1; RUN: opt < %s -instcombine -S | FileCheck %s 2; PR3021 3 4; When inst combining an FCMP with the LHS coming from a uitofp instruction, we 5; can't lower it to signed ICMP instructions. 6 7define i1 @test1(i32 %val) { 8 %1 = uitofp i32 %val to double 9 %2 = fcmp ole double %1, 0.000000e+00 10; CHECK: icmp eq i32 %val, 0 11 ret i1 %2 12} 13 14define i1 @test2(i32 %val) { 15 %1 = uitofp i32 %val to double 16 %2 = fcmp olt double %1, 0.000000e+00 17 ret i1 %2 18; CHECK: ret i1 false 19} 20 21define i1 @test3(i32 %val) { 22 %1 = uitofp i32 %val to double 23 %2 = fcmp oge double %1, 0.000000e+00 24 ret i1 %2 25; CHECK: ret i1 true 26} 27 28define i1 @test4(i32 %val) { 29 %1 = uitofp i32 %val to double 30 %2 = fcmp ogt double %1, 0.000000e+00 31; CHECK: icmp ne i32 %val, 0 32 ret i1 %2 33} 34 35define i1 @test5(i32 %val) { 36 %1 = uitofp i32 %val to double 37 %2 = fcmp ogt double %1, -4.400000e+00 38 ret i1 %2 39; CHECK: ret i1 true 40} 41 42define i1 @test6(i32 %val) { 43 %1 = uitofp i32 %val to double 44 %2 = fcmp olt double %1, -4.400000e+00 45 ret i1 %2 46; CHECK: ret i1 false 47} 48 49; Check that optimizing unsigned >= comparisons correctly distinguishes 50; positive and negative constants. <rdar://problem/12029145> 51define i1 @test7(i32 %val) { 52 %1 = uitofp i32 %val to double 53 %2 = fcmp oge double %1, 3.200000e+00 54 ret i1 %2 55; CHECK: icmp ugt i32 %val, 3 56} 57