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llvm-mirror/test/Transforms/InstCombine/logical-select.ll
Sanjay Patel 500fe712ac [InstCombine] look through bitcasts to find selects 
There was concern that creating bitcasts for the simpler potential select pattern:

define <2 x i64> @vecBitcastOp1(<4 x i1> %cmp, <2 x i64> %a) {
  %a2 = add <2 x i64> %a, %a
  %sext = sext <4 x i1> %cmp to <4 x i32>
  %bc = bitcast <4 x i32> %sext to <2 x i64>
  %and = and <2 x i64> %a2, %bc
  ret <2 x i64> %and
}

might lead to worse code for some targets, so this patch is matching the larger
patterns seen in the test cases.

The motivating example for this patch is this IR produced via SSE intrinsics in C:

define <2 x i64> @gibson(<2 x i64> %a, <2 x i64> %b) {
  %t0 = bitcast <2 x i64> %a to <4 x i32>
  %t1 = bitcast <2 x i64> %b to <4 x i32>
  %cmp = icmp sgt <4 x i32> %t0, %t1
  %sext = sext <4 x i1> %cmp to <4 x i32>
  %t2 = bitcast <4 x i32> %sext to <2 x i64>
  %and = and <2 x i64> %t2, %a
  %neg = xor <4 x i32> %sext, <i32 -1, i32 -1, i32 -1, i32 -1>
  %neg2 = bitcast <4 x i32> %neg to <2 x i64>
  %and2 = and <2 x i64> %neg2, %b
  %or = or <2 x i64> %and, %and2
  ret <2 x i64> %or
}

For an AVX target, this is currently:

vpcmpgtd  %xmm1, %xmm0, %xmm2
vpand     %xmm0, %xmm2, %xmm0
vpandn    %xmm1, %xmm2, %xmm1
vpor      %xmm1, %xmm0, %xmm0
retq

With this patch, it becomes:

