1 ; RUN: llc < %s -mtriple=thumbv7-apple-darwin -mcpu=cortex-a9 | FileCheck %s --check-prefix=CHECK --check-prefix=CHECK-CORTEX 2 ; RUN: llc < %s -mtriple=thumbv7-apple-darwin -mcpu=swift | FileCheck %s --check-prefix=CHECK --check-prefix=CHECK-SWIFT 3 ; Avoid some 's' 16-bit instruction which partially update CPSR (and add false 4 ; dependency) when it isn't dependent on last CPSR defining instruction. 5 ; rdar://8928208 6 7 define i32 @t1(i32 %a, i32 %b, i32 %c, i32 %d) nounwind readnone { 8 entry: 9 ; CHECK-LABEL: t1: 10 ; CHECK-CORTEX: muls [[REG:(r[0-9]+)]], r3, r2 11 ; CHECK-CORTEX-NEXT: mul [[REG2:(r[0-9]+)]], r1, r0 12 ; CHECK-SWIFT: muls [[REG2:(r[0-9]+)]], r1, r0 13 ; CHECK-SWIFT-NEXT: mul [[REG:(r[0-9]+)]], r2, r3 14 ; CHECK-NEXT: muls r0, [[REG]], [[REG2]] 15 %0 = mul nsw i32 %a, %b 16 %1 = mul nsw i32 %c, %d 17 %2 = mul nsw i32 %0, %1 18 ret i32 %2 19 } 20 21 ; Avoid partial CPSR dependency via loop backedge. 22 ; rdar://10357570 23 define void @t2(i32* nocapture %ptr1, i32* %ptr2, i32 %c) nounwind { 24 entry: 25 ; CHECK-LABEL: t2: 26 br label %while.body 27 28 while.body: 29 ; CHECK: while.body 30 ; CHECK: mul r{{[0-9]+}} 31 ; CHECK-NOT: muls 32 %ptr1.addr.09 = phi i32* [ %add.ptr, %while.body ], [ %ptr1, %entry ] 33 %ptr2.addr.08 = phi i32* [ %incdec.ptr, %while.body ], [ %ptr2, %entry ] 34 %0 = load i32, i32* %ptr1.addr.09, align 4 35 %arrayidx1 = getelementptr inbounds i32, i32* %ptr1.addr.09, i32 1 36 %1 = load i32, i32* %arrayidx1, align 4 37 %arrayidx3 = getelementptr inbounds i32, i32* %ptr1.addr.09, i32 2 38 %2 = load i32, i32* %arrayidx3, align 4 39 %arrayidx4 = getelementptr inbounds i32, i32* %ptr1.addr.09, i32 3 40 %3 = load i32, i32* %arrayidx4, align 4 41 %add.ptr = getelementptr inbounds i32, i32* %ptr1.addr.09, i32 4 42 %mul = mul i32 %1, %0 43 %mul5 = mul i32 %mul, %2 44 %mul6 = mul i32 %mul5, %3 45 store i32 %mul6, i32* %ptr2.addr.08, align 4 46 %incdec.ptr = getelementptr inbounds i32, i32* %ptr2.addr.08, i32 -1 47 %tobool = icmp eq i32* %incdec.ptr, null 48 br i1 %tobool, label %while.end, label %while.body 49 50 while.end: 51 ret void 52 } 53 54 ; Allow partial CPSR dependency when code size is the priority. 55 ; rdar://12878928 56 define void @t3(i32* nocapture %ptr1, i32* %ptr2, i32 %c) nounwind minsize { 57 entry: 58 ; CHECK-LABEL: t3: 59 br label %while.body 60 61 while.body: 62 ; CHECK: while.body 63 ; CHECK: mul r{{[0-9]+}} 64 ; CHECK: muls 65 %ptr1.addr.09 = phi i32* [ %add.ptr, %while.body ], [ %ptr1, %entry ] 66 %ptr2.addr.08 = phi i32* [ %incdec.ptr, %while.body ], [ %ptr2, %entry ] 67 %0 = load i32, i32* %ptr1.addr.09, align 4 68 %arrayidx1 = getelementptr inbounds i32, i32* %ptr1.addr.09, i32 1 69 %1 = load i32, i32* %arrayidx1, align 4 70 %arrayidx3 = getelementptr inbounds i32, i32* %ptr1.addr.09, i32 2 71 %2 = load i32, i32* %arrayidx3, align 4 72 %arrayidx4 = getelementptr inbounds i32, i32* %ptr1.addr.09, i32 3 73 %3 = load i32, i32* %arrayidx4, align 4 74 %add.ptr = getelementptr inbounds i32, i32* %ptr1.addr.09, i32 4 75 %mul = mul i32 %1, %0 76 %mul5 = mul i32 %mul, %2 77 %mul6 = mul i32 %mul5, %3 78 store i32 %mul6, i32* %ptr2.addr.08, align 4 79 %incdec.ptr = getelementptr inbounds i32, i32* %ptr2.addr.08, i32 -1 80 %tobool = icmp eq i32* %incdec.ptr, null 81 br i1 %tobool, label %while.end, label %while.body 82 83 while.end: 84 ret void 85 } 86 87 ; Avoid producing tMOVi8 after a high-latency flag-setting operation. 88 ; <rdar://problem/13468102> 89 define void @t4(i32* nocapture %p, double* nocapture %q) { 90 entry: 91 ; CHECK: t4 92 ; CHECK: vmrs APSR_nzcv, fpscr 93 ; CHECK: if.then 94 ; CHECK-NOT: movs 95 %0 = load double, double* %q, align 4 96 %cmp = fcmp olt double %0, 1.000000e+01 97 %incdec.ptr1 = getelementptr inbounds i32, i32* %p, i32 1 98 br i1 %cmp, label %if.then, label %if.else 99 100 if.then: 101 store i32 7, i32* %p, align 4 102 %incdec.ptr2 = getelementptr inbounds i32, i32* %p, i32 2 103 store i32 8, i32* %incdec.ptr1, align 4 104 store i32 9, i32* %incdec.ptr2, align 4 105 br label %if.end 106 107 if.else: 108 store i32 3, i32* %p, align 4 109 %incdec.ptr5 = getelementptr inbounds i32, i32* %p, i32 2 110 store i32 5, i32* %incdec.ptr1, align 4 111 store i32 6, i32* %incdec.ptr5, align 4 112 br label %if.end 113 114 if.end: 115 ret void 116 } 117
