llvm-6502/test/Transforms/InstCombine/load-cmp.ll
Chris Lattner 56ba7a74b9 generalize the previous transformation to handle indexing into
arrays of structs and other arrays, so long as all the subsequent
indexes are constants.  This triggers frequently for stuff like:

@divisions = internal constant [29 x [2 x i32]] [[2 x i32] zeroinitializer, [2 x i32] [i32 0, i32 1], [2 x i32] [i32 0, i32 2], [2 x i32] [i32 0, i32 1], [2 x i32] zeroinitializer, [2 x i32] [i32 0, i32 1], [2 x i32] [i32 0, i32 1], [2 x i32] [i32 0, i32 2], [2 x i32] [i32 0, i32 2], [2 x i32] zeroinitializer, [2 x i32] zeroinitializer, [2 x i32] zeroinitializer, [2 x i32] [i32 0, i32 2], [2 x i32] [i32 0, i32 1], [2 x i32] zeroinitializer, [2 x i32] [i32 1, i32 0], [2 x i32] [i32 1, i32 1], [2 x i32] [i32 1, i32 1], [2 x i32] [i32 1, i32 2], [2 x i32] [i32 1, i32 1], [2 x i32] [i32 1, i32 0], [2 x i32] [i32 1, i32 2], [2 x i32] [i32 1, i32 2], [2 x i32] [i32 1, i32 0], [2 x i32] [i32 1, i32 0], [2 x i32] [i32 1, i32 0], [2 x i32] [i32 1, i32 1], [2 x i32] [i32 1, i32 2], [2 x i32] [i32 1, i32 2]], align 32 ; <[29 x [2 x i32]]*> [#uses=50]

	  %623 = getelementptr inbounds [29 x [2 x i32]]* @divisions, i64 0, i64 %619, i64 0 ; <i32*> [#uses=1]
	   %684 = icmp eq i32 %683, 999 

also for the "my_defs" table in 'gs', etc.




git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@92444 91177308-0d34-0410-b5e6-96231b3b80d8
2010-01-03 03:03:27 +00:00

113 lines
2.7 KiB
LLVM

; RUN: opt < %s -instcombine -S | FileCheck %s
@G16 = internal constant [10 x i16] [i16 35, i16 82, i16 69, i16 81, i16 85,
i16 73, i16 82, i16 69, i16 68, i16 0]
@GD = internal constant [6 x double]
[double -10.0, double 1.0, double 4.0, double 2.0, double -20.0, double -40.0]
define i1 @test1(i32 %X) {
%P = getelementptr [10 x i16]* @G16, i32 0, i32 %X
%Q = load i16* %P
%R = icmp eq i16 %Q, 0
ret i1 %R
; CHECK: @test1
; CHECK-NEXT: %R = icmp eq i32 %X, 9
; CHECK-NEXT: ret i1 %R
}
define i1 @test2(i32 %X) {
%P = getelementptr [10 x i16]* @G16, i32 0, i32 %X
%Q = load i16* %P
%R = icmp slt i16 %Q, 85
ret i1 %R
; CHECK: @test2
; CHECK-NEXT: %R = icmp ne i32 %X, 4
; CHECK-NEXT: ret i1 %R
}
define i1 @test3(i32 %X) {
%P = getelementptr [6 x double]* @GD, i32 0, i32 %X
%Q = load double* %P
%R = fcmp oeq double %Q, 1.0
ret i1 %R
; CHECK: @test3
; CHECK-NEXT: %R = icmp eq i32 %X, 1
; CHECK-NEXT: ret i1 %R
}
define i1 @test4(i32 %X) {
%P = getelementptr [10 x i16]* @G16, i32 0, i32 %X
%Q = load i16* %P
%R = icmp sle i16 %Q, 73
ret i1 %R
; CHECK: @test4
; CHECK-NEXT: lshr i32 933, %X
; CHECK-NEXT: and i32 {{.*}}, 1
; CHECK-NEXT: %R = icmp ne i32 {{.*}}, 0
; CHECK-NEXT: ret i1 %R
}
define i1 @test5(i32 %X) {
%P = getelementptr [10 x i16]* @G16, i32 0, i32 %X
%Q = load i16* %P
%R = icmp eq i16 %Q, 69
ret i1 %R
; CHECK: @test5
; CHECK-NEXT: icmp eq i32 %X, 2
; CHECK-NEXT: icmp eq i32 %X, 7
; CHECK-NEXT: %R = or i1
; CHECK-NEXT: ret i1 %R
}
define i1 @test6(i32 %X) {
%P = getelementptr [6 x double]* @GD, i32 0, i32 %X
%Q = load double* %P
%R = fcmp ogt double %Q, 0.0
ret i1 %R
; CHECK: @test6
; CHECK-NEXT: add i32 %X, -1
; CHECK-NEXT: %R = icmp ult i32 {{.*}}, 3
; CHECK-NEXT: ret i1 %R
}
define i1 @test7(i32 %X) {
%P = getelementptr [6 x double]* @GD, i32 0, i32 %X
%Q = load double* %P
%R = fcmp olt double %Q, 0.0
ret i1 %R
; CHECK: @test7
; CHECK-NEXT: add i32 %X, -1
; CHECK-NEXT: %R = icmp ugt i32 {{.*}}, 2
; CHECK-NEXT: ret i1 %R
}
define i1 @test8(i32 %X) {
%P = getelementptr [10 x i16]* @G16, i32 0, i32 %X
%Q = load i16* %P
%R = and i16 %Q, 3
%S = icmp eq i16 %R, 0
ret i1 %S
; CHECK: @test8
; CHECK-NEXT: add i32 %X, -8
; CHECK-NEXT: %S = icmp ult i32 {{.*}}, 2
; CHECK-NEXT: ret i1 %S
}
@GA = internal constant [4 x { i32, i32 } ] [
{ i32, i32 } { i32 1, i32 0 },
{ i32, i32 } { i32 2, i32 1 },
{ i32, i32 } { i32 3, i32 1 },
{ i32, i32 } { i32 4, i32 0 }
]
define i1 @test9(i32 %X) {
%P = getelementptr [4 x { i32, i32 } ]* @GA, i32 0, i32 %X, i32 1
%Q = load i32* %P
%R = icmp eq i32 %Q, 1
ret i1 %R
; CHECK: @test9
; CHECK-NEXT: add i32 %X, -1
; CHECK-NEXT: %R = icmp ult i32 {{.*}}, 2
; CHECK-NEXT: ret i1 %R
}