vpmaxsd   %xmm1, %xmm0, %xmm0

Differential Revision: http://reviews.llvm.org/D20774

llvm-svn: 271676
2016-06-03 14:42:07 +00:00

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5.3 KiB
LLVM
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; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
; RUN: opt < %s -instcombine -S | FileCheck %s
define i32 @foo(i32 %a, i32 %b, i32 %c, i32 %d) {
; CHECK-LABEL: @foo(
; CHECK-NEXT: [[E:%.*]] = icmp slt i32 %a, %b
; CHECK-NEXT: [[J:%.*]] = select i1 [[E]], i32 %c, i32 %d
; CHECK-NEXT: ret i32 [[J]]
;
%e = icmp slt i32 %a, %b
%f = sext i1 %e to i32
%g = and i32 %c, %f
%h = xor i32 %f, -1
%i = and i32 %d, %h
%j = or i32 %g, %i
ret i32 %j
}
define i32 @bar(i32 %a, i32 %b, i32 %c, i32 %d) {
; CHECK-LABEL: @bar(
; CHECK-NEXT: [[E:%.*]] = icmp slt i32 %a, %b
; CHECK-NEXT: [[J:%.*]] = select i1 [[E]], i32 %c, i32 %d
; CHECK-NEXT: ret i32 [[J]]
;
%e = icmp slt i32 %a, %b
%f = sext i1 %e to i32
%g = and i32 %c, %f
%h = xor i32 %f, -1
%i = and i32 %d, %h
%j = or i32 %i, %g
ret i32 %j
}
define i32 @goo(i32 %a, i32 %b, i32 %c, i32 %d) {
; CHECK-LABEL: @goo(
; CHECK-NEXT: [[T0:%.*]] = icmp slt i32 %a, %b
; CHECK-NEXT: [[T3:%.*]] = select i1 [[T0]], i32 %c, i32 %d
; CHECK-NEXT: ret i32 [[T3]]
;
%t0 = icmp slt i32 %a, %b
%iftmp.0.0 = select i1 %t0, i32 -1, i32 0
%t1 = and i32 %iftmp.0.0, %c
%not = xor i32 %iftmp.0.0, -1
%t2 = and i32 %not, %d
%t3 = or i32 %t1, %t2
ret i32 %t3
}
define i32 @poo(i32 %a, i32 %b, i32 %c, i32 %d) {
; CHECK-LABEL: @poo(
; CHECK-NEXT: [[T0:%.*]] = icmp slt i32 %a, %b
; CHECK-NEXT: [[T3:%.*]] = select i1 [[T0]], i32 %c, i32 %d
; CHECK-NEXT: ret i32 [[T3]]
;
%t0 = icmp slt i32 %a, %b
%iftmp.0.0 = select i1 %t0, i32 -1, i32 0
%t1 = and i32 %iftmp.0.0, %c
%iftmp = select i1 %t0, i32 0, i32 -1
%t2 = and i32 %iftmp, %d
%t3 = or i32 %t1, %t2
ret i32 %t3
}
define i32 @par(i32 %a, i32 %b, i32 %c, i32 %d) {
; CHECK-LABEL: @par(
; CHECK-NEXT: [[T0:%.*]] = icmp slt i32 %a, %b
; CHECK-NEXT: [[T3:%.*]] = select i1 [[T0]], i32 %c, i32 %d
; CHECK-NEXT: ret i32 [[T3]]
;
%t0 = icmp slt i32 %a, %b
%iftmp.1.0 = select i1 %t0, i32 -1, i32 0
%t1 = and i32 %iftmp.1.0, %c
%not = xor i32 %iftmp.1.0, -1
%t2 = and i32 %not, %d
%t3 = or i32 %t1, %t2
ret i32 %t3
}
; In the following tests, verify that a bitcast doesn't get in the way
; of a select transform. These bitcasts are common in SSE/AVX and possibly
; other vector code because of canonicalization to i64 elements for vectors.
define <2 x i64> @bitcast_select(<4 x i1> %cmp, <2 x i64> %a, <2 x i64> %b) {
; CHECK-LABEL: @bitcast_select(
; CHECK-NEXT: [[TMP1:%.*]] = bitcast <2 x i64> %a to <4 x i32>
; CHECK-NEXT: [[TMP2:%.*]] = bitcast <2 x i64> %b to <4 x i32>
; CHECK-NEXT: [[TMP3:%.*]] = select <4 x i1> %cmp, <4 x i32> [[TMP1]], <4 x i32> [[TMP2]]
; CHECK-NEXT: [[OR:%.*]] = bitcast <4 x i32> [[TMP3]] to <2 x i64>
; CHECK-NEXT: ret <2 x i64> [[OR]]
;
%sext = sext <4 x i1> %cmp to <4 x i32>
%t2 = bitcast <4 x i32> %sext to <2 x i64>
%and = and <2 x i64> %t2, %a
%neg = xor <4 x i32> %sext, <i32 -1, i32 -1, i32 -1, i32 -1>
%neg2 = bitcast <4 x i32> %neg to <2 x i64>
%and2 = and <2 x i64> %neg2, %b
%or = or <2 x i64> %and, %and2
ret <2 x i64> %or
}
define <2 x i64> @bitcast_select_swap_or_ops(<4 x i1> %cmp, <2 x i64> %a, <2 x i64> %b) {
; CHECK-LABEL: @bitcast_select_swap_or_ops(
; CHECK-NEXT: [[TMP1:%.*]] = bitcast <2 x i64> %a to <4 x i32>
; CHECK-NEXT: [[TMP2:%.*]] = bitcast <2 x i64> %b to <4 x i32>
; CHECK-NEXT: [[TMP3:%.*]] = select <4 x i1> %cmp, <4 x i32> [[TMP1]], <4 x i32> [[TMP2]]
; CHECK-NEXT: [[OR:%.*]] = bitcast <4 x i32> [[TMP3]] to <2 x i64>
; CHECK-NEXT: ret <2 x i64> [[OR]]
;
%sext = sext <4 x i1> %cmp to <4 x i32>
%t2 = bitcast <4 x i32> %sext to <2 x i64>
%and = and <2 x i64> %t2, %a
%neg = xor <4 x i32> %sext, <i32 -1, i32 -1, i32 -1, i32 -1>
%neg2 = bitcast <4 x i32> %neg to <2 x i64>
%and2 = and <2 x i64> %neg2, %b
%or = or <2 x i64> %and2, %and
ret <2 x i64> %or
}
define <2 x i64> @bitcast_select_swap_and_ops(<4 x i1> %cmp, <2 x i64> %a, <2 x i64> %b) {
; CHECK-LABEL: @bitcast_select_swap_and_ops(
; CHECK-NEXT: [[TMP1:%.*]] = bitcast <2 x i64> %a to <4 x i32>
; CHECK-NEXT: [[TMP2:%.*]] = bitcast <2 x i64> %b to <4 x i32>
; CHECK-NEXT: [[TMP3:%.*]] = select <4 x i1> %cmp, <4 x i32> [[TMP1]], <4 x i32> [[TMP2]]
; CHECK-NEXT: [[OR:%.*]] = bitcast <4 x i32> [[TMP3]] to <2 x i64>
; CHECK-NEXT: ret <2 x i64> [[OR]]
;
%sext = sext <4 x i1> %cmp to <4 x i32>
%t2 = bitcast <4 x i32> %sext to <2 x i64>
%and = and <2 x i64> %t2, %a
%neg = xor <4 x i32> %sext, <i32 -1, i32 -1, i32 -1, i32 -1>
%neg2 = bitcast <4 x i32> %neg to <2 x i64>
%and2 = and <2 x i64> %b, %neg2
%or = or <2 x i64> %and, %and2
ret <2 x i64> %or
}
define <2 x i64> @bitcast_select_swap_and_ops2(<4 x i1> %cmp, <2 x i64> %a, <2 x i64> %b) {
; CHECK-LABEL: @bitcast_select_swap_and_ops2(
; CHECK-NEXT: [[TMP1:%.*]] = bitcast <2 x i64> %a to <4 x i32>
; CHECK-NEXT: [[TMP2:%.*]] = bitcast <2 x i64> %b to <4 x i32>
; CHECK-NEXT: [[TMP3:%.*]] = select <4 x i1> %cmp, <4 x i32> [[TMP1]], <4 x i32> [[TMP2]]
; CHECK-NEXT: [[OR:%.*]] = bitcast <4 x i32> [[TMP3]] to <2 x i64>
; CHECK-NEXT: ret <2 x i64> [[OR]]
;
%sext = sext <4 x i1> %cmp to <4 x i32>
%t2 = bitcast <4 x i32> %sext to <2 x i64>
%and = and <2 x i64> %a, %t2
%neg = xor <4 x i32> %sext, <i32 -1, i32 -1, i32 -1, i32 -1>
%neg2 = bitcast <4 x i32> %neg to <2 x i64>
%and2 = and <2 x i64> %neg2, %b
%or = or <2 x i64> %and, %and2
ret <2 x i64> %or
}
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