; This test case tests the InstructionCombining optimization that | |
; reduces things like: | |
; %Y = sext i8 %X to i32 | |
; %C = icmp ult i32 %Y, 1024 | |
; to | |
; %C = i1 true | |
; It includes test cases for different constant values, signedness of the | |
; cast operands, and types of setCC operators. In all cases, the cast should | |
; be eliminated. In many cases the setCC is also eliminated based on the | |
; constant value and the range of the casted value. | |
; | |
; RUN: opt < %s -instcombine -S | FileCheck %s | |
; END. | |
define i1 @lt_signed_to_large_unsigned(i8 %SB) { | |
%Y = sext i8 %SB to i32 ; <i32> [#uses=1] | |
%C = icmp ult i32 %Y, 1024 ; <i1> [#uses=1] | |
ret i1 %C | |
; CHECK: %C1 = icmp sgt i8 %SB, -1 | |
; CHECK: ret i1 %C1 | |
} | |
define i1 @lt_signed_to_large_signed(i8 %SB) { | |
%Y = sext i8 %SB to i32 ; <i32> [#uses=1] | |
%C = icmp slt i32 %Y, 1024 ; <i1> [#uses=1] | |
ret i1 %C | |
; CHECK: ret i1 true | |
} | |
define i1 @lt_signed_to_large_negative(i8 %SB) { | |
%Y = sext i8 %SB to i32 ; <i32> [#uses=1] | |
%C = icmp slt i32 %Y, -1024 ; <i1> [#uses=1] | |
ret i1 %C | |
; CHECK: ret i1 false | |
} | |
define i1 @lt_signed_to_small_unsigned(i8 %SB) { | |
%Y = sext i8 %SB to i32 | |
%C = icmp ult i32 %Y, 17 | |
ret i1 %C | |
; CHECK: %C = icmp ult i8 %SB, 17 | |
; CHECK: ret i1 %C | |
} | |
define i1 @lt_signed_to_small_signed(i8 %SB) { | |
%Y = sext i8 %SB to i32 ; <i32> [#uses=1] | |
%C = icmp slt i32 %Y, 17 ; <i1> [#uses=1] | |
ret i1 %C | |
; CHECK: %C = icmp slt i8 %SB, 17 | |
; CHECK: ret i1 %C | |
} | |
define i1 @lt_signed_to_small_negative(i8 %SB) { | |
%Y = sext i8 %SB to i32 ; <i32> [#uses=1] | |
%C = icmp slt i32 %Y, -17 ; <i1> [#uses=1] | |
ret i1 %C | |
; CHECK: %C = icmp slt i8 %SB, -17 | |
; CHECK: ret i1 %C | |
} | |
define i1 @lt_unsigned_to_large_unsigned(i8 %SB) { | |
%Y = zext i8 %SB to i32 ; <i32> [#uses=1] | |
%C = icmp ult i32 %Y, 1024 ; <i1> [#uses=1] | |
ret i1 %C | |
; CHECK: ret i1 true | |
} | |
define i1 @lt_unsigned_to_large_signed(i8 %SB) { | |
%Y = zext i8 %SB to i32 ; <i32> [#uses=1] | |
%C = icmp slt i32 %Y, 1024 ; <i1> [#uses=1] | |
ret i1 %C | |
; CHECK: ret i1 true | |
} | |
define i1 @lt_unsigned_to_large_negative(i8 %SB) { | |
%Y = zext i8 %SB to i32 ; <i32> [#uses=1] | |
%C = icmp slt i32 %Y, -1024 ; <i1> [#uses=1] | |
ret i1 %C | |
; CHECK: ret i1 false | |
} | |
define i1 @lt_unsigned_to_small_unsigned(i8 %SB) { | |
%Y = zext i8 %SB to i32 ; <i32> [#uses=1] | |
%C = icmp ult i32 %Y, 17 ; <i1> [#uses=1] | |
ret i1 %C | |
; CHECK: %C = icmp ult i8 %SB, 17 | |
; CHECK: ret i1 %C | |
} | |
define i1 @lt_unsigned_to_small_signed(i8 %SB) { | |
%Y = zext i8 %SB to i32 | |
%C = icmp slt i32 %Y, 17 | |
