From 5337f20c1516296edcea6bc3da6cdc74329142ae Mon Sep 17 00:00:00 2001 From: Benjamin Kramer Date: Mon, 20 Dec 2010 16:18:51 +0000 Subject: Teach InstCombine to merge (icmp ult (X + CA), C1) | (icmp eq X, C2) into (icmp ult (X + CA), C1 + 1) if C2 + CA == C1. InstCombine creates these so now we compile x == 23 || x == 24 || x == 25 to %x.off = add i32 %x, -23 %1 = icmp ult i32 %x.off, 3 instead of %x.off = add i32 %x, -23 %1 = icmp ult i32 %x.off, 2 %cmp3 = icmp eq i32 %x, 25 %ret2 = or i1 %1, %cmp3 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@122248 91177308-0d34-0410-b5e6-96231b3b80d8 --- test/Transforms/InstCombine/or.ll | 14 ++++++++++++++ 1 file changed, 14 insertions(+) (limited to 'test/Transforms/InstCombine/or.ll') diff --git a/test/Transforms/InstCombine/or.ll b/test/Transforms/InstCombine/or.ll index 500cad2..f82f9fa 100644 --- a/test/Transforms/InstCombine/or.ll +++ b/test/Transforms/InstCombine/or.ll @@ -376,3 +376,17 @@ define i32 @test35(i32 %a, i32 %b) { ; CHECK-NEXT: or i32 %a, %b ; CHECK-NEXT: or i32 %1, 1135 } + +define i1 @test36(i32 %x) { + %cmp1 = icmp eq i32 %x, 23 + %cmp2 = icmp eq i32 %x, 24 + %ret1 = or i1 %cmp1, %cmp2 + %cmp3 = icmp eq i32 %x, 25 + %ret2 = or i1 %ret1, %cmp3 + ret i1 %ret2 +; CHECK: @test36 +; CHECK-NEXT: %x.off = add i32 %x, -23 +; CHECK-NEXT: icmp ult i32 %x.off, 3 +; CHECK-NEXT: ret i1 +} + -- cgit v1.1