECK-NEXT: // %bb.1: // %if.then
; CHECK-NEXT: ldp x9, x8, [x1, #8]
; CHECK-NEXT: str xzr, [x1, #16]
; CHECK-NEXT: cmp x8, x9
; CHECK-NEXT: b.lt .LBB0_3
; CHECK-NEXT: b .LBB0_4
; CHECK-NEXT: .LBB0_2: // %if.else
; CHECK-NEXT: ldp x8, x9, [x1]
; CHECK-NEXT: cmp x8, x9
; CHECK-NEXT: b.ge .LBB0_4
; CHECK-NEXT: .LBB0_3: // %exit1
; CHECK-NEXT: str xzr, [x1, #8]
; CHECK-NEXT: .LBB0_4: // %common.ret
; CHECK-NEXT: ret
entry:
br i1 %cond, label %if.then, label %if.else
if.then:
%0 = getelementptr inbounds i64, ptr %ptr, i64 2
%1 = load i64, ptr %0, align 8
store i64 0, ptr %0, align 8
br label %if.end
if.else:
%2 = load i64, ptr %ptr, align 8
br label %if.end
if.end:
%3 = phi i64 [ %1, %if.then ], [ %2, %if.else ]
%4 = getelementptr inbounds i64, ptr %ptr, i64 1
%5 = load i64, ptr %4, align 8
%6 = icmp slt i64 %3, %5
br i1 %6, label %exit1, label %exit2
exit1:
store i64 0, ptr %4, align 8
ret void
exit2:
ret void
}