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llvm-6502/test/CodeGen/X86/ragreedy-last-chance-recoloring.ll
Hal Finkel d3aa46a1bc [MiSched] Fix a logic error in tryPressure() 
Fixes a logic error in the MachineScheduler found by Steve Montgomery (and
confirmed by Andy). This has gone unfixed for months because the fix has been
found to introduce some small performance regressions. However, Andy has
recommended that, at this point, we fix this to avoid further dependence on the
incorrect behavior (and then follow-up separately on any regressions), and I
agree.

Fixes PR18883.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@219512 91177308-0d34-0410-b5e6-96231b3b80d8
2014-10-10 17:06:20 +00:00

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; RUN: llc -regalloc=greedy -relocation-model=pic < %s 2>&1 | FileCheck %s
; Without the last chance recoloring, this test fails with:
; "ran out of registers".
; NOTE: With the fix to PR18883, we don't actually run out of registers here
; any more, and so those checks are disabled. This test remains only for general coverage.
; XXX: not llc -regalloc=greedy -relocation-model=pic -lcr-max-depth=0 < %s 2>&1 | FileCheck %s --check-prefix=CHECK-DEPTH
; Test whether failure due to cutoff for depth is reported
; XXX: not llc -regalloc=greedy -relocation-model=pic -lcr-max-interf=1 < %s 2>&1 | FileCheck %s --check-prefix=CHECK-INTERF
; Test whether failure due to cutoff for interference is reported
; RUN: llc -regalloc=greedy -relocation-model=pic -lcr-max-interf=1 -lcr-max-depth=0 -exhaustive-register-search < %s > %t 2>&1
; RUN: FileCheck --input-file=%t %s --check-prefix=CHECK-EXHAUSTIVE
; Test whether exhaustive-register-search can bypass the depth and interference cutoffs of last chance recoloring
target datalayout = "e-p:32:32:32-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:32:64-f32:32:32-f64:32:64-v64:64:64-v128:128:128-a0:0:64-f80:128:128-n8:16:32-S128"
target triple = "i386-apple-macosx"
@fp_dh_36985b17790d59a27994eaab5dcb00ee = external constant [499 x i32]
@fp_dh_18716afa4a5354de0a302c8edb3b0ee1 = external global i32
@fp_dh_20a33cdeefab8f4c8887e82766cb9dcb = external global i8*
@fp_dh_9d93c897906e39883c58b034c8e786b2 = external global [5419648 x i8], align 16
; Function Attrs: nounwind ssp
; CHECK-NOT: ran out of registers during register allocation
; CHECK-INTERF: error: register allocation failed: maximum interference for recoloring reached
; CHECK-DEPTH: error: register allocation failed: maximum depth for recoloring reached
; CHECK-EXHAUSTIVE-NOT: error: register allocation failed: maximum {{depth|interference}} for recoloring reached
define void @fp_dh_f870bf31fd8ffe068450366e3f05389a(i8* %arg) #0 {
bb:
indirectbr i8* undef, [label %bb85, label %bb206]
bb85: ; preds = %bb222, %bb85, %bb
store i8* blockaddress(@fp_dh_f870bf31fd8ffe068450366e3f05389a, %bb206), i8** undef, align 4
indirectbr i8* undef, [label %bb439, label %bb85]
