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c66cdf74a9
basic tests. This has been well tested on Darwin but not elsewhere. It should work provided the linker correctly resolves B.W <label in other function> which it has not seen before, at least from llvm-based compilers. I'm leaving the arm-tail-calls switch in until I see if there's any problems because of that; it might need to be disabled for some environments. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@106299 91177308-0d34-0410-b5e6-96231b3b80d8
87 lines
2.5 KiB
LLVM
87 lines
2.5 KiB
LLVM
; RUN: llc < %s -mtriple=thumbv7-apple-darwin | FileCheck %s
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define i32 @t1(i32 %a, i32 %b, i32 %c, i32 %d) nounwind {
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; CHECK: t1:
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; CHECK: it ne
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; CHECK: cmpne
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switch i32 %c, label %cond_next [
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i32 1, label %cond_true
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i32 7, label %cond_true
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]
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cond_true:
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%tmp12 = add i32 %a, 1
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%tmp1518 = add i32 %tmp12, %b
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ret i32 %tmp1518
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cond_next:
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%tmp15 = add i32 %b, %a
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ret i32 %tmp15
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}
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; FIXME: Check for # of unconditional branch after adding branch folding post ifcvt.
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define i32 @t2(i32 %a, i32 %b) nounwind {
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entry:
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; CHECK: t2:
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; CHECK: ite gt
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; CHECK: subgt
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; CHECK: suble
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%tmp1434 = icmp eq i32 %a, %b ; <i1> [#uses=1]
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br i1 %tmp1434, label %bb17, label %bb.outer
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bb.outer: ; preds = %cond_false, %entry
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%b_addr.021.0.ph = phi i32 [ %b, %entry ], [ %tmp10, %cond_false ] ; <i32> [#uses=5]
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%a_addr.026.0.ph = phi i32 [ %a, %entry ], [ %a_addr.026.0, %cond_false ] ; <i32> [#uses=1]
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br label %bb
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bb: ; preds = %cond_true, %bb.outer
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%indvar = phi i32 [ 0, %bb.outer ], [ %indvar.next, %cond_true ] ; <i32> [#uses=2]
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%tmp. = sub i32 0, %b_addr.021.0.ph ; <i32> [#uses=1]
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%tmp.40 = mul i32 %indvar, %tmp. ; <i32> [#uses=1]
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%a_addr.026.0 = add i32 %tmp.40, %a_addr.026.0.ph ; <i32> [#uses=6]
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%tmp3 = icmp sgt i32 %a_addr.026.0, %b_addr.021.0.ph ; <i1> [#uses=1]
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br i1 %tmp3, label %cond_true, label %cond_false
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cond_true: ; preds = %bb
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%tmp7 = sub i32 %a_addr.026.0, %b_addr.021.0.ph ; <i32> [#uses=2]
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%tmp1437 = icmp eq i32 %tmp7, %b_addr.021.0.ph ; <i1> [#uses=1]
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%indvar.next = add i32 %indvar, 1 ; <i32> [#uses=1]
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br i1 %tmp1437, label %bb17, label %bb
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cond_false: ; preds = %bb
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%tmp10 = sub i32 %b_addr.021.0.ph, %a_addr.026.0 ; <i32> [#uses=2]
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%tmp14 = icmp eq i32 %a_addr.026.0, %tmp10 ; <i1> [#uses=1]
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br i1 %tmp14, label %bb17, label %bb.outer
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bb17: ; preds = %cond_false, %cond_true, %entry
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%a_addr.026.1 = phi i32 [ %a, %entry ], [ %tmp7, %cond_true ], [ %a_addr.026.0, %cond_false ] ; <i32> [#uses=1]
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ret i32 %a_addr.026.1
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}
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@x = external global i32* ; <i32**> [#uses=1]
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define void @foo(i32 %a) nounwind {
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entry:
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%tmp = load i32** @x ; <i32*> [#uses=1]
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store i32 %a, i32* %tmp
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ret void
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}
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; Tail call prevents use of ifcvt in this one. Seems like a win though.
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define void @t3(i32 %a, i32 %b) nounwind {
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entry:
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; CHECK: t3:
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; CHECK-NOT: it lt
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; CHECK-NOT: poplt
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; CHECK: b.w _foo @ TAILCALL
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%tmp1 = icmp sgt i32 %a, 10 ; <i1> [#uses=1]
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br i1 %tmp1, label %cond_true, label %UnifiedReturnBlock
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cond_true: ; preds = %entry
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tail call void @foo( i32 %b )
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ret void
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UnifiedReturnBlock: ; preds = %entry
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ret void
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}
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