13ffde316a
Remove compares after replacing all uses. Cleaning dead compares can enable additional simplifications when adjusting the position of the pass slightly. In particular, it seems like the additional dead instructions may prevent SimplifyCFG performing some folds. Reviewed By: nikic Differential Revision: https://reviews.llvm.org/D158760
152 lines
4.6 KiB
LLVM
152 lines
4.6 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
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; RUN: opt -passes=constraint-elimination -S %s | FileCheck %s
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declare void @llvm.assume(i1)
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define i1 @sge_0_unsigned_a_ne_0(i8 %a) {
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; CHECK-LABEL: @sge_0_unsigned_a_ne_0(
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; CHECK-NEXT: [[A_NE_0:%.*]] = icmp ne i8 [[A:%.*]], 0
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; CHECK-NEXT: call void @llvm.assume(i1 [[A_NE_0]])
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; CHECK-NEXT: [[EXT:%.*]] = zext i8 [[A]] to i16
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; CHECK-NEXT: ret i1 true
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;
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%a.ne.0 = icmp ne i8 %a, 0
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call void @llvm.assume(i1 %a.ne.0)
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%ext = zext i8 %a to i16
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%t = icmp sge i16 %ext, 0
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ret i1 %t
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}
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define i1 @sgt_0_unsigned_a_ne_0(i8 %a) {
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; CHECK-LABEL: @sgt_0_unsigned_a_ne_0(
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; CHECK-NEXT: [[A_NE_0:%.*]] = icmp ne i8 [[A:%.*]], 0
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; CHECK-NEXT: call void @llvm.assume(i1 [[A_NE_0]])
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; CHECK-NEXT: [[EXT:%.*]] = zext i8 [[A]] to i16
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; CHECK-NEXT: ret i1 true
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;
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%a.ne.0 = icmp ne i8 %a, 0
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call void @llvm.assume(i1 %a.ne.0)
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%ext = zext i8 %a to i16
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%t = icmp sgt i16 %ext, 0
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ret i1 %t
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}
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define i1 @sgt_0_unsigned_a_sgt_0(i8 %a) {
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; CHECK-LABEL: @sgt_0_unsigned_a_sgt_0(
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; CHECK-NEXT: [[A_SGT_0:%.*]] = icmp sgt i8 [[A:%.*]], 0
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; CHECK-NEXT: call void @llvm.assume(i1 [[A_SGT_0]])
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; CHECK-NEXT: [[EXT:%.*]] = zext i8 [[A]] to i16
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; CHECK-NEXT: ret i1 true
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;
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%a.sgt.0 = icmp sgt i8 %a, 0
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call void @llvm.assume(i1 %a.sgt.0)
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%ext = zext i8 %a to i16
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%t = icmp sgt i16 %ext, 0
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ret i1 %t
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}
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define i1 @sge_0_unsigned_a_sge_0(i8 %a) {
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; CHECK-LABEL: @sge_0_unsigned_a_sge_0(
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; CHECK-NEXT: [[A_SGE_0:%.*]] = icmp sge i8 [[A:%.*]], 0
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; CHECK-NEXT: call void @llvm.assume(i1 [[A_SGE_0]])
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; CHECK-NEXT: [[EXT:%.*]] = zext i8 [[A]] to i16
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; CHECK-NEXT: ret i1 true
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;
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%a.sge.0 = icmp sge i8 %a, 0
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call void @llvm.assume(i1 %a.sge.0)
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%ext = zext i8 %a to i16
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%t = icmp sge i16 %ext, 0
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ret i1 %t
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}
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define i1 @sgt_0_unsigned_a_ugt_0(i8 %a) {
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; CHECK-LABEL: @sgt_0_unsigned_a_ugt_0(
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; CHECK-NEXT: [[A_UGT_0:%.*]] = icmp ugt i8 [[A:%.*]], 0
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; CHECK-NEXT: call void @llvm.assume(i1 [[A_UGT_0]])
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; CHECK-NEXT: [[EXT:%.*]] = zext i8 [[A]] to i16
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; CHECK-NEXT: ret i1 true
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;
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%a.ugt.0 = icmp ugt i8 %a, 0
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call void @llvm.assume(i1 %a.ugt.0)
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%ext = zext i8 %a to i16
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%t = icmp sgt i16 %ext, 0
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ret i1 %t
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}
