diff options
Diffstat (limited to 'test/Transforms/SimplifyCFG/X86/switch_to_lookup_table.ll')
| -rw-r--r-- | test/Transforms/SimplifyCFG/X86/switch_to_lookup_table.ll | 115 |
1 files changed, 110 insertions, 5 deletions
diff --git a/test/Transforms/SimplifyCFG/X86/switch_to_lookup_table.ll b/test/Transforms/SimplifyCFG/X86/switch_to_lookup_table.ll index 51ced40..fc22e7e 100644 --- a/test/Transforms/SimplifyCFG/X86/switch_to_lookup_table.ll +++ b/test/Transforms/SimplifyCFG/X86/switch_to_lookup_table.ll @@ -856,10 +856,10 @@ return: ; CHECK: entry: ; CHECK: br i1 %{{.*}}, label %switch.hole_check, label %sw.default ; CHECK: switch.hole_check: -; CHECK-NEXT: %switch.maskindex = trunc i32 %switch.tableidx to i6 -; CHECK-NEXT: %switch.shifted = lshr i6 -17, %switch.maskindex +; CHECK-NEXT: %switch.maskindex = trunc i32 %switch.tableidx to i8 +; CHECK-NEXT: %switch.shifted = lshr i8 47, %switch.maskindex ; The mask is binary 101111. -; CHECK-NEXT: %switch.lobit = trunc i6 %switch.shifted to i1 +; CHECK-NEXT: %switch.lobit = trunc i8 %switch.shifted to i1 ; CHECK-NEXT: br i1 %switch.lobit, label %switch.lookup, label %sw.default ; CHECK-NOT: switch i32 } @@ -895,7 +895,7 @@ sw.bb1: br label %return sw.bb2: br label %return sw.default: br label %return return: - %x = phi i32 [ 3, %sw.default ], [ 5, %sw.bb2 ], [ 7, %sw.bb1 ], [ 9, %entry ] + %x = phi i32 [ 3, %sw.default ], [ 5, %sw.bb2 ], [ 7, %sw.bb1 ], [ 10, %entry ] ret i32 %x ; CHECK-LABEL: @threecases( ; CHECK-NOT: switch i32 @@ -915,8 +915,12 @@ return: %x = phi i32 [ 3, %sw.default ], [ 7, %sw.bb1 ], [ 9, %entry ] ret i32 %x ; CHECK-LABEL: @twocases( -; CHECK: switch i32 +; CHECK-NOT: switch i32 ; CHECK-NOT: @switch.table +; CHECK: %switch.selectcmp +; CHECK-NEXT: %switch.select +; CHECK-NEXT: %switch.selectcmp1 +; CHECK-NEXT: %switch.select2 } ; Don't build tables for switches with TLS variables. @@ -973,3 +977,104 @@ return: ; CHECK: switch i32 ; CHECK-NOT: @switch.table } + +; We can use linear mapping. +define i8 @linearmap1(i32 %c) { +entry: + switch i32 %c, label %sw.default [ + i32 10, label %return + i32 11, label %sw.bb1 + i32 12, label %sw.bb2 + i32 13, label %sw.bb3 + ] +sw.bb1: br label %return +sw.bb2: br label %return +sw.bb3: br label %return +sw.default: br label %return +return: + %x = phi i8 [ 3, %sw.default ], [ 3, %sw.bb3 ], [ 8, %sw.bb2 ], [ 13, %sw.bb1 ], [ 18, %entry ] + ret i8 %x +; CHECK-LABEL: @linearmap1( +; CHECK: entry: +; CHECK-NEXT: %switch.tableidx = sub i32 %c, 10 +; CHECK: switch.lookup: +; CHECK-NEXT: %switch.idx.cast = trunc i32 %switch.tableidx to i8 +; CHECK-NEXT: %switch.idx.mult = mul i8 %switch.idx.cast, -5 +; CHECK-NEXT: %switch.offset = add i8 %switch.idx.mult, 18 +; CHECK-NEXT: ret i8 %switch.offset +} + +; Linear mapping in a different configuration. +define i32 @linearmap2(i8 %c) { +entry: + switch i8 %c, label %sw.default [ + i8 -10, label %return + i8 -11, label %sw.bb1 + i8 -12, label %sw.bb2 + i8 -13, label %sw.bb3 + ] +sw.bb1: br label %return +sw.bb2: br label %return +sw.bb3: br label %return +sw.default: br label %return +return: + %x = phi i32 [ 3, %sw.default ], [ 18, %sw.bb3 ], [ 19, %sw.bb2 ], [ 20, %sw.bb1 ], [ 21, %entry ] + ret i32 %x +; CHECK-LABEL: @linearmap2( +; CHECK: entry: +; CHECK-NEXT: %switch.tableidx = sub i8 %c, -13 +; CHECK: switch.lookup: +; CHECK-NEXT: %switch.idx.cast = zext i8 %switch.tableidx to i32 +; CHECK-NEXT: %switch.offset = add i32 %switch.idx.cast, 18 +; CHECK-NEXT: ret i32 %switch.offset +} + +; Linear mapping with overflows. +define i8 @linearmap3(i32 %c) { +entry: + switch i32 %c, label %sw.default [ + i32 10, label %return + i32 11, label %sw.bb1 + i32 12, label %sw.bb2 + i32 13, label %sw.bb3 + ] +sw.bb1: br label %return +sw.bb2: br label %return +sw.bb3: br label %return +sw.default: br label %return +return: + %x = phi i8 [ 3, %sw.default ], [ 44, %sw.bb3 ], [ -56, %sw.bb2 ], [ 100, %sw.bb1 ], [ 0, %entry ] + ret i8 %x +; CHECK-LABEL: @linearmap3( +; CHECK: entry: +; CHECK-NEXT: %switch.tableidx = sub i32 %c, 10 +; CHECK: switch.lookup: +; CHECK-NEXT: %switch.idx.cast = trunc i32 %switch.tableidx to i8 +; CHECK-NEXT: %switch.idx.mult = mul i8 %switch.idx.cast, 100 +; CHECK-NEXT: ret i8 %switch.idx.mult +} + +; Linear mapping with with multiplier 1 and offset 0. +define i8 @linearmap4(i32 %c) { +entry: + switch i32 %c, label %sw.default [ + i32 -2, label %return + i32 -1, label %sw.bb1 + i32 0, label %sw.bb2 + i32 1, label %sw.bb3 + ] +sw.bb1: br label %return +sw.bb2: br label %return +sw.bb3: br label %return +sw.default: br label %return +return: + %x = phi i8 [ 3, %sw.default ], [ 3, %sw.bb3 ], [ 2, %sw.bb2 ], [ 1, %sw.bb1 ], [ 0, %entry ] + ret i8 %x +; CHECK-LABEL: @linearmap4( +; CHECK: entry: +; CHECK-NEXT: %switch.tableidx = sub i32 %c, -2 +; CHECK: switch.lookup: +; CHECK-NEXT: %switch.idx.cast = trunc i32 %switch.tableidx to i8 +; CHECK-NEXT: ret i8 %switch.idx.cast +} + |