From 5bf7f88ea28dae0cad4f311cc5ef708b6ce50e8f Mon Sep 17 00:00:00 2001 From: Nick Lewycky Date: Thu, 4 Mar 2010 06:54:10 +0000 Subject: Make the 'icmp pred trunc(ext(X)), CST --> icmp pred X, ext(trunc(CST))' transformation much more careful. Truncating binary '01' to '1' sounds like it's safe until you realize that it switched from positive to negative under a signed interpretation, and that depends on the icmp predicate. Also a few miscellaneous cleanups. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@97721 91177308-0d34-0410-b5e6-96231b3b80d8 --- test/Transforms/InstCombine/2010-03-03-ExtElim.ll | 18 ++++++++++++++++++ 1 file changed, 18 insertions(+) create mode 100644 test/Transforms/InstCombine/2010-03-03-ExtElim.ll (limited to 'test/Transforms/InstCombine/2010-03-03-ExtElim.ll') diff --git a/test/Transforms/InstCombine/2010-03-03-ExtElim.ll b/test/Transforms/InstCombine/2010-03-03-ExtElim.ll new file mode 100644 index 0000000000..2df12d670a --- /dev/null +++ b/test/Transforms/InstCombine/2010-03-03-ExtElim.ll @@ -0,0 +1,18 @@ +; RUN: opt -instcombine -S %s | FileCheck %s +; PR6486 + +target datalayout = "e-p:32:32:32-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:32:64-f32:32:32-f64:32:64-v64:64:64-v128:128:128-a0:0:64-f80:32:32-n8:16:32" +target triple = "i386-unknown-linux-gnu" + +@g_92 = common global [2 x i32*] zeroinitializer, align 4 ; <[2 x i32*]*> [#uses=1] +@g_177 = constant i32** bitcast (i8* getelementptr (i8* bitcast ([2 x i32*]* @g_92 to i8*), i64 4) to i32**), align 4 ; [#uses=1] + +define i1 @test() nounwind { +; CHECK: @test + %tmp = load i32*** @g_177 ; [#uses=1] + %cmp = icmp ne i32** null, %tmp ; [#uses=1] + %conv = zext i1 %cmp to i32 ; [#uses=1] + %cmp1 = icmp sle i32 0, %conv ; [#uses=1] + ret i1 %cmp1 +; CHECK: ret i1 true +} -- cgit v1.2.3