ret i1 %C | |
; CHECK: %C = icmp ult i8 %SB, 17 | |
; CHECK: ret i1 %C | |
} | |
define i1 @lt_unsigned_to_small_negative(i8 %SB) { | |
%Y = zext i8 %SB to i32 ; <i32> [#uses=1] | |
%C = icmp slt i32 %Y, -17 ; <i1> [#uses=1] | |
ret i1 %C | |
; CHECK: ret i1 false | |
} | |
define i1 @gt_signed_to_large_unsigned(i8 %SB) { | |
%Y = sext i8 %SB to i32 ; <i32> [#uses=1] | |
%C = icmp ugt i32 %Y, 1024 ; <i1> [#uses=1] | |
ret i1 %C | |
; CHECK: %C = icmp slt i8 %SB, 0 | |
; CHECK: ret i1 %C | |
} | |
define i1 @gt_signed_to_large_signed(i8 %SB) { | |
%Y = sext i8 %SB to i32 ; <i32> [#uses=1] | |
%C = icmp sgt i32 %Y, 1024 ; <i1> [#uses=1] | |
ret i1 %C | |
; CHECK: ret i1 false | |
} | |
define i1 @gt_signed_to_large_negative(i8 %SB) { | |
%Y = sext i8 %SB to i32 ; <i32> [#uses=1] | |
%C = icmp sgt i32 %Y, -1024 ; <i1> [#uses=1] | |
ret i1 %C | |
; CHECK: ret i1 true | |
} | |
define i1 @gt_signed_to_small_unsigned(i8 %SB) { | |
%Y = sext i8 %SB to i32 | |
%C = icmp ugt i32 %Y, 17 | |
ret i1 %C | |
; CHECK: %C = icmp ugt i8 %SB, 17 | |
; CHECK: ret i1 %C | |
} | |
define i1 @gt_signed_to_small_signed(i8 %SB) { | |
%Y = sext i8 %SB to i32 ; <i32> [#uses=1] | |
%C = icmp sgt i32 %Y, 17 ; <i1> [#uses=1] | |
ret i1 %C | |
; CHECK: %C = icmp sgt i8 %SB, 17 | |
; CHECK: ret i1 %C | |
} | |
define i1 @gt_signed_to_small_negative(i8 %SB) { | |
%Y = sext i8 %SB to i32 ; <i32> [#uses=1] | |
%C = icmp sgt i32 %Y, -17 ; <i1> [#uses=1] | |
ret i1 %C | |
; CHECK: %C = icmp sgt i8 %SB, -17 | |
; CHECK: ret i1 %C | |
} | |
define i1 @gt_unsigned_to_large_unsigned(i8 %SB) { | |
%Y = zext i8 %SB to i32 ; <i32> [#uses=1] | |
%C = icmp ugt i32 %Y, 1024 ; <i1> [#uses=1] | |
ret i1 %C | |
; CHECK: ret i1 false | |
} | |
define i1 @gt_unsigned_to_large_signed(i8 %SB) { | |
%Y = zext i8 %SB to i32 ; <i32> [#uses=1] | |
%C = icmp sgt i32 %Y, 1024 ; <i1> [#uses=1] | |
ret i1 %C | |
; CHECK: ret i1 false | |
} | |
define i1 @gt_unsigned_to_large_negative(i8 %SB) { | |
%Y = zext i8 %SB to i32 ; <i32> [#uses=1] | |
%C = icmp sgt i32 %Y, -1024 ; <i1> [#uses=1] | |
ret i1 %C | |
; CHECK: ret i1 true | |
} | |
define i1 @gt_unsigned_to_small_unsigned(i8 %SB) { | |
%Y = zext i8 %SB to i32 ; <i32> [#uses=1] | |
%C = icmp ugt i32 %Y, 17 ; <i1> [#uses=1] | |
ret i1 %C | |
; CHECK: %C = icmp ugt i8 %SB, 17 | |
; CHECK: ret i1 %C | |
} | |
define i1 @gt_unsigned_to_small_signed(i8 %SB) { | |
%Y = zext i8 %SB to i32 | |
%C = icmp sgt i32 %Y, 17 | |
ret i1 %C | |
; CHECK: %C = icmp ugt i8 %SB, 17 | |
; CHECK: ret i1 %C | |
} | |
define i1 @gt_unsigned_to_small_negative(i8 %SB) { | |
%Y = zext i8 %SB to i32 ; <i32> [#uses=1] | |
%C = icmp sgt i32 %Y, -17 ; <i1> [#uses=1] | |
ret i1 %C | |
; CHECK: ret i1 true | |
} | |