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- ; RUN: opt < %s -loop-reduce -S | FileCheck %s
- target datalayout = "e-i64:64-v16:16-v32:32-n16:32:64"
- ; for (int i = 0; i < n; ++i) {
- ; use(i * 5 + 3);
- ; // i * a + b is ephemeral and shouldn't be promoted by LSR
- ; __builtin_assume(i * a + b >= 0);
- ; }
- define void @ephemeral(i32 %a, i32 %b, i32 %n) {
- ; CHECK-LABEL: @ephemeral(
- entry:
- br label %loop
- loop:
- %i = phi i32 [ 0, %entry ], [ %inc, %loop ]
- ; Only i and i * 5 + 3 should be indvars, not i * a + b.
- ; CHECK: phi i32
- ; CHECK: phi i32
- ; CHECK-NOT: phi i32
- %inc = add nsw i32 %i, 1
- %exitcond = icmp eq i32 %inc, %n
- %0 = mul nsw i32 %i, 5
- %1 = add nsw i32 %0, 3
- call void @use(i32 %1)
- %2 = mul nsw i32 %i, %a
- %3 = add nsw i32 %2, %b
- %4 = icmp sgt i32 %3, -1
- call void @llvm.assume(i1 %4)
- br i1 %exitcond, label %exit, label %loop
- exit:
- ret void
- }
- declare void @use(i32)
- declare void @llvm.assume(i1)
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