bb206: ; preds = %bb
%tmp = getelementptr [499 x i32]* @fp_dh_36985b17790d59a27994eaab5dcb00ee, i32 0, i32 undef
%tmp207 = load i32* %tmp
%tmp208 = add i32 %tmp207, 1
%tmp209 = inttoptr i32 %tmp208 to i8*
indirectbr i8* %tmp209, [label %bb213]
bb213: ; preds = %bb206
%tmp214 = load i32* @fp_dh_18716afa4a5354de0a302c8edb3b0ee1, align 4
%tmp215 = load i8** @fp_dh_20a33cdeefab8f4c8887e82766cb9dcb, align 4
%tmp216 = urem i32 -717428541, %tmp214
%tmp217 = getelementptr i8* %tmp215, i32 %tmp216
%tmp218 = bitcast i8* %tmp217 to i32*
%tmp219 = load i32* %tmp218, align 4
store i32 %tmp219, i32* undef, align 4
%tmp220 = select i1 false, i32 359373646, i32 1677237955
%tmp221 = add i32 %tmp220, 0
indirectbr i8* undef, [label %bb432, label %bb222]
bb222: ; preds = %bb213
%tmp224 = load i32* undef, align 4
%tmp225 = load i32* undef, align 4
%tmp226 = xor i32 %tmp225, %tmp224
%tmp227 = shl i32 %tmp226, 1
%tmp228 = and i32 %tmp227, -2048880334
%tmp229 = sub i32 0, %tmp228
%tmp230 = add i32 0, %tmp229
%tmp231 = xor i32 %tmp230, 1059356227
%tmp232 = mul i32 %tmp231, 1603744721
%tmp233 = urem i32 %tmp232, 259
%tmp234 = getelementptr [259 x i8]* bitcast (i8* getelementptr inbounds ([5419648 x i8]* @fp_dh_9d93c897906e39883c58b034c8e786b2, i32 0, i32 2039075) to [259 x i8]*), i32 0, i32 %tmp233
%tmp235 = load i8* %tmp234, align 1
%tmp236 = add i32 %tmp233, 2
%tmp237 = getelementptr [264 x i8]* bitcast (i8* getelementptr inbounds ([5419648 x i8]* @fp_dh_9d93c897906e39883c58b034c8e786b2, i32 0, i32 3388166) to [264 x i8]*), i32 0, i32 %tmp236
%tmp238 = load i8* %tmp237, align 1
%tmp239 = getelementptr [265 x i8]* bitcast (i8* getelementptr inbounds ([5419648 x i8]* @fp_dh_9d93c897906e39883c58b034c8e786b2, i32 0, i32 1325165) to [265 x i8]*), i32 0, i32 0
%tmp240 = load i8* %tmp239, align 1
%tmp241 = add i32 %tmp233, 6
%tmp242 = trunc i32 %tmp241 to i8
%tmp243 = mul i8 %tmp242, -3
%tmp244 = add i8 %tmp243, 3
%tmp245 = mul i8 %tmp242, -6
%tmp246 = and i8 %tmp245, 6
%tmp247 = sub i8 0, %tmp246
%tmp248 = add i8 %tmp244, %tmp247
%tmp249 = load i8* undef, align 1
%tmp250 = xor i8 %tmp235, 17
%tmp251 = xor i8 %tmp250, %tmp238
%tmp252 = xor i8 %tmp251, %tmp240
%tmp253 = xor i8 %tmp252, %tmp249
%tmp254 = xor i8 %tmp253, %tmp248
%tmp255 = zext i8 %tmp254 to i16
%tmp256 = shl nuw i16 %tmp255, 8
%tmp257 = load i8* null, align 1
%tmp258 = load i32* @fp_dh_18716afa4a5354de0a302c8edb3b0ee1, align 4
%tmp259 = load i8** @fp_dh_20a33cdeefab8f4c8887e82766cb9dcb, align 4
%tmp260 = urem i32 -717428541, %tmp258
%tmp261 = getelementptr i8* %tmp259, i32 %tmp260
%tmp262 = bitcast i8* %tmp261 to i32*
%tmp263 = load i32* %tmp262, align 4
%tmp264 = xor i32 %tmp263, 0
%tmp265 = shl i32 %tmp264, 1
%tmp266 = and i32 %tmp265, -1312119832
%tmp267 = sub i32 0, %tmp266
%tmp268 = add i32 0, %tmp267
%tmp269 = xor i32 %tmp268, 623994670
%tmp270 = mul i32 %tmp269, 1603744721
%tmp271 = urem i32 %tmp270, 259
%tmp274 = add i32 %tmp271, 3
