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TheRock/compiler/amd-llvm/llvm/test/Analysis/ScalarEvolution/trip-count12.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

42 lines
1.8 KiB
LLVM

; NOTE: Assertions have been autogenerated by utils/update_analyze_test_checks.py UTC_ARGS: --version 4
; RUN: opt < %s -disable-output "-passes=print<scalar-evolution>" -scalar-evolution-classify-expressions=0 2>&1 | FileCheck %s
define zeroext i16 @test(ptr nocapture %p, i32 %len) nounwind readonly {
;
; CHECK-LABEL: 'test'
; CHECK-NEXT: Determining loop execution counts for: @test
; CHECK-NEXT: Loop %for.body: backedge-taken count is ((-2 + %len) /u 2)
; CHECK-NEXT: Loop %for.body: constant max backedge-taken count is i32 1073741823
; CHECK-NEXT: Loop %for.body: symbolic max backedge-taken count is ((-2 + %len) /u 2)
; CHECK-NEXT: Loop %for.body: Trip multiple is 1
;
entry:
%cmp2 = icmp sgt i32 %len, 1
br i1 %cmp2, label %for.body.preheader, label %for.end
for.body.preheader: ; preds = %entry
br label %for.body
for.body: ; preds = %for.body, %for.body.preheader
%p.addr.05 = phi ptr [ %incdec.ptr, %for.body ], [ %p, %for.body.preheader ]
%len.addr.04 = phi i32 [ %sub, %for.body ], [ %len, %for.body.preheader ]
%res.03 = phi i32 [ %add, %for.body ], [ 0, %for.body.preheader ]
%incdec.ptr = getelementptr inbounds i16, ptr %p.addr.05, i32 1
%0 = load i16, ptr %p.addr.05, align 2
%conv = zext i16 %0 to i32
%add = add i32 %conv, %res.03
%sub = add nsw i32 %len.addr.04, -2
%cmp = icmp sgt i32 %sub, 1
br i1 %cmp, label %for.body, label %for.cond.for.end_crit_edge
for.cond.for.end_crit_edge: ; preds = %for.body
%extract.t = trunc i32 %add to i16
br label %for.end
for.end: ; preds = %for.cond.for.end_crit_edge, %entry
%res.0.lcssa.off0 = phi i16 [ %extract.t, %for.cond.for.end_crit_edge ], [ 0, %entry ]
ret i16 %res.0.lcssa.off0
}