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define i1 @sgt_1_unsigned_a_ne_0(i8 %a) {
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; CHECK-LABEL: @sgt_1_unsigned_a_ne_0(
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; CHECK-NEXT: [[A_NE_0:%.*]] = icmp ne i8 [[A:%.*]], 0
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; CHECK-NEXT: call void @llvm.assume(i1 [[A_NE_0]])
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; CHECK-NEXT: [[EXT:%.*]] = zext i8 [[A]] to i16
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; CHECK-NEXT: [[CMP:%.*]] = icmp sgt i16 [[EXT]], 1
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; CHECK-NEXT: ret i1 [[CMP]]
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;
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%a.ne.0 = icmp ne i8 %a, 0
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call void @llvm.assume(i1 %a.ne.0)
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%ext = zext i8 %a to i16
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%cmp = icmp sgt i16 %ext, 1
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ret i1 %cmp
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}
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define i1 @sgt_1_unsigned_a_ugt_1(i8 %a) {
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; CHECK-LABEL: @sgt_1_unsigned_a_ugt_1(
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; CHECK-NEXT: [[A_UGT_1:%.*]] = icmp ugt i8 [[A:%.*]], 1
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; CHECK-NEXT: call void @llvm.assume(i1 [[A_UGT_1]])
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; CHECK-NEXT: [[EXT:%.*]] = zext i8 [[A]] to i16
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; CHECK-NEXT: ret i1 true
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;
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%a.ugt.1 = icmp ugt i8 %a, 1
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call void @llvm.assume(i1 %a.ugt.1)
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%ext = zext i8 %a to i16
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%t = icmp sgt i16 %ext, 1
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ret i1 %t
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}
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define i1 @sge_no_const_unsigned_uge(i8 %a, i16 %b) {
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; CHECK-LABEL: @sge_no_const_unsigned_uge(
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; CHECK-NEXT: [[EXT:%.*]] = zext i8 [[A:%.*]] to i16
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; CHECK-NEXT: [[A_UGE_B:%.*]] = icmp uge i16 [[EXT]], [[B:%.*]]
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; CHECK-NEXT: call void @llvm.assume(i1 [[A_UGE_B]])
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; CHECK-NEXT: [[B_POS:%.*]] = icmp sge i16 [[B]], 0
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; CHECK-NEXT: call void @llvm.assume(i1 [[B_POS]])
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; CHECK-NEXT: [[CMP:%.*]] = icmp sge i16 [[EXT]], [[B]]
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; CHECK-NEXT: ret i1 [[CMP]]
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;
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%ext = zext i8 %a to i16
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%a.uge.b = icmp uge i16 %ext, %b
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call void @llvm.assume(i1 %a.uge.b)
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%b.pos = icmp sge i16 %b, 0
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call void @llvm.assume(i1 %b.pos)
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%cmp = icmp sge i16 %ext, %b
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ret i1 %cmp
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}
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define i1 @sgt_0_unsigned_a_ugt_neg_10(i8 %a) {
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; CHECK-LABEL: @sgt_0_unsigned_a_ugt_neg_10(
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; CHECK-NEXT: [[A_UGT_0:%.*]] = icmp ugt i8 [[A:%.*]], 10
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; CHECK-NEXT: call void @llvm.assume(i1 [[A_UGT_0]])
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; CHECK-NEXT: [[EXT:%.*]] = zext i8 [[A]] to i16
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; CHECK-NEXT: ret i1 true
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;
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%a.ugt.0 = icmp ugt i8 %a, 10
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call void @llvm.assume(i1 %a.ugt.0)
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%ext = zext i8 %a to i16
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%cmp = icmp sgt i16 %ext, 0
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ret i1 %cmp
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}
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define i1 @sge_neg_1_sge_0_known(i8 %a) {
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; CHECK-LABEL: @sge_neg_1_sge_0_known(
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; CHECK-NEXT: [[EXT:%.*]] = zext i8 [[A:%.*]] to i16
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; CHECK-NEXT: [[A_NE_0:%.*]] = icmp sge i16 [[EXT]], 0
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; CHECK-NEXT: call void @llvm.assume(i1 [[A_NE_0]])
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; CHECK-NEXT: ret i1 true
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;
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%ext = zext i8 %a to i16
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%a.ne.0 = icmp sge i16 %ext, 0
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call void @llvm.assume(i1 %a.ne.0)
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%t = icmp sge i16 %ext, -1
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ret i1 %t
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}
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