%tmp275 = getelementptr [265 x i8]* bitcast (i8* getelementptr inbounds ([5419648 x i8]* @fp_dh_9d93c897906e39883c58b034c8e786b2, i32 0, i32 1325165) to [265 x i8]*), i32 0, i32 %tmp274
%tmp276 = load i8* %tmp275, align 1
%tmp277 = add i32 %tmp271, 6
%tmp278 = trunc i32 %tmp277 to i8
%tmp279 = mul i8 %tmp278, -3
%tmp280 = add i8 %tmp279, 31
%tmp281 = add i8 %tmp280, 0
%tmp282 = xor i8 %tmp257, 13
%tmp283 = xor i8 %tmp282, 0
%tmp284 = xor i8 %tmp283, 0
%tmp285 = xor i8 %tmp284, %tmp276
%tmp286 = xor i8 %tmp285, %tmp281
%tmp287 = zext i8 %tmp286 to i16
%tmp288 = or i16 %tmp287, %tmp256
%tmp289 = xor i16 %tmp288, 14330
%tmp290 = add i16 0, %tmp289
%tmp291 = add i16 %tmp290, -14330
%tmp292 = zext i16 %tmp291 to i32
%tmp293 = add i16 %tmp290, -14330
%tmp294 = lshr i16 %tmp293, 12
%tmp295 = zext i16 %tmp294 to i32
%tmp296 = sub i32 0, %tmp295
%tmp297 = xor i32 %tmp296, 16
%tmp298 = add i32 0, %tmp297
%tmp299 = and i32 %tmp298, 31
%tmp300 = and i32 %tmp292, 30864
%tmp301 = shl i32 %tmp300, %tmp299
%tmp302 = xor i32 0, %tmp301
%tmp303 = add i32 0, %tmp302
%tmp304 = and i32 %tmp298, 31
%tmp305 = and i32 %tmp303, 25568
%tmp306 = lshr i32 %tmp305, %tmp304
%tmp307 = xor i32 0, %tmp306
%tmp308 = add i32 0, %tmp307
%tmp309 = trunc i32 %tmp308 to i16
%tmp310 = shl i16 %tmp309, 1
%tmp311 = and i16 %tmp310, -4648
%tmp312 = shl i16 %tmp309, 1
%tmp313 = and i16 %tmp312, 4646
%tmp314 = xor i16 %tmp311, 17700
%tmp315 = xor i16 %tmp313, 17700
%tmp316 = add i16 %tmp314, %tmp315
%tmp317 = and i16 %tmp314, %tmp315
%tmp318 = shl nuw i16 %tmp317, 1
%tmp319 = sub i16 0, %tmp318
%tmp320 = add i16 %tmp316, %tmp319
%tmp321 = and i16 %tmp320, 29906
%tmp322 = xor i16 %tmp309, 14953
%tmp323 = add i16 0, %tmp322
%tmp324 = sub i16 0, %tmp321
%tmp325 = xor i16 %tmp324, %tmp323
%tmp326 = add i16 0, %tmp325
%tmp327 = add i32 %tmp221, 1161362661
%tmp333 = icmp eq i16 %tmp326, 14953
%tmp334 = add i32 %tmp327, -1456704142
%tmp335 = zext i1 %tmp333 to i32
%tmp336 = add i32 %tmp334, %tmp335
%tmp337 = getelementptr [499 x i32]* @fp_dh_36985b17790d59a27994eaab5dcb00ee, i32 0, i32 %tmp336
%tmp338 = load i32* %tmp337
%tmp339 = add i32 %tmp338, 1
%tmp340 = inttoptr i32 %tmp339 to i8*
indirectbr i8* %tmp340, [label %bb85, label %bb439]
bb432: ; preds = %bb432, %bb213
%tmp433 = phi i32 [ %tmp221, %bb213 ], [ %tmp433, %bb432 ]
%tmp434 = add i32 %tmp433, 1022523279
%tmp435 = getelementptr [499 x i32]* @fp_dh_36985b17790d59a27994eaab5dcb00ee, i32 0, i32 %tmp434
%tmp436 = load i32* %tmp435
%tmp437 = add i32 %tmp436, 1
%tmp438 = inttoptr i32 %tmp437 to i8*
indirectbr i8* %tmp438, [label %bb432]
bb439: ; preds = %bb222, %bb85
ret void
}
attributes #0 = { nounwind ssp "less-precise-fpmad"="false" "no-frame-pointer-elim"="true" "no-frame-pointer-elim-non-leaf" "no-infs-fp-math"="false" "no-nans-fp-math"="false" "stack-protector-buffer-size"="8" "unsafe-fp-math"="false" "use-soft-float"="